Speaker
Prof.
Sorin Paraoanu
(Aalto)
Description
The adiabatic manipulation of quantum states is a powerful
technique from quantum optics and atomic physics. Previous
work on the Autler-Townes effect in superconducting phase
qutrits [1], on Stueckelberg interference [2], and on the
effect of motional averaging in transmons [3] has added
evidence that superconducting circuits truly behave as
controllable artificial atoms. Here we benchmark the
stimulated Raman adiabatic passage process for circuit
quantum electrodynamics, by using the first three levels of
a transmon qubit [4]. To realize this coherent transfer, we
use two adiabatic Gaussian-shaped control microwave pulses
coupled to the first and the second transition. In this
ladder configuration, we measure a population transfer
efficiency above 80% between the ground state and the second
excited state. The advantage of this technique is robustness
against errors in the timing of the control pulses. By doing
quantum tomography at successive moments during the Raman
pulses, we investigate the transfer of the population in
time-domain. We also show that this protocol can be reversed
by applying a third adiabatic pulse. Furthermore, we study
the effect of applying the adiabatic Raman sequence to a
superposition between the ground and the first excited
state, and we present experimental results for the case of a
quasi-degenerate intermediate level. The result is one step
towards the realization of holonomic quantum computing and
quantum simulators with superconducting circuits [5].
References:
[1] Mika A. Sillanpää, et. al., Phys. Rev. Lett. 103, (2009) 193601; Jian Li et. al., Phys. Rev. B 84, (2011) 104527; Jian Li et. al. , Sci. Rep. 2, 645 (2012).
[2] M.P. Silveri, K.S. Kumar, J. Tuorila, J. Li, A. Vepsäläinen, E.V. Thuneberg, G.S. Paraoanu, New J. Phys. 17, 043058 (2015).
[3] Jian Li, M. P. Silveri, K. S. Kumar, J.-M. Pirkkalainen, A. Vepsäläinen, W. C. Chien, J. Tuorila, M. A. Sillanpää, P. J. Hakonen, E. V. Thuneberg, G. S. Paraoanu, Nat. Commun. 4, 1420 (2013).
[4] K. S. Kumar, A. Vepsalainen, S. Danilin, G. S. Paraoanu, Nat. Commun. 7, 10628 (2016).
[5] G. S. Paraoanu, Recent progress in quantum simulation using superconducting circuits, J. Low. Temp. Phys. 175, 633-654 (2014) .
References:
[1] Mika A. Sillanpää, et. al., Phys. Rev. Lett. 103, (2009) 193601; Jian Li et. al., Phys. Rev. B 84, (2011) 104527; Jian Li et. al. , Sci. Rep. 2, 645 (2012).
[2] M.P. Silveri, K.S. Kumar, J. Tuorila, J. Li, A. Vepsäläinen, E.V. Thuneberg, G.S. Paraoanu, New J. Phys. 17, 043058 (2015).
[3] Jian Li, M. P. Silveri, K. S. Kumar, J.-M. Pirkkalainen, A. Vepsäläinen, W. C. Chien, J. Tuorila, M. A. Sillanpää, P. J. Hakonen, E. V. Thuneberg, G. S. Paraoanu, Nat. Commun. 4, 1420 (2013).
[4] K. S. Kumar, A. Vepsalainen, S. Danilin, G. S. Paraoanu, Nat. Commun. 7, 10628 (2016).
[5] G. S. Paraoanu, Recent progress in quantum simulation using superconducting circuits, J. Low. Temp. Phys. 175, 633-654 (2014) .
Primary author
Prof.
Sorin Paraoanu
(Aalto)
