Delta-Kick Squeezing

Year: 2021

Authors: Corgier R., Gaaloul N., Smerzi A., Pezzà L.

Autors Affiliation: INO CNR, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy; Leibniz Univ Hannover, Inst Quantenopt, Welfengarten 1, D-30167 Hannover, Germany

Abstract: 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 one to implement a nonlinear 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.


Volume: 127 (18)      Pages from: 183401-1  to: 183401-7

More Information: We thank F. Pereira Dos Santos, P. Wolf, C. Schubert, and K. Hammerer for discussions. This work is supported by the European Union´s Horizon 2020 Research and Innovation Programme-Qombs Project, FET Flagship on Quantum Technologies Grant No. 820419. N. G. acknowledges the support of the CRC 1227 (DQmat) within Project No. A05, the German Space Agency (DLR) for funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) due to an enactment of the German Bundestag under Grants No. 50WM1861 (CAL) and No. 50WM2060 (CARIOQA), and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany´s Excellence Strategy EXC-2123 QuantumFrontiers 390837967.
KeyWords: quantum; entanglement; interferometry; atoms; noise; order; times
DOI: 10.1103/PhysRevLett.127.183401