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New Directions in Quantum Information
from
Monday, April 1, 2019 (9:00 AM)
to
Friday, April 26, 2019 (6:00 PM)
Monday, April 1, 2019
9:00 AM
Breakfast
Breakfast
9:00 AM  10:00 AM
Room: 122:026
3:00 PM
Resource theory of POVMbased coherence

Dagmar Bruss
Resource theory of POVMbased coherence
Dagmar Bruss
3:00 PM  4:00 PM
Room: 122:026
Dagmar Bruss <br><br> Resource theory of POVMbased coherence<br><br> Quantum coherence is a fundamental feature of quantum mechanics and an underlying requirement for most quantum information tasks. In the resource theory of coherence, incoherent states are diagonal with respect to a fixed orthonormal basis, i.e., they can be seen as arising from a von Neumann measurement. Here, we introduce and study a generalization to a resource theory of coherence defined with respect to the most general quantum measurement, i.e., to an arbitrary positiveoperatorvalued measure (POVM). We establish POVMbased coherence measures and POVMincoherent operations which coincide for the case of von Neumann measurements with their counterparts in standard coherence theory. A semidefinite program allows to characterize interconversion properties of resource states. We exemplify our framework by means of the qubit trine POVM.
Tuesday, April 2, 2019
10:00 AM
Detection of quantum channel capacities with few local measurements

Chiara Machiavello
Detection of quantum channel capacities with few local measurements
Chiara Machiavello
10:00 AM  11:00 AM
Room: 122:026
Chiara Machiavello <br><br> Detection of quantum channel capacities with few local measurements <br><br> We propose a method to detect lower bounds to quantum capacities of a noisy quantum communication channel by means of few measurements and by avoiding full process tomography. We show how the procedure can be easily applied to any finite dimensional system and unknown noisy channels. We test its efficiency by studying its performance for most well known single qubit noisy channels, for the generalised Pauli channel in arbitrary finite dimension and for correlated Pauli and amplitude damping channels acting on two qubits.
3:00 PM
Oneshot Quantum Dense Coding

Aditi Sen De
Oneshot Quantum Dense Coding
Aditi Sen De
3:00 PM  4:00 PM
Room: 122:026
Aditi Sen De<br><br> Oneshot Quantum Dense Coding<br><br> I will discuss the scenario of oneshot classical information transmission between multiple senders and a single receiver deterministically, when they a priori share a multipartite quantum state – an attempt towards building a deterministic dense coding network. I will then introduce the concept of conclusive dense coding in which the sender uses a single copy of preshared entangled state with the receiver to send complete classical messages unambiguously.
Wednesday, April 3, 2019
10:00 AM
Quantum uncertainty relations: some further landscapes

Ujjwal Sen
Quantum uncertainty relations: some further landscapes
Ujjwal Sen
10:00 AM  11:00 AM
Room: 122:026
Ujjwal Sen <br><br> Quantum uncertainty relations: some further landscapes<br><br> We wish to discuss about two related topics. <br> Based on the statistical concept of the median, we will propose a quantum uncertainty relation between spreads of the position and momentum distributions of arbitrary quantum states. The relation will be universal, unlike that based on the mean and standard deviation, as the latter may become nonexistent or ineffective in certain cases. We will show that the medianbased one is not saturated for Gaussian distributions in position. <br> In the second part, we will propose a quantum uncertainty relation for arbitrary quantum states in terms of Lipschitz constants of the corresponding position and momentum probability distributions. The Lipschitz constant of a function may be considered to quantify the extent of fluctuations of that function, and is in general independent of its spread. We find that the product of the Lipschitz constants is greater than the inverse square of the Planck constant.
3:00 PM
High dimensional frequency bin entanglement applications

