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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Ficheux Q,Jezouin S,Leghtas Z,Huard Bdoi
10.1038/s41467-018-04372-9subject
Has Abstractpub_date
2018-05-15 00:00:00pages
1926issue
1issn
2041-1723pii
10.1038/s41467-018-04372-9journal_volume
9pub_type
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