Fundamental Limit of Phase Coherence in Two-Component Bose-Einstein Condensates

Li, Yifan and Pawłowski, Krzysztof and Décamps, Boris and Colciaghi, Paolo and Fadel, Matteo and Treutlein, Philipp and Zibold, Tilman. (2020) Fundamental Limit of Phase Coherence in Two-Component Bose-Einstein Condensates. Physical Review Letters, 125 (12). p. 123402.

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Official URL: https://edoc.unibas.ch/78995/

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We experimentally and theoretically study phase coherence in two-component Bose-Einstein condensates of Rb87 atoms on an atom chip. Using Ramsey interferometry we determine the temporal decay of coherence between the |F=1,mF=-1> and |F=2,mF=+1> hyperfine ground states. We observe that the coherence is limited by random collisional phase shifts due to the stochastic nature of atom loss. The mechanism is confirmed quantitatively by a quantum trajectory method based on a master equation which takes into account collisional interactions, atom number fluctuations, and losses in the system. This decoherence process can be slowed down by reducing the density of the condensate. Our findings are relevant for experiments on quantum metrology and many-particle entanglement with Bose-Einstein condensates and the development of chip-based atomic clocks.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
UniBasel Contributors:Treutlein, Philipp and Li, Yifan and Décamps, Boris Clément and Colciaghi, Paolo and Fadel, Matteo and Zibold, Tilman
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article -- Additional publication or translation in: https://arxiv.org/abs/2004.02492
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Last Modified:21 Apr 2021 14:53
Deposited On:21 Apr 2021 14:52

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