JeanMarc Merolla
High dimensional frequency bin entanglement applications
JeanMarc Merolla
3:00 PM  4:00 PM
Room: 122:026
JeanMarc Merolla<br><br> High dimensional frequency bin entanglement applications<br><br> The use of highdimensional entangled states is a key enabler for high capacity quantum communications and key distribution [Dad11,Bar08], quantum computation [Bar08], information processing [Kre14]. For the success of these quantum photonic applications [Ali16], high visibility quantum interference and high integration is essential. Among the different degrees of freedom of photons, timeenergy entangled photon pairs at telecommunication wavelengths allows the implementation of high visibility experiments and are especially well suited for integration with the current fiber optic infrastructure [Rog2016]. Many experiments exploits the concept of time bins, in which the photons are detected at discrete times [Dyn09], because the timebin entangled states are robust with respect to the decoherence over large distances. Since 2010 [Oli10,Oli12,Oli14] our group has introduced the concept of frequency bin entanglement and, for the first time, we have demonstrated Bell inequality violations using high frequency electrooptic phase modulation. Several groups [Luk17, Cap10, Ima2017, Kue17] have proposed different potential applications using the same phase modulation techniques. These new works encourage to further work on frequency bin entanglement, which is a promising candidate to consolidate information processing solutions based on quantum photonics technology. Indeed the frequency domain is attractive, because (i) the frequency domain is naturally of high dimensionality, and (ii) building blocks such as frequency entangled source, modulators and filters involved in the manipulation method can be integrated on chip. This is why the frequency degree of freedom in quantum photonic undoubtedly offers a promising platform for scalable and robust quantum information processing. In this contribution, we will report on the different frequency bin entanglement architectures we have implemented using standard Telecom optoelectronic devices such as electro optic phase modulators and filters. Proof of concept experiments will be presented demonstrating high reliability and high potentiality of the method. <br><br> [Ali16] O. Alibart et al., Journal of Optics 18, 104001 (2016). [Bar08] J T Barreiro, T C Wei, & P G Kwiat, P. G, Nature Physics, 4, 282286 (2008).<br> [Cap10] J. Capmany and C. R. FernandezPousa, J. Opt. Soc. Am., B 27, A119 (2010). <br> [Dyn09] F. Dynes,1, H. Takesue,Z. L. Yuan, A. W. Sharpe,1 K. Harada, T. Honjo, H. Kamada, O. Tadanaga, Y. Nishida, M. Asobe,& A. J. Shields, Opt. Express Vol. 17, 1144011449 (2009)<br> [Dad11] A C Dada, J Leach, G S Buller, M J Padgett, & E Andersson, Nature Physics 7, 677680 (2011). <br> [Ima2017] P.Imany, O. D. Odele, J. A. JaramilloVillegas, Daniel E. Leaird, and Andrew M. Weiner, arXiv:1709.05274v2 , 18 Sep 2017. <br> [Kre14] M Krenn, et al. Proceedings of National Academy of Sciences 111, 62436247 (2014).<br> [Kue17] M. Kues, C. Reimer, P. Roztocki1, L. Romero Cortés, S. Sciara, B. Wetzel, Y. Zhang, A. Cino, S. T. Chu, B. E. Little, D. J. Moss, L. Caspani, J. Azaña1 and R. Morandotti, Nature, 546, pp 622, 2017. <br> [Luk17] J. M. Lukens and P.Lougovski ,Optica, vol.4, No. 1 (2017). <br> [Oli10] L. Olislager, J. Cussey, A.T. Nguyen, Ph. Emplit, S. Massar, J. M. Merolla, and K. Phan Huy, Phys. Rev. A, 82,1, 013804, 2010. <br> [Oli12] L. Olislager, I. Mbodji, E. Woodhead, J. Cussey, L. Furfaro, P. Emplit, S. Massar, K. P. Huy and J. M. Merolla, New J. of Phys. 14, 043015, (2012). <br> [Oli14] L. Olislager, I. Mbodji, E. Woodhead, J. Cussey, L. Furfaro, P. Emplit, S. Massar, K. Phan Huy, J.M. Merolla, Phys.Rev. A, 89,5, 052323, 2014. [Rog2016] S. Rogers, D. Mulkey, X. Lu, W. C. Jiang and Qiang Lin, ACS Photonics, 3 (10), pp. 17541761, 2016
5:00 PM
Reception
Reception
5:00 PM  6:00 PM
Room: 122:026
Thursday, April 4, 2019
10:00 AM
Informationtheoretic aspects of the generalized amplitude damping channel

