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

Abstract

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.

Graphical abstract

Keywords

quantum feedback control / quantum measurements / two-mode Bose−Einstein condensates

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Declarations

The authors declare that they have no competing interests and there are no conflicts.

Acknowledgements

This work was supported by the State order (Project AAAA-A21-121021800168-4) at the Institute of Automation and Electrometry SB RAS.

RIGHTS & PERMISSIONS

2024 Higher Education Press