Coherence Times of Bose-Einstein Condensates beyond the Shot-Noise Limit via Superfluid Shielding
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PhysRevLett.117.275301.pdf
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Author(s)
Burton, William Cody
Kennedy, Colin
Chung, Woo Chang
Vadia, Samarth
Chen, Wenlan
Ketterle, Wolfgang
Date Issued
December 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Burton, William Cody et al. “Coherence Times of Bose-Einstein Condensates beyond the Shot-Noise Limit via Superfluid Shielding.” Physical Review Letters 117.27 (2016): n. pag. © 2016 American Physical Society
Version
Final published version
Abstract
We demonstrate a new way to extend the coherence time of separated Bose-Einstein condensates that involves immersion into a superfluid bath. When both the system and the bath have similar scattering lengths, immersion in a superfluid bath cancels out inhomogeneous potentials either imposed by external fields or inherent in density fluctuations due to atomic shot noise. This effect, which we call superfluid shielding, allows for coherence lifetimes beyond the projection noise limit. We probe the coherence between separated condensates in different sites of an optical lattice by monitoring the contrast and decay of Bloch oscillations. Our technique demonstrates a new way that interactions can improve the performance of quantum devices.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.117.275301
