This article is cited in 2 papers

Physics of ultra cold atoms and their applications

Control of atomic Bose – Einstein condensate with interferometric feedback probing

V. A. Tomilin, L. V. Il'ichev

Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk

Abstract: We consider the problem of decoherence in a Bose – Einstein condensate (BEC) of noninteracting atoms during interferometric probing with a classical monochromatic external field. The condensate is located in one of the arms of the Mach – Zehnder interferometer, while part of the radiation from the interferometer output is fed back to the input, thereby closing the coherent feedback loop. A more general setting of the problem is also considered, in which the condensate is located in a system of interferometers 'nested' into each other, while part of the output radiation of each of them is also fed back to its input, closing the so-called multiloop feedback. The possibility of effective control of decoherence rates of various matrix elements is shown. The application of feedback of the proposed type to BEC in a double-well potential is investigated. It is found that this feedback allows efficient control of the distribution of atoms between the wells.

Keywords: Bose – Einstein atomic condensate, interferometric probing, feedback, decoherence rate.

Received: 11.03.2020
Revised: 30.03.2020

 English version: Quantum Electronics, 2020, 50:6, 537–542

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