Mark Wilde
Informationtheoretic aspects of the generalized amplitude damping channel
Mark Wilde
10:00 AM  11:00 AM
Room: 122:026
Mark Wilde <br><br> Informationtheoretic aspects of the generalized amplitude damping channel<br><br> The generalized amplitude damping channel (GADC) is one of the sources of noise in superconductingcircuitbased quantum computing. It can be viewed as the qubit analogue of the bosonic thermal channel, and it thus can be used to model lossy processes in the presence of background noise for lowtemperature systems. In this work, we provide an informationtheoretic study of the GADC. We first determine the parameter range for which the GADC is entanglement breaking and the range for which it is antidegradable. We then establish several upper bounds on its classical, quantum, and private capacities. These bounds are based on dataprocessing inequalities and the uniform continuity of informationtheoretic quantities, as well as other techniques. We also establish upper bounds on the twoway assisted quantum and private capacities of the GADC ("twoway" meaning that public classical communication is available for free). These bounds are based on the squashed entanglement, and they are established by constructing particular squashing channels. We compare these bounds with the known max Rains information bound, the known mutual information bound, and another based on approximate covariance. For all capacities considered, we find that a large variety of stateoftheart techniques are useful in establishing bounds. <br><br> This is joint work with Sumeet Khatri (LSU) and Kunal Sharma (LSU). https://arxiv.org/abs/1903.07747
3:00 PM
Nordita and AlbaNova Colloquium (S Reddy)
Nordita and AlbaNova Colloquium (S Reddy)
3:00 PM  4:00 PM
Room: 122:026
Speaker:Sanjay Reddy (University of Washington) <br> <a href="https://agenda.albanova.se/conferenceDisplay.py? confId=6710">Link to further information</a>
Friday, April 5, 2019
10:00 AM
Fidelity in port based teleportation from irreducible representations of walled Brauer algebra

Michal Horodecki
Fidelity in port based teleportation from irreducible representations of walled Brauer algebra
Michal Horodecki
10:00 AM  11:00 AM
Room: 122:026
Port based teleportation is a varaiant of teleportation disovered by Ishizaka and Hiroshima, where state is transferred to the receiver without he need of unitary correction. Instead, Bob has several particles (ports) Alice sends to Bob message "which port" and Bob recevies the particle in that port. The fidelity is transmission is not equal to 1 but it can be made arbitrarily close to one, once the number of ports is increased. For qubits, fidelity was evaluate danalytically by use of SU(2) representation. Here I present development for higher dimension, where the problem can be recast in terms of socalled wall Brauer algebras. Based on joint work with Marek Mozrzymas, Michal Studzinski and Sergii Strelchuk
3:00 PM
General mapping of multiqudit entanglement conditions to nonseparability indicators for quantum optical fields

Marek Zukowski
General mapping of multiqudit entanglement conditions to nonseparability indicators for quantum optical fields
Marek Zukowski
3:00 PM  4:00 PM
Room: 122:026
We show that any multiqudit entanglement witness leads to a nonseparability indicator for quantum optical fields, which involves intensity correlation measurements and is useful for field states of undefined photon numbers. With the approach we get, e.g., necessary and sufficient conditions for intensity or intensityrates correlations to reveal polarization entanglement. We also derive separability conditions for experiments with mutually unbiased multiport interferometers. Within the standard detector inefficiency model these entanglement indicators work for any detection efficiencies. For specific cases, we show advantages of using local intensity rates rather than intensities. The approach with rates allows a mapping of Bell inequalities for qudits to ones for optical fields. Our results may find applications also in studies of nonclassicality of correlations in "macroscopic" manybody quantum systems of undefined or uncontrollable number of constituents. [arXiv:1903.03526 ]
Saturday, April 6, 2019
Sunday, April 7, 2019
Monday, April 8, 2019
9:30 AM
Breakfast
Breakfast
9:30 AM  10:30 AM
Room: 122:026
10:30 AM
Short talks
Short talks
10:30 AM  1:00 PM
Room: 122:026
Participants of the week who want to give short talks should contact the organizers during the morning breakfast. A short talk is max 10 minutes + questions, max 3 slides. Whiteboard talks are also welcome.
3:00 PM
Quantum heat transport by photons in superconducting circuits

Jukka Pekola
Quantum heat transport by photons in superconducting circuits
Jukka Pekola
3:00 PM  4:00 PM
Room: 122:026
I first review the physics and experimental status of quantized heat conductance in nanostructures. Then I move on to our recent experiments on photonic heat transport in superconducting quantum circuits, where different physics emerges depending on the hierarchy of various coupling strengths. I also present our recent observations of heat current rectification. Work done in collaboration with Bayan Karimi, Jorden Senior, Alberto Ronzani, Azat Gubaydullin, YuCheng Chang and Joonas Peltonen.
Tuesday, April 9, 2019
10:00 AM
Heat engines and batteries: two stories with lessons from quantum optics

