Towards Entanglement-Enhanced Atom Interferometry Using Bow-Tie Cavities
Abstract
Atom interferometers are among the most sensitive instruments for precision measurements and tests of fundamental physics. Their performance, however, is ultimately limited by quantum projection noise when uncorrelated atomic ensembles are employed. Cavity-assisted generation of entangled states has proven to be a promising route toward quantum-enhanced interferometry beyond the standard quantum limit. In this work, we present the realization and characterization of a monolithic bow-tie cavity developed to achieve a strong collective atom-light coupling with strontium atoms. Unlike conventional standing-wave Fabry-Pérot resonators, the traveling-wave geometry of the bow-tie cavity provides homogeneous atom-light coupling over the entire atomic ensemble, making it particularly suitable for entanglement-enhanced atom interferometry with freely falling atoms. The monolithic cavity architecture presents several scientifically relevant features such as high mechanical stability, high finesse, robustness against mirror misalignment, optical and atomic access and the option of generating squeezed states through different strategies. The cavity was realized for operation on the strontium (5s2) 1S0−(5s5p) 3P1 transition at 689 nm and achieves a finesse of ℱ=5.7× 104 while keeping the transmission of a single mirror sufficiently large to allow for efficient atomic information extraction. In this geometry, the cavity supports two foci with waists of 164 μm and 31 μm which gives access to different regimes of atom-cavity coupling. For ensembles containing up to 105 atoms, the cavity is expected to enable a Wineland squeezing parameter ξ2 of 24 dB through cavity-feedback squeezing, and 28 dB through quantum non-demolition measurements, demonstrating its potential as a platform for next-generation quantum-enhanced atom interferometers.
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BibTeX
@misc{mancini2026towards,
title = {{Towards Entanglement-Enhanced Atom Interferometry Using Bow-Tie Cavities}},
author = {Christian Mancini and Marco Malitesta and Tommaso Mariani and Annalisa Pappalardo and Giuseppe Vinelli and Paolo Vezio and Gabriele Rosi and Enrico Meli and Leonardo Salvi and Guglielmo Maria Tino},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.18552},
eprint = {2606.18552},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.18552},
}
RIS
TY - UNPB
TI - Towards Entanglement-Enhanced Atom Interferometry Using Bow-Tie Cavities
AU - Christian Mancini
AU - Marco Malitesta
AU - Tommaso Mariani
AU - Annalisa Pappalardo
AU - Giuseppe Vinelli
AU - Paolo Vezio
AU - Gabriele Rosi
AU - Enrico Meli
AU - Leonardo Salvi
AU - Guglielmo Maria Tino
PY - 2026
DA - 2026/09/23
PB - arXiv
DO - 10.48550/arxiv.2606.18552
UR - https://arxiv.org/abs/2606.18552
AB - Atom interferometers are among the most sensitive instruments for precision measurements and tests of fundamental physics. Their performance, however, is ultimately limited by quantum projection noise when uncorrelated atomic ensembles are employed. Cavity-assisted generation of entangled states has proven to be a promising route toward quantum-enhanced interferometry beyond the standard quantum limit. In this work, we present the realization and characterization of a monolithic bow-tie cavity developed to achieve a strong collective atom-light coupling with strontium atoms. Unlike conventional standing-wave Fabry-Pérot resonators, the traveling-wave geometry of the bow-tie cavity provides homogeneous atom-light coupling over the entire atomic ensemble, making it particularly suitable for entanglement-enhanced atom interferometry with freely falling atoms. The monolithic cavity architecture presents several scientifically relevant features such as high mechanical stability, high finesse, robustness against mirror misalignment, optical and atomic access and the option of generating squeezed states through different strategies. The cavity was realized for operation on the strontium (5s^2) ^1S_0−(5s5p) ^3P_1 transition at 689 nm and achieves a finesse of ℱ=5.7× 10^4 while keeping the transmission of a single mirror sufficiently large to allow for efficient atomic information extraction. In this geometry, the cavity supports two foci with waists of 164 μm and 31 μm which gives access to different regimes of atom-cavity coupling. For ensembles containing up to 10^5 atoms, the cavity is expected to enable a Wineland squeezing parameter ξ^2 of 24 dB through cavity-feedback squeezing, and 28 dB through quantum non-demolition measurements, demonstrating its potential as a platform for next-generation quantum-enhanced atom interferometers.
ER -