Fundamental limit of phase coherence in two-component Bose-Einstein condensates

Yifan Li, Krzysztof Pawłowski, Boris Décamps, Paolo Colciaghi, Matteo Fadel, Philipp Treutlein, Tilman Zibold

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number123402
JournalPhysical Review Letters
Volume125
Issue number12
DOIs
StatePublished - Sep 2020
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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