Klaus Moelmer
Heat engines and batteries: two stories with lessons from quantum optics
Klaus Moelmer
10:00 AM  11:00 AM
Room: 122:026
Klaus Moelmer <br><br> Heat engines and batteries: two stories with lessons from quantum optics<br><br> We study a simple model of an autonomous heat engines using tools and methods from quantum optics to go beyond the master equation and steady state density matrix of the system. Heat and work are not state functions in classical thermodynamics. In the same way they are not observables of a quantum engine, but they are naturally defined and their fluctuations are readily calculated by the theory of measurements in quantum optics and the quantum regression theorem. <br> Collective effects and superadiance have been promoted as mechanisms leading to genuine quantum advantages in manybody heat engines and energy storage devices. We show that superradiant engines and batteries have a peculiar feature, which may be relevant for their practical use in experiments: They age. i.e., their output power and charging capacity decrease over time. Like household electronics, to regain their full capacity they should be fully discharged at frequent intervals.
3:00 PM
Interplay of dynamics and thermodynamics in nanoscale heat engines

Sai Vinjanampathy
Interplay of dynamics and thermodynamics in nanoscale heat engines
Sai Vinjanampathy
3:00 PM  4:00 PM
Room: 122:026
Classical synchronisation (unrelated to clock synchronisation) is the study of the mutual adjustment of rhythms of coupled nonlinear dynamical systems. Such dynamical systems exhibit a certain kind of stability known as the Arnold’s tongue. In this talk, i will discuss our recent study of the interplay of nonlinear dynamical effects and performance of nanoscale thermal machines.
Wednesday, April 10, 2019
10:00 AM
Generation of multipartite entangled states by an autonomous thermal machine

Jonathan Bohr Brask
Generation of multipartite entangled states by an autonomous thermal machine
Jonathan Bohr Brask
10:00 AM  11:00 AM
Room: 122:026
Jonatan Bohr Brask <br><br> Generation of multipartite entangled states by an autonomous thermal machine <br><br> Abstract: Entanglement is a key resource for quantum information processing, and generating and maintaining entanglement is therefore a central challenge. While entanglement is fragile and generally degrades under unavoidable interactions of a system with its environment, it has been realised that dissipation may in some cases aid the generation and stabilisation of entanglement. In particular, heat gradients present in a multipartite system interacting with multiple thermal baths can induce entanglement in a steady state out of thermal equilibrium. Here, we describe a thermal machine capable of generating a large class of highly entangled, multipartite states of qubits, including GHZ, W, and cluster states. Entanglement is obtained from the steady state of the machine in a heralded manner. Apart from the heralding step, the machine is fully autonomous, requiring only incoherent couplings to thermal baths and energypreserving, alwayson interactions between parts of the machine. The final heralding step needs only local, projective measurements, which do not by themselves generate any entanglement.
3:00 PM
Dynamically Induced Heat Rectification in Quantum Systems

Anna Sanpera Trigueros
Dynamically Induced Heat Rectification in Quantum Systems
Anna Sanpera Trigueros
3:00 PM  4:00 PM
Room: 122:026
Anna Sanpera Trigueros <br><br> Dynamically Induced Heat Rectification in Quantum Systems <br> <br> Heat rectifiers are systems that conduct heat asymmetrically for forward and reversed temperature gradients. We present an analytical study of heat rectification in linear quantum systems. We demonstrate that asymmetric heat currents can be induced in a linear system only if it is dynamically driven. This asymmetry emerges when the driving frequency favors the nonsymmetric heat exchange processes in front of the symmetric ones. Finally, we demonstrate the feasibility of such driven harmonic network to work as a thermal transistor, quantifying its efficiency through the dynamical amplification factor.
4:00 PM
Certifying the nonclassicality of fluctuations

Patrick Potts
Certifying the nonclassicality of fluctuations
Patrick Potts
4:00 PM  5:00 PM
Room: 122:026
Patrick Potts<br><br> Certifying the nonclassicality of fluctuations<br><br> Fluctuations have an important role in quantum thermodynamics. For instance, the output of a quantum thermal machine will in general be a fluctuating quantity. Due to the unavoidable measurement backaction in quantum mechanics, a measurement of multiple observables can in general not be described by a probability distribution that does not include the measurement apparatus explicitly. An example which has received considerable attention is provided by work fluctuations. In a classical scenario, a measurement might also act back on the measured system. However, this is in principle avoidable. Nevertheless, it is nontrivial to infer from measured data if the underlying observables can be described by a positive probability distribution or not. In this talk, I will show how one can rule out a description using only positive probability distributions (i.e., a classical description) by making a few natural assumptions on the measurement apparatus. This is achieved by obtaining an experimentally accessible inequality. In quantum theory, this inequality can be violated if and only if the Keldysh quasiprobabiliy distribution, a distribution that has been used before to describe work fluctuations, becomes negative. Importantly, all assumptions on the detectors can be fulfilled in quantum theory, allowing for the conclusion that the measured data cannot be obtained from any classical system.
5:00 PM
Reception
Reception
5:00 PM  6:00 PM
Room: 122:026
Thursday, April 11, 2019
10:00 AM
Quantum duets as autonomous thermal motors

