Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: Quantum Coherence, Quantum Information Systems 2

TT 42.11: Talk

Wednesday, March 13, 2013, 18:15–18:30, H18

Quantum process tomography of phase and energy relaxation through adaptive measurements — •Markku Stenberg¹ and Frank Wilhelm^1,2 — ¹Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany — ²Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada

Quantum process tomography tends to be very time consuming when multiple degrees of freedom are studied simultaneously. We present a method of efficient quantum process tomography to estimate the phase and energy relaxation rates in qubits. The method applies Bayesian inference to adaptively choose measurements based on the previously obtained measurement outcomes. We adopt sequential Monte-Carlo approach to perform the Bayesian updates and make use of a fast numerical implementation of the algorithm. We compare the performance of our method to conventional offline (implemented after experimental data collection) strategies and illustrate how our method can speed up quantum process tomography.