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Delta-kick Squeezing

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arxiv 2103.10896 v1 pith:H7YSREHW submitted 2021-03-19 quant-ph

Delta-kick Squeezing

classification quant-ph
keywords actionatomdelta-kicksensitivitysqueezingallowsamplifyingassuming
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We explore the possibility to overcome the standard quantum limit (SQL) in a free-fall atom interferometer using a Bose-Einstein condensate (BEC) in either of the two relevant cases of Bragg or Raman scattering light pulses. The generation of entanglement in the BEC is dramatically enhanced by amplifying the atom-atom interactions via the rapid action of an external trap focusing the matter-waves to significantly increase the atomic densities during a preparation stage -- a technique we refer to as delta-kick squeezing (DKS). The action of a second DKS operation at the end of the interferometry sequence allows to implement a non-linear readout scheme making the sub-SQL sensitivity highly robust against imperfect atom counting detection. We predict more than 30 dB of sensitivity gain beyond the SQL for the variance, assuming realistic parameters and $10^6$ atoms.

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