Alberto Imparato
Quantum duets as autonomous thermal motors
Alberto Imparato
10:00 AM  11:00 AM
Room: 122:026
Alberto Imparato <br><br> Quantum duets as autonomous thermal motors<br><br> I will discuss how directed transport can emerge in twotemperature autonomous motors with broken spatial symmetry. <br> I will first consider the case of two quantum Brownian particles in contact with two heat baths at different temperatures and moving on shifted periodic potentials. The model exhibits a non vanishing centerofmass average velocity, as a consequence of the temperature gradient and of the broken spatial symmetry. Such velocity can be calculated exactly in the limit of small corrugation. This model represents the extension to the twotemperature case of the ”Quantum Brownian motion in a periodic potential“ considered in M. P. A. Fisher and W. Zwerger, Phys. Rev. B 32, 6190 (1985). I will then show that the Quantum Molecular Dynamics (QMD) numerical algorithm can be successfully used to evaluate the properties of such a non equilibrium, nonlinear system. <br> I will finally consider the discrete counterpart of the previous autonomous motor, composed of two 2D rotators that interact through the clock model Hamiltonian. In this case the dynamics is of Lindblad form, and one can derive an explicit formula for the probability current.
3:00 PM
Nordita and AlbaNova Colloquium (J Parrondo)
Nordita and AlbaNova Colloquium (J Parrondo)
3:00 PM  4:00 PM
Room: 122:026
Speaker: Juan MR Parrondo (Universidad Complutense de Madrid) <br> <a href="https://agenda.albanova.se/conferenceDisplay.py? confId=6706">Link to further information </a>
Friday, April 12, 2019
10:00 AM
Quantum Work and Energy Exchange from Quantum Trajectories and Conditional Wave Functions

Tapio AlaNissila
Quantum Work and Energy Exchange from Quantum Trajectories and Conditional Wave Functions
Tapio AlaNissila
10:00 AM  11:00 AM
Room: 122:026
I will discuss our recent efforts to circumvent the nogo theorem for quantum work [1] by using quantum trajectories from the HamiltonJacobi (Bohm) formalism. Quantum trajectories allow us to define work for a closed system that is in close analogy to the classical definition, and which recovers the standard results in the appropriate limits [2]. Time permitting I will also discuss how the concept of a conditional wave function can be used to calculate energy exchanges between strongly coupled quantum systems [3]. <br> 1. M. PerarnauLlobet, E. Bäumer, K. V. Hovhannisyan, M. Huber, and A. Acin, Phys. Rev. Lett. vol. 118, 070601 (2017).<br> 2. R. Sampaio et al., Phys. Rev. A vol. 97, 012131 (2018).<br> 3. R. Sampaio et al., arXiv:1809.03273.
Saturday, April 13, 2019
Sunday, April 14, 2019
Monday, April 15, 2019
9:30 AM
Breakfast
Breakfast
9:30 AM  10:30 AM
Room: 122:026
10:30 AM
Short talks
Short talks
10:30 AM  1:00 PM
Room: 122:026
3:00 PM
The covariance of physical laws in quantum reference frames

Caslav Brukner
The covariance of physical laws in quantum reference frames
Caslav Brukner
3:00 PM  4:00 PM
Room: 122:026
Every observation in physics is made with respect to a frame of reference. In practise, we use real physical systems as reference frames, and as such they obey quantum mechanical laws. I will introduce a general method to quantise reference frame transformations, which generalises the usual reference frame transformation to a "superposition of coordinate transformations". I will describe how states, measurements, and dynamical evolutions transform between different quantum reference frames. While entanglement and superposition will be shown to be framedependent features, the form of the dynamical physical laws (e.g. the Schrödinger equation) remain the same in all frames, which generalises the notion of covariance of physical laws to quantum reference frames. I will end with two applications of our results: a definition of the rest frame for a quantum particle in a superposition of velocities, and a resolution of an old problem of identifying the qubit for a relativistic spin particle.
Tuesday, April 16, 2019
10:00 AM
Autonomous thermal machine for amplification and control of energetic coherence

