Description
We investigate the feasibility of measurement and feedback (MF) control protocols as a means to produce large-scale Bose-Einstein condensates of ultra-cold atomic gases using a recently developed phase-space approach [1] to capture unconditional dynamics of the full quantum-field under measurement and feedback. For experimentally accessible regimes in quasi-two-dimensional geometries, our analysis shows that feedback cooling is capable of efficiently producing highly pure condensates from large-scale incoherent thermal gases, even when limitations such as measurement-induced spontaneous emission and feedback lag are accounted for, offering an efficient alternative to traditional evaporative procedures for cooling high-temperature atomic gases to quantum degeneracy. In addition, as optical control potentials may be actuated through highly configurable digital micromirror devices independent to trapping potentials, feedback cooling also allows for preparation of condensed samples with in less restrictive geometries. Finally, we discuss the application of MF in studying non-equilibrium dynamics such as quantum turbulence and forced steady states in two-dimensional superfluids, as well as quantum phase transitions within a quasi-canonical framework, in contrast to grand-canonical descriptions using open-quantum systems and reservoir theory.
[1] Kaiwen K. Zhu et al., “Simulating feedback cooling of incoherent quantum mixtures,” Phys. Rev. A. 111, 013104 (2025).
| I am the presenting author | Yes |
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