Qubit readout and quantum sensing with pulses of quantum radiation

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Different hypotheses about a quantum system such as the logical state of a qubit or the value of physical interaction parameters can be investigated by the interaction with a probe field. Such fields may be prepared in particularly sensitive quantum states and we demonstrate here the use of quantum trajectories to model the stochastic measurement record and conditional evolution of the state of the quantum system subject to its interaction with a traveling pulse of radiation. Our analysis applies to different measurement strategies and to arbitrary input quantum states of the probe field pulse and it thus permits direct comparison of their metrological advantages. A theoretical lower limit to the mean discrimination error can be calculated in a deterministic manner and we verify that it lies below the average inference error in all our examples.
OriginalsprogEngelsk
Artikelnummer013705
TidsskriftPhysical Review A
Vol/bind107
Udgave nummer1
Antal sider7
ISSN2469-9926
DOI
StatusUdgivet - 2023

Bibliografisk note

Funding Information:
This work is supported by the Danish National Research Foundation through the Center of Excellence “CCQ” (Grant Agreement No. DNRF156); the European QuantERA grant C'MON-QSENS!, by Innovation Fund Denmark Grant No. 9085-00002B; and the Knut and Alice Wallenberg Foundation through the Wallenberg Center for Quantum Technology (WACQT).

Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by "https://www.kb.se/samverkan-och-utveckling/oppen-tillgang-och-bibsamkonsortiet/bibsamkonsortiet.html"Bibsam.

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