Juan Parrondo
Autonomous thermal machine for amplification and control of energetic coherence
Juan Parrondo
10:00 AM  11:00 AM
Room: 122:026
Juan Parrondo <br><br> Autonomous thermal machine for amplification and control of energetic coherence<br><br> We present a model for an autonomous quantum thermal machine comprised of two qubits that are capable of amplifying the coherence in a nondegenerate system by using only thermal resources. This novel method of coherent control allows for the interconversion between energy, both work and heat, and coherence. This model opens up new possibilities in the generation and manipulation of coherence by autonomous thermal machines.
3:00 PM
Entropy production in a small quantum system strongly coupling with an environment: computational experiments

Ryoichi Kawai
Entropy production in a small quantum system strongly coupling with an environment: computational experiments
Ryoichi Kawai
3:00 PM  4:00 PM
Room: 122:026
Many theoretical expressions of dissipation along nonequilibrium processes have been proposed. However, they have not been fully verified by experiments. Especially for systems strongly interacting with environments the connection between theoretical quantities and standard thermodynamic observables are not clear. We have developed a computer simulation based on a spinboson model, which is suitable for testing the proposed theories. Measuring the dissipation with conventional thermodynamic quantities, we check the deviation from the standard thermodynamic behavior presumably due to the strong coupling. Then, we attempt to construct empirical expressions that are consistent both with the experiments and the theories.
Wednesday, April 17, 2019
10:00 AM
Simple explanation of quantum nonlocality and contextuality

Adán Cabello
Simple explanation of quantum nonlocality and contextuality
Adán Cabello
10:00 AM  11:00 AM
Room: 122:026
Adán Cabello, University of Seville<br> Simple explanation of quantum nonlocality and contextuality <br> <br> Considerable efforts have been devoted searching the principle that explains why some forms of Bell nonlocality and KochenSpecker (KS) contextuality are possible and others are forbidden. Here, we show that the assumptions that statistically independent experiments exist and that every behavior that is not forbidden is compulsory, single out the same set of behaviors that quantum theory predicts for any Bell and KS contextuality scenario. As a byproduct, our result explains why the socalled almost quantum correlations for Bell scenarios are forbidden.
3:00 PM
Distributed private randomness distillation

Dong Yang
Distributed private randomness distillation
Dong Yang
3:00 PM  4:00 PM
Room: 122:026
Dong Yang, University of Bergen<br> Distributed private randomness distillation <br><br> We develop the resource theory of private randomness extraction in the distributed and device dependent scenario. We begin by introducing the notion of independent random bits, which are bipartite states containing ideal private randomness for each party, and motivate the natural set of free operations. As the main tool of our analysis, we introduce Virtual Quantum State Merging, which is essentially the flip side of Quantum State Merging, without communication. We focus on the bipartite case and find the rate regions achievable in different settings. Perhaps surprisingly, it turns out that local noise can boost randomness extraction. As a consequence of our analysis, we resolve a longstanding problem by giving an operational interpretation for the reverse coherent information in terms of the number of private random bits obtained by sending quantum states from one honest party (server) to another one (client) via the eavesdropped quantum channel.
4:00 PM
What is this program about?

Mohamed Bourennane
What is this program about?
Mohamed Bourennane
4:00 PM  5:00 PM
Room: 122:026
This is the event in the program where one of the organizers explains with a blackboard talk the main research scope and scientific challenges addressed by the program, aimed to PhD students who have just arrived at Nordita. <br> The event is open to all Nordita faculty, postdocs, students and staff, and will be followed by a reception and mingling event.
5:00 PM
Reception
Reception
5:00 PM  6:00 PM
Room: 122:026
Thursday, April 18, 2019
10:00 AM
Unscheduled
Unscheduled
10:00 AM  11:00 AM
Room: 122:026
Friday, April 19, 2019
Saturday, April 20, 2019
Sunday, April 21, 2019
Monday, April 22, 2019
Tuesday, April 23, 2019
9:30 AM
Breakfast
Breakfast
9:30 AM  10:30 AM
Room: 122:026
3:00 PM
The Future of Quantum Mechanics

