Momentum Entanglement for Atom Interferometry

authored by
F. Anders, A. Idel, P. Feldmann, D. Bondarenko, S. Loriani, K. Lange, J. Peise, M. Gersemann, B. Meyer-Hoppe, S. Abend, N. Gaaloul, C. Schubert, D. Schlippert, L. Santos, E. Rasel, C. Klempt
Abstract

The Standard Quantum Limit (SQL) restricts the sensitivity of atom interferometers employing unentangled ensembles. Inertially sensitive light-pulse atom interferometry beyond the SQL requires the preparation of entangled atoms in different momentum states. So far, such a source of entangled atoms that is compatible with state-of-the-art interferometers has not been demonstrated. Here, we report the transfer of entanglement from the spin degree of freedom of a Bose-Einstein condensate to well-separated momentum modes. A measurement of number and phase correlations between the two momentum modes yields a squeezing parameter of -3.1(8) dB. The method is directly applicable for a future generation of entanglement-enhanced atom interferometers as desired for tests of the Einstein Equivalence Principle and the detection of gravitational waves.

Organisation(s)
Institute of Quantum Optics
Institute of Theoretical Physics
External Organisation(s)
DLR-Institute for Satellite Geodesy and Inertial Sensing
Type
Article
Journal
Physical Review Letters
Volume
127
ISSN
0031-9007
Publication date
01.10.2021
Publication status
Published
Peer reviewed
Yes
ASJC Scopus subject areas
Physics and Astronomy(all)
Electronic version(s)
https://arxiv.org/abs/2010.15796 (Access: Open)
https://doi.org/10.1103/PhysRevLett.127.140402 (Access: Closed)