Unravelling-based (auto)control of back-action in atomic Bose–Einstein condensate

We present a novel feedback control method for quantum systems. Feedback does not affect the controlled system itself. Instead, it controls the unravelling of the quantum channel of interaction between the system and its environment. This interaction can be represented as a history of events. If the...

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Bibliographic Details
Published in:Frontiers of physics 2024-08, Vol.19 (4), Article 41201
Main Authors: Tomilin, V. A., Il’ichov, L. V.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Atomic
Condensed Matter Physics
Molecular
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Research Article
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Summary:We present a novel feedback control method for quantum systems. Feedback does not affect the controlled system itself. Instead, it controls the unravelling of the quantum channel of interaction between the system and its environment. This interaction can be represented as a history of events. If their informational content is changed, their back-action on the system is also modified. Feedback action is trigged by the events, thus granting the system the degree of control over its own state. The efficiency of the proposed scheme is demonstrated on the example of two-mode atomic Bose-Einstein condensate, with one of its modes subject to phase-contrast imaging in a Mach–Zehnder interferometer. The histories of photocounts in the output channels of the interferometer are used for feedback. Its capabilities of state engineering are studied for different settings of the feedback loop and different numbers of events in the recorded histories.
ISSN:2095-0462
2095-0470
DOI:10.1007/s11467-023-1375-2