Ingemar BENGTSSON
The Future of Quantum Mechanics
Ingemar BENGTSSON
3:00 PM  4:00 PM
Room: 122:026
I was asked to talk about the future. I don't know much about it, but I will discuss whether quantum mechanics will be superseded by a better theory in the future. Perhaps because this is needed to handle gravity? Or when the domain of application is extended in some other way? In retrospect it is easy to see that the formalism of classical mechanics has some features that point directly to quantum mechanics. Does the formalism of quantum mechanics have some features that point beyond it?'
4:00 PM
Why photon counting is great

Konrad Banaszek
Why photon counting is great
Konrad Banaszek
4:00 PM  5:00 PM
Room: 122:026
Konrad Banaszek <br><br> Why photon counting is great
Wednesday, April 24, 2019
10:00 AM
Large deviation methods in open quantum systems

Juan P. Garrahan
Large deviation methods in open quantum systems
Juan P. Garrahan
10:00 AM  11:00 AM
Room: 122:026
In this talk I will describe a perspective on the dynamics of Markovian open quantum systems based on the study of the statistical properties of ensembles of quantum trajectories. This "thermodynamics of quantum trajectories" approach is to dynamics what the standard equilibrium configuration ensemble method is for statics. Just like in the static case, this is based on the formalism of large deviations. I will go through the main ideas, and discuss applications to problems including trajectory phase transitions, how to optimally realise rare events, socalled predictionretrodiction, fluctuation bounds, and catching and reversing quantum jumps.
2:00 PM
SpacetoGround Quantum Key Distribution

Rupert Ursin
(
IQOQI  Vienna, Austrian Academy of Sciences
)
SpacetoGround Quantum Key Distribution
Rupert Ursin
(
IQOQI  Vienna, Austrian Academy of Sciences
)
2:00 PM  3:00 PM
Room: 122:026
Quantum key distribution (QKD) can in principle offer unconditional security by making use of the fundamental laws of quantum mechanics. In practice, this is typically achieved by preparing individual photons in quantum superposition states and sending them to a remote receiver. To date, most commercially available QKD systems rely on the transmission of the photons via optical fibers, which, due to channel loss and detector noise, limits the distance over which QKD is feasible to a few hundred kilometers. Alternatively, satellitebased QKD facilitates low photon loss and negligible signal disturbance and offers a viable solution for establishing a global scale quantum network. Recently, a quantum science mission of the Chinese Academy of Sciences (CAS) in collaboration with the Austrian Academy of Sciences (AAS) and the University of Vienna aimed at a satellitebased intercontinental quantumkey relay. Using the Chinese Quantum Science Satellite “Micius” as a trusted relay, a quantum network consisting of three optical ground stations located in China (Xinglong, Nanshan) and Austria (GrazLustbühel) has been demonstrated successfully. Here we report on the development of a quantum receiving module, installed at the Satellite Laser Ranging Station in Graz (Austria) capable of implementing the socalled decoystate QKD protocol in a downlink scenario from the LEO satellite “Micius”. Furthermore, we will present the experimental results obtained during several downlinks from the Chinese satellite focusing in particular on the performance of the Austrian receiving station.
3:00 PM
Rotating trapped fermions in 2d and the complex Ginibre ensemble

Satyanarayan Majumdar
Rotating trapped fermions in 2d and the complex Ginibre ensemble
Satyanarayan Majumdar
3:00 PM  4:00 PM
Room: 122:026
Satyanarayan Majumdar, LPTMS, Universite ParisSud, Orsay <br> Rotating trapped fermions in 2d and the complex Ginibre ensemble<br><br> We establish an exact mapping between the positions of N noninteracting fermions in a 2d rotating harmonic trap in its groundstate and the eigenvalues of the NxN complex Ginibre ensemble of Random Matrix Theory (RMT). Using RMT techniques, we make precise predictions for the statistics of the positions of the fermions, both in the bulk as well as at the edge of the trapped Fermi gas. In addition, we compute exactly, for any finite N, the Renyi entanglement entropy and the number variance of a disk of radius r in the groundstate. We show that while these two quantities are proportional to each other in the (extended) bulk, this is no longer the case very close to the trap center nor at the edge. Near the edge, and for large N, we provide exact expressions for the scaling functions associated with these two observables.
6:00 PM
Reception
Reception
6:00 PM  8:00 PM
Room: 122:026
Thursday, April 25, 2019
10:00 AM
Decoherence in the space of quantum operations: how to coherify a classical map?

