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Sofia Qvarfort (Stockholm University)25/11/2025, 14:00
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Dr Magdalena Zych (Stockholm University)25/11/2025, 14:30
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Vaishali Adya25/11/2025, 15:30
Squeezed light technology has improved the sensitivity of precision measurement experiments ranging from gravitational wave detection to microscopy. Right from its conception in 1950’s to its implementation in the Laser Interferometer Gravitational-wave Observatory (LIGO), squeezed light generation has come a long way. In this talk today, I will discuss the principles of squeezed light...
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Dr Zoltán Zimborás (University of Helsinki)25/11/2025, 16:00
In this talk we present a range of results on several groups of broad interest in quantum information science: the Clifford group, the orthogonal group, the unitary symplectic groups, and the matchgate group. For all of these groups, we prove that analogues of unitary designs cannot be generated by any circuit ensemble with light-cones that are smaller than the system size. This implies linear...
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Dr Jose Lado (University of Aalto)26/11/2025, 09:30
Moiré and super-moiré materials provide exceptional platforms to engineer exotic correlated quantum matter. The vast number of sites required to model moiré systems in real space remains a formidable challenge due to the immense computational resources required. Super-moiré materials push this requirement to the limit, where millions or even billions of sites need to be considered, a...
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Dr Kimmo Luoma (University of Turku)26/11/2025, 10:00
In this talk i will present one possible approach to open quantum system dynamics which is based on solving the dynamics of both the system and the environment. I will present applications of this method to organic microcavity polaritons, quantum information and quantum measurement theory.
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Robert Fickler (University of Tampere)26/11/2025, 11:00
Structured light, i.e. light fields with a non-trivial shape in time, space, and polarization, has become a versatile approach to explore fundamental optics effects and develop novel applications in fields such as microscopy, imaging, optical communications, and quantum technologies, to name a few. In this talk, I will first introduce the field of structured light focusing on its applications...
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Nils Johan Engelsen (Chalmers)26/11/2025, 11:30
Nanomechanical oscillators are among the most sensitive force and acceleration sensors and show promise as a quantum technology. However, their performance is fundamentally limited by mechanical dissipation, which admits thermomechanical noise from the environment, limiting force sensitivity, and cuts down the coherence time of mechanical quantum states. Over the last decade, the phenomenon...
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26/11/2025, 14:00
Donor spins in silicon have been shown to have good single qubit properties but their scalability is still limited by the lack of convenient coupling and readout methods. One possibility to solve these issues would be to couple the spins to mechanical modes, which can then be used as both a coupling pathway between the qubits and a readout bus to optical telecom range photons, taking advantage...
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26/11/2025, 14:30
We develop an experimental platform for trapping and controlling the motion of sub-micron solid particles at the quantum level in ultra-high vacuum (UHV). By integrating a stable dark optical trap within the large RF potential of a Paul trap, we combine the strengths of both approaches and overcome key limitations of conventional bright optical trapping of large masses. We demonstrate trapping...
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Dr Fabio Costa (Nordita)26/11/2025, 15:30
The study of quantum causal structures brings insights into both foundational and applied aspect of quantum theory. Foundationally, it has been found that quantum theory can be formulated without assigning causal relations a priori. This provides the possibility to discover unknown causal relations and to model scenarios with indefinite causal order, which can arise in quantum-gravity...
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Daniel Franca26/11/2025, 16:00
Analog quantum simulators have scaled rapidly to sizes that challenge classical simulation, offering a pathway to solving complex many-body physics problems. However, a paradox remains: how can we verify the quantitative accuracy of a device built to surpass our own computational capabilities? Without error correction, these NISQ devices are prone to calibration errors and environmental noise,...
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26/11/2025, 17:00
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27/11/2025, 09:30
In this talk, I will present an overview of recent research developments from my group, covering three main directions: classical simulation of quantum computers, the resource theory of quantum computation, and the protection of quantum information using bosonic codes.
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A key challenge in the development of quantum computing architectures is the design of classical algorithms capable of... -
27/11/2025, 10:00
Light-matter interactions in time-varying materials have attracted significant interest recently, uncovering novel electromagnetic phenomena and offering enhanced functionalities of photonic devices. However, compared to the research efforts and progresses that have taken place in the classical context, the quantum aspects of this emerging subject have been less explored. Here, we study...
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27/11/2025, 11:00
My research as an Assistant Professor focuses on using rare-earth crystals for quantum technologies. These crystals exhibit unique properties, such as hour-long coherence times, optical integration, and high qubit densities, making them promising candidates for quantum computing and quantum communication. My vision is to develop a small-scale quantum processor that in the future can store...
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Dr Andrea Maiani (Nordita)27/11/2025, 11:30
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27/11/2025, 14:00
The interaction of high energy light with matter leads to the emission of electrons in a process known as photoionization. This process underpins numerous measurement techniques in atomic and molecular physics, and material science to study the structure and properties of matter.
Despite the inherently quantum nature of the photoionization process, existing photoelectron-based measurement...
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Teiko Heinosaari (University of Jyväskylä)27/11/2025, 14:30
Quantum guessing games provide a framework for analyzing how information encoded in quantum states can be optimally extracted through measurement. Beyond the standard role of side information, we introduce the concept of metainformation: knowledge that further side information of a certain type will later become available, even if it is not yet revealed. This distinction uncovers a finer...
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27/11/2025, 15:30
Limited qubit connectivity challenges practical deployment of quantum algorithms on quantum processors. When a gate between not-neighboring qubits is implemented, the qubit state must be moved to a nearby connected qubit for local execution, achieved typically through a series of SWAP operations and leading to increased circuit depth, gate count, and reduced total error performance.
This...
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27/11/2025, 16:00
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28/11/2025, 09:30
In private distributed sensing, multiple parties aim to collectively estimate a global function of local parameters while retaining privacy of the individual parameters. We introduce a new protocol for distributed phase sensing using continuous-variable quantum states and measurements. We consider a multipartite network in which each node encodes a local phase into a shared entangled Gaussian...
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28/11/2025, 10:00
Non-stabilizerness, or magic, is a key resource enabling quantum computers to outperform classical devices. Yet, characterizing and certifying this resource remains challenging due to the complex geometry of stabilizer polytopes and the lack of direct experimental witnesses. In this talk, we will discuss two complementary approaches connecting the resource theory of magic to operational...
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28/11/2025, 11:00
Selecting the architecture of a superconducting quantum processor requires making many design choices, sometimes trying to meet conflicting demands. In this talk, I will discuss the architectures we have developed and are exploring for our processors in the Wallenberg Centre for Quantum Technology, and the theory tools we use in that work. I will show how we use tunable couplers between...
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28/11/2025, 11:30
Many-body interactions can introduce entanglement between particles and hence are valuable resources for quantum information processing. After a brief introduction of quantum metrology, I will discuss a variational principle for controlling many-body quantum systems with restricted operations in the context of quantum sensing. We show that in a spin chain model containing three-body...
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