Quantum enhancement and Doppler suppression of Kasevich-Chu atom interferometer with motional squeezing states

• URL: http://arxiv.org/abs/2606.16632v1
• Date: Mon, 15 Jun 2026 12:23:51 GMT
• Title: Quantum enhancement and Doppler suppression of Kasevich-Chu atom interferometer with motional squeezing states
• Abstract summary: Internal and external atomic degrees of freedom are hybridized in a Kasevich-Chu interferometer.<n>By introducing motional squeezing state as an input, we derive the computational framework of quantum and classical Fisher information.
• Score: 5.487852330417353
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Hybridization of internal and external atomic degrees of freedom in a Kasevich-Chu interferometer enables the possibility to enhance the sensitivity significantly even under quantum-standard limit. By introducing motional squeezing state as an input, we systematically derive the computational framework of quantum and classical Fisher information of two measurement protocols for arbitrary strength of Doppler effects. Through maximizing the corresponding classical Fisher information, we obtain the optimal control parameters and the corresponding quantum Fisher information. For population measurement, the largest sensitivity can be as large as four times than the semi-classical limit through enlarging the atom coherence length. For joint measurement of population and position, the competition between quantum enhancement and Doppler suppression induces two three behaviors, in one regime, the quantum enhancement dominates even in presence of strong Doppler broadening effects where the sensitivity is significantly enhanced; while in another regime, an optimal squeezing parameter is observed where the classical Fisher information reaches the maximum. Our results clearly demonstrate the robustness of external quantum enhancement against Doppler suppression. Our proposal can be readily applied to gravimeter of mobile platform where decoherence from noise will damage the many-body entanglement of internal spin squeezing.