Karol Zyczkowski
Decoherence in the space of quantum operations: how to coherify a classical map?
Karol Zyczkowski
10:00 AM  11:00 AM
Room: 122:026
Karol Zyczkowski <br><br> Decoherence in the space of quantum operations: how to coherify a classical map? <br><br> The theory of quantum information processing meets experiment: in view of the emerging field of quantum technologies future theoretical studies will be closer linked to the physical world by considering more realistic systems and putting even more emphasis on interaction of the system in question with environment and the effect of quantum decoherence. <br> In this talk I will shortly review the standard notion of decoherence and its formal inverse: <i>coherification</i> of a classical probability vector denotes the search of all its preimages with respect to the coarse graining channel, which induces the decoherence. <br> A similar problem can also be posed for channels: For a given classical map corresponding to a stochastic transition matrix <b>T</b> we look for quantum channel <b>Phi</b>, which induces the same classical transition matrix <b>T</b>, but is "more coherent". To quantify the coherence of a channel <b>Phi</b> we measure the coherence of the corresponding Jamiolkowski state <b>J</b>. We show that a classical transition matrix <b>T</b> can be <i> coherified</i> to a reversible unitary dynamics if and only if <b>T</b> is unistochastic. Otherwise the Jamiolkowski state <b>J</b> of the optimally coherified channel is mixed, and the dynamics must necessarily be irreversible. <br><br> References: <br> [1] K. Korzekwa, S. Czachorski, Z. Puchala and K. Zyczkowski, N.J.Phys. vol 20, 043028 (2018). <br> [2] K. Korzekwa, S. Czachorski, Z. Puchala and K. Zyczkowski, preprint arXiv:1812.09083
11:00 AM
The experiment paradox

Michał Eckstein
(
University of Gdańsk
)
The experiment paradox
Michał Eckstein
(
University of Gdańsk
)
11:00 AM  12:00 PM
Room: 122:026
The foundations of quantum mechanics are haunted by the notorious measurement paradox, caused by the invasive character of projective measurements. I will show that it is in fact an instance of the `experiment paradox' lurking in the very core of the scientific method. It turns out that any experiment performed on a physical system is  by necessity  invasive and thus establishes inevitable limits to the accuracy of any mathematical model. I will highlight the dramatic consequences of the paradox for both classical and quantum systems. The talk is based on a recent preprint with Pawel Horodecki: https://arxiv.org/abs/1904.04117
3:00 PM
Nordita and AlbaNova Colloquium (M Berry)
Nordita and AlbaNova Colloquium (M Berry)
3:00 PM  4:00 PM
Room: 122:026
Speaker: Michael Berry (H H Wills Physics Laboratory, University of Bristol, UK) <br> Title: Geometric phases and the separation of the world <br> <a href="https://agenda.albanova.se/conferenceDisplay.py? confId=6577">Link with more information</a>
Friday, April 26, 2019
10:00 AM
The power of quantum networks

Antonio Acin
The power of quantum networks
Antonio Acin
10:00 AM  11:00 AM
Room: 122:026
We discuss the power of current and nearfuture quantum networks for quantum information processing. We start in the classical regime and review the concept of causal networks, designed to understand when a given cause pattern is able to reproduce some observed correlations. We then move to the quantum case and explain how Bell’s theorem can be interpreted as a gap between the correlations observed in a network when using classical or quantum causes. We present other classicalquantum separations and discuss about their possible use for the design of novel quantum information protocols with no classical analogue.
11:00 AM
Quantum computation and the additional degrees of freedom in a physical system

JanÅke Larsson
(
Linköping University
)
Quantum computation and the additional degrees of freedom in a physical system
JanÅke Larsson
(
Linköping University
)
11:00 AM  12:00 PM
Room: 122:026
The speedup of Quantum Computers is the current drive of an entire scientific field with several large research programmes both in industry and academia worldwide. Many of these programmes are intended to build hardware for quantum computers. A related important goal is to understand the reason for quantum computational speedup; to understand what resources are provided by the quantum system used in quantum computation. Some candidates for such resources include superposition and interference, entanglement, nonlocality, contextuality, and the continuity of statespace. The standard approach to these issues is to restrict quantum mechanics and characterize the resources needed to restore the advantage. Our approach is dual to that, instead extending a classical information processing systems with additional properties in the form of additional degrees of freedom, normally only present in quantummechanical systems. In this talk, we will have a look at these additional degrees of freedom and how quantum computers make use of them to achieve the socalled quantum speedup. We will also discuss whether the additional degrees of freedom can be viewed as a ”side channel,” a term often seen in cryptology, and whether quantum parallelism rather should be viewed as computation performed in some additional degree of freedom.