Delta-Kick Squeezing

authored by: Robin Corgier, Naceur Gaaloul, Augusto Smerzi, Luca Pezzè
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 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.
Organisation(s): Institute of Quantum Optics
QuantumFrontiers
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s): QSTAR
University of Florence (UniFi)
Type: Article
Journal: Physical Review Letters
Volume: 127
ISSN: 0031-9007
Publication date: 29.10.2021
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy(all)
Electronic version(s): http://arxiv.org/abs/2103.10896v1 (Access: Open)
https://doi.org/10.1103/PhysRevLett.127.183401 (Access: Closed)

BibTeX

@article{3d940e37dcb2491a947531cb7b5628cb,
title = "Delta-Kick Squeezing",
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 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. ",
keywords = "quant-ph",
author = "Robin Corgier and Naceur Gaaloul and Augusto Smerzi and Luca Pezz{\`e}",
note = "Funding Information: We thank F. Pereira Dos Santos, P. Wolf, C. Schubert, and K. Hammerer for discussions. This work is supported by the European Union{\textquoteright}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{\textquoteright}s Excellence Strategy EXC-2123 QuantumFrontiers 390837967.",
year = "2021",
month = oct,
day = "29",
doi = "10.1103/PhysRevLett.127.183401",
language = "English",
volume = "127",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "18",
}