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Retrieval of cavity-generated atomic spin squeezing after free-space release

Wu, Yunfan and Krishnakumar, Rajiv and Martínez-Rincón, Julián and Malia, Benjamin K. and Hosten, Onur and Kasevich, Mark A. (2020) Retrieval of cavity-generated atomic spin squeezing after free-space release. Physical Review A, 102 (1). Art. No. 012224. ISSN 2469-9926.

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We demonstrate that releasing atoms into free space from an optical lattice does not deteriorate cavity-generated spin squeezing for metrological purposes. In this work, an ensemble of 500000 spin-squeezed atoms in a high-finesse optical cavity with near-uniform atom-cavity coupling is prepared, released into free space, recaptured in the cavity, and probed. Up to ∼10 dB of metrologically relevant squeezing is retrieved for 700μs free-fall times, and decaying levels of squeezing are realized for up to 3 ms free-fall times. The degradation of squeezing results from loss of atom-cavity coupling homogeneity between the initial squeezed state generation and final collective state readout. A theoretical model is developed to quantify this degradation and this model is experimentally validated.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wu, Yunfan0000-0001-7193-4263
Krishnakumar, Rajiv0000-0002-1843-235X
Martínez-Rincón, Julián0000-0002-7699-9370
Malia, Benjamin K.0000-0002-3512-9387
Hosten, Onur0000-0002-2031-204X
Additional Information:© 2020 American Physical Society. Received 14 December 2019; accepted 15 June 2020; published 30 July 2020. We thank N. Engelsen for comments on the manuscript. This work was supported by the Office of Naval Research, Vannevar Bush Faculty Fellowship, Department of Energy, and Defense Threat Reduction Agency. R.K. was partly supported by the AQT/INQNET program at Caltech.
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Vannevar Bush Faculty FellowshipUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Defense Threat Reduction Agency (DTRA)UNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20200730-124922237
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104657
Deposited By: Tony Diaz
Deposited On:31 Jul 2020 15:40
Last Modified:31 Jul 2020 15:40

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