Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing

Nature Communications
Q FicheuxB Huard

Abstract

Decoherence originates from the leakage of quantum information into external degrees of freedom. For a qubit, the two main decoherence channels are relaxation and dephasing. Here, we report an experiment on a superconducting qubit where we retrieve part of the lost information in both of these channels. We demonstrate that raw averaging the corresponding measurement records provides a full quantum tomography of the qubit state where all three components of the effective spin-1/2 are simultaneously measured. From single realizations of the experiment, it is possible to infer the quantum trajectories followed by the qubit state conditioned on relaxation and/or dephasing channels. The incompatibility between these quantum measurements of the qubit leads to observable consequences in the statistics of quantum states. The high level of controllability of superconducting circuits enables us to explore many regimes from the Zeno effect to underdamped Rabi oscillations depending on the relative strengths of driving, dephasing, and relaxation.

References

Aug 8, 2009·Physical Review Letters·Mankei Tsang
Jan 12, 2013·Science·M HatridgeM H Devoret
Nov 5, 2013·Physical Review Letters·Søren GammelmarkKlaus Mølmer
May 27, 2014·Physical Review Letters·P Campagne-IbarcqB Huard
Aug 1, 2014·Nature·S J WeberI Siddiqi
Mar 21, 2015·Physical Review Letters·D TanK W Murch
Nov 14, 2015·Physical Review Letters·Ivonne Guevara, Howard Wiseman
Mar 12, 2016·Physical Review Letters·Jose Joaquin AlonsoAlessandro Romito
May 12, 2016·Nature Communications·M NaghilooK W Murch
Aug 31, 2016·Physical Review. E·Sebastian DeffnerWojciech H Zurek
Oct 28, 2016·Nature·Shay Hacohen-GourgyIrfan Siddiqi

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Citations

Jul 10, 2019·Physical Review Letters·Juan AtalayaAlexander N Korotkov
Jan 25, 2020·Physical Review Letters·D A IvanovI B Mekhov
May 23, 2020·Physical Review Letters·T PeronninB Huard
Mar 7, 2020·Physical Review Letters·Daniel SzombatiArkady Fedorov
Dec 2, 2020·Physical Review Letters·Matteo A C RossiMarco G Genoni

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Methods Mentioned

BETA
fluorescence measurement

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