Related papers

• Tunable Exceptional Points for Quantum Sensing in a Spin--Orbit-Angular-Momentum Coupled BEC [31.056304866140625]
  We investigate a tunable EP sensing platform based on the intrinsic non-Hermitian Bogoliubov dynamics of a Bose-Einstein condensate.<n>We identify multiple EPs and map their trajectories, revealing strong quantum Fisher information enhancement when the EPs are approached from the PT-symmetric stable regime.<n>We show that a spin-density measurement can approach the quantum Fisher information limit, providing an experimentally accessible route to tunable EP-enhanced quantum sensing in Bose-Einstein condensates.
  arXiv  Detail & Related papers  (2026-08-31T17:03:30Z)
• Quantum Sensing of Birefringence Beyond the Classical Limit with a Hyper-Entangled SU(1,1) Interferometer [2.142732479736229]
  We present an interferometric scheme for detecting unknown small birefringence beyond the shot-noise limit of sensitivity.<n>Specifically, two pairs of crossed-polarization nonlinear media, both generate and measure two-mode quantum light that is squeezed and polarization-entangled.<n>We present a complete theoretical analysis of the interferometer's sensitivity to small birefringence under realistic conditions of gain and internal loss.
  arXiv  Detail & Related papers  (2026-03-09T19:18:56Z)
• Information-Scrambling-Enhanced Quantum Sensing Beyond the Standard Quantum Limit [24.972499920814034]
  We experimentally demonstrate a scalable, scrambling-enhanced quantum sensing protocol, implemented on a cross-shaped superconducting quantum processor.<n>By harnessing quantum information scrambling, the protocol converts local interactions into delocalized metrologically useful correlations, enabling robust signal amplification.<n>This work demonstrates a readily scalable path toward practical quantum sensing advantages with prevalent experimental platforms.
  arXiv  Detail & Related papers  (2025-12-24T13:05:34Z)
• Approximate universality and large measurement gain of Rabi model in a linear potential under strong Doppler broadening [0.0]
  This study lays a theoretical foundation for developing high-sensitivity, noise-resistant atom gravimeters.<n>We analyze the Doppler effect's impact on Rabi oscillations because of the strong coupling between the internal and external states.
  arXiv  Detail & Related papers  (2025-07-17T10:17:36Z)
• Observation of quantum noise reduction in a Raman amplifier via quantum correlation between atom and light [31.565459861574546]
  We present an experiment to reduce the quantum noise of a Raman amplifier by preparing the atomic medium in a correlated state with the Stokes light field.<n>We report an observation of quantum noise reduction of more than 3.5 dB in the atomic Raman amplification process.
  arXiv  Detail & Related papers  (2025-07-16T04:04:39Z)
• Acoustic phonon phase gates with number-resolving phonon detection [36.29277627484587]
  Itinerant phonons in quantum acoustics, combined with superconducting qubits, offer a compelling alternative to the quantum optics approach.<n>We implement phonon phase control using the frequency-dependent scattering of phonon states from a superconducting transmon qubit.<n>The acoustic interferometer used to measure the resulting phonon phase achieves a noise-floor-limited Hong-Ou-Mandel interference visibility of 98.1%.
  arXiv  Detail & Related papers  (2025-03-05T20:56:35Z)
• Spin Squeezing with Magnetic Dipoles [37.93140485169168]
  Entanglement can improve the measurement precision of quantum sensors beyond the shot noise limit.<n>We take advantage of the magnetic dipole-dipole interaction native to most neutral atoms to realize spin-squeezed states.<n>We achieve 7.1 dB of metrologically useful squeezing using the finite-range spin exchange interactions in an erbium quantum gas microscope.
  arXiv  Detail & Related papers  (2024-11-11T18:42:13Z)
• Oscillatory dissipative tunneling in an asymmetric double-well potential [32.65699367892846]
  Chemical research will benefit from a fully adjustable, asymmetric double-well equipped with precise measurement capabilities of the tunneling rates.<n>We show a quantum simulator system that consists of a continuously driven Kerr parametric oscillator with a third order non-linearity that can be operated in the quantum regime to create a fully asymmetric double-well.<n>Our work is a first step for the development of analog molecule simulators of proton transfer reactions based on quantum superconducting circuits.
  arXiv  Detail & Related papers  (2024-09-19T22:43:07Z)
• Effect of the readout efficiency of quantum measurement on the system entanglement [44.99833362998488]
  We quantify the entanglement for a particle on a 1d quantum random walk under inefficient monitoring. We find that the system's maximal mean entanglement at the measurement-induced quantum-to-classical crossover is in different ways by the measurement strength and inefficiency.
  arXiv  Detail & Related papers  (2024-02-29T18:10:05Z)
• Enhanced coherent light-matter interaction and room-temperature quantum yield of plasmonic resonances engineered by a chiral exceptional point [1.074267520911262]
  We propose to tailor the local density of states (LDOS) of plasmonic resonances by integrating with a photonic cavity operating at a chiral exceptional point (CEP) A quantized few-mode theory is employed to reveal that the LDOS of the proposed hybrid cavity can evolve into sub-tzian lineshape, with order-of-magnitude linewidth narrowing. This results in the enhanced coherent light-matter interaction accompanied by the reduced dissipation of polaritonic states.
  arXiv  Detail & Related papers  (2023-08-08T13:10:04Z)
• Enhanced optomechanical interaction in the unbalanced interferometer [40.96261204117952]
  Quantum optomechanical systems enable the study of fundamental questions on quantum nature of massive objects. Here we propose a modification of the Michelson-Sagnac interferometer, which allows to boost the optomechanical coupling strength.
  arXiv  Detail & Related papers  (2023-05-11T14:24:34Z)
• Modes mismatch induced variation of quantum coherence for two-mode localized Gaussian states in accelerated frame [2.179313476241343]
  We show how a pair of uniformly accelerated observers with a local two-mode Gaussian quantum state affects the quantum coherence. We find that the quantum coherence decreases with increasing acceleration, which is due to the Unruh effect that destroys the quantum resource.
  arXiv  Detail & Related papers  (2023-04-17T14:12:56Z)
• Robust phase metrology with hybrid quantum interferometers against particle losses [0.0]
  Entanglement is an important quantum resource to achieve high sensitive quantum metrology. We propose a spin-oscillator hybrid quantum interferometer to achieve the desirable precise estimation of the encoded parameter. The proposed hybrid quantum interferometer possesses a manifest robustness against the particle losses of the vibrational modes.
  arXiv  Detail & Related papers  (2023-03-12T08:14:01Z)
• Noise prediction and reduction of single electron spin by deep-learning-enhanced feedforward control [26.13935769245144]
  Noise-induced control imperfection is an important problem in applications of diamond-based nano-scale sensing. We introduce the deep learning approach to relax this restriction by predicting the trend of noise and compensating the delay.
  arXiv  Detail & Related papers  (2022-01-16T09:19:18Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.