Squeezing Enhancement in Lossy Multi-Path Atom Interferometers
Abstract
This paper explores the sensitivity gains afforded by spin-squeezed states in atom interferometry, in particular using Bragg diffraction. We introduce a generalised input-output formalism that accurately describes realistic, non-unitary interferometers, including losses due to velocity selectivity and scattering into undesired momentum states. This formalism is applied to evaluate the performance of one-axis twisted spin-squeezed states in improving phase sensitivity. Our results show that by carefully optimising the parameters of the Bragg beam splitters and controlling the degree of squeezing, it is possible to improve the sensitivity of the interferometer by several dB with respect to the standard quantum limit despite realistic levels of losses in light pulse operations. However, the analysis also highlights the challenges associated with achieving these improvements in practice, most notably the impact of finite temperature on the benefits of entanglement. The results suggest ways of optimising interferometric setups to exploit quantum entanglement under realistic conditions, thereby contributing to advances in precision metrology with atom interferometers.
Details
- Organisation(s)
-
Institute of Theoretical Physics
Quantum Sensing
QUEST-Leibniz Research School
Laboratory of Nano and Quantum Engineering
QuantumFrontiers
- Type
- Article
- Journal
- Quantum
- Volume
- 10
- No. of pages
- 12
- ISSN
- 2521-327X
- Publication date
- 01.06.2026
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics, Physics and Astronomy (miscellaneous)
- Electronic version(s)
-
https://doi.org/10.22331/q-2026-06-01-2122 (Access:
Open
)
https://doi.org/10.48550/arXiv.2409.04091 (Access: Open )
