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Spin-orbit-coupled interferometry with ring-trapped Bose-Einstein condensates.

Helm, J. L. and Billam, T. P. and Rakonjac, A. and Cornish, S. L. and Gardiner, S. A. (2018) 'Spin-orbit-coupled interferometry with ring-trapped Bose-Einstein condensates.', Physical review letters., 120 (6). 063201.


We propose a method of atom interferometry using a spinor Bose-Einstein condensate with a timevarying magnetic field acting as a coherent beam splitter. Our protocol creates long-lived superpositional counterflow states, which are of fundamental interest and can be made sensitive to both the Sagnac effect and magnetic fields on the sub-μG scale. We split a ring-trapped condensate, initially in the mf ¼ 0 hyperfine state, into superpositions of internal mf ¼ 1 states and condensate superflow, which are spinorbit coupled. After interrogation, the relative phase accumulation can be inferred from a population transfer to the mf ¼ 1 states. The counterflow generation protocol is adiabatically deterministic and does not rely on coupling to additional optical fields or mechanical stirring techniques. Our protocol can maximize the classical Fisher information for any rotation, magnetic field, or interrogation time and so has the maximum sensitivity available to uncorrelated particles. Precision can increase with the interrogation time and so is limited only by the lifetime of the condensate.

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Publisher statement:Reprinted with permission from the American Physical Society: Helm, J. L., Billam, T. P., Rakonjac, A., Cornish, S. L. & Gardiner, S. A. (2018). Spin-Orbit-Coupled Interferometry with Ring-Trapped Bose-Einstein Condensates. Physical Review Letters 120(6): 063201 © 2018 American Physical Society by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:10 January 2018
Date deposited:22 February 2018
Date of first online publication:06 February 2018
Date first made open access:22 February 2018

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