2014/08/31 by Stuart S. Szigeti, Behnam Tonekaboni, Wing Yung S. Lau +3 · 4 citations
Computer Science · Physics and Astronomy · #Astronomical interferometer #Atom (system on chip) #Atom interferometer #Atomic and Subatomic Physics Research #Coherent states #Cold Atom Physics and Bose-Einstein Condensates #Computer science #Electronic engineering #Heisenberg limit #Interferometry #Limit (mathematics) #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum information #Quantum limit #Quantum mechanics #Quantum network #Quantum optics #Quantum sensor #Sensitivity (control systems) #Squeezed coherent state #Vacuum state #cond-mat.quant-gas #physics.atom-ph #physics.optics #quant-ph
paper · pdf · doi:10.1103/physreva.90.063630
published as Phys. Rev. A 90, 063630 (2014) · 20 pages, 17 figures
arxiv created 2014/12/22 · openalex publication_date 2014/12/22 · arxiv updated 2014/12/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the prospect of enhancing the phase sensitivity of atom interferometers in the Mach-Zehnder configuration with squeezed light. Ultimately, this enhancement is achieved by transferring the quantum state of squeezed light to one or more of the atomic input beams, thereby allowing operation below the standard quantum limit. We analyze in detail three specific schemes that utilize (1) single-mode squeezed optical vacuum (i.e., low-frequency squeezing), (2) two-mode squeezed optical vacuum (i.e., high-frequency squeezing) transferred to both atomic inputs, and (3) two-mode squeezed optical vacuum transferred to a single atomic input. Crucially, our analysis considers incomplete quantum state transfer (QST) between the optical and atomic modes, and the effects of depleting the initially prepared atomic source. Unsurprisingly, incomplete QST degrades the sensitivity in all three schemes. We show that by measuring the transmitted photons and using information recycling [Phys. Rev. Lett. 110, 053002 (2013)], the degrading effects of incomplete QST on the sensitivity can be substantially reduced. In particular, information recycling allows scheme (2) to operate at the Heisenberg limit irrespective of the QST efficiency, even when depletion is significant. Although we concentrate on Bose-condensed atomic systems, our scheme is equally applicable to ultracold thermal vapors.