Memory-assisted squeezed light velocimetry under realistic loss and incoherent noise
Abstract
We propose a velocity sensor based on a two-memory Mach--Zehnder interferometer fed by a coherent probe and squeezed vacuum, read out by balanced homodyne detection. One memory is taken as a stationary reference, while the second memory moves during storage, so that its velocity is mapped onto a differential interferometric phase at readout. The two memories are otherwise assumed identical and are described by a Gaussian write--store--read lifetime together with the associated unconditional noise floor. Using the classical Fisher information, we derive the velocity sensitivity, the transmission threshold required for a target quantum gain, and the optimum storage time. The squeezed scheme improves on equal-resource coherent homodyne within an operating window set mainly by total transmission and phase stability. For representative near-term parameters, unconditional memory noise floors up to about 10−1 photons per trial do not by themselves remove the advantage; after optimization the improvement remains at the few-percent level and is limited chiefly by loss.
Versions
Related
- Time-Switching Energy-Harvesting Quantum Relay-Assisted FSO Communication with Displaced Squeezed Signaling
- Laser Doppler Velocimetry Measurements of Acoustic–Turbulent Flow Interaction over Liner
- Limits of Memory-Assisted Coherence in Cavity-Embedded Molecules.
- QNETSIM for memory assisted design of satellite and hybrid quantum networks
- Noise-Assisted Quantum Entanglement: Memory-Enhanced Coherence in Stochastic Jaynes-Cummings Dynamics
BibTeX
@misc{gundogan2026memoryassisted,
title = {{Memory-assisted squeezed light velocimetry under realistic loss and incoherent noise}},
author = {Mustafa Gündoğan and Arash Ahmadi and Markus Krutzik},
howpublished = {arXiv},
year = {2026},
month = may,
doi = {10.48550/arxiv.2605.27723},
eprint = {2605.27723},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.27723},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Memory-assisted squeezed light velocimetry under realistic loss and incoherent noise
AU - Mustafa Gündoğan
AU - Arash Ahmadi
AU - Markus Krutzik
PY - 2026
DA - 2026/05/26
PB - arXiv
DO - 10.48550/arxiv.2605.27723
UR - https://arxiv.org/abs/2605.27723
AB - We propose a velocity sensor based on a two-memory Mach--Zehnder interferometer fed by a coherent probe and squeezed vacuum, read out by balanced homodyne detection. One memory is taken as a stationary reference, while the second memory moves during storage, so that its velocity is mapped onto a differential interferometric phase at readout. The two memories are otherwise assumed identical and are described by a Gaussian write--store--read lifetime together with the associated unconditional noise floor. Using the classical Fisher information, we derive the velocity sensitivity, the transmission threshold required for a target quantum gain, and the optimum storage time. The squeezed scheme improves on equal-resource coherent homodyne within an operating window set mainly by total transmission and phase stability. For representative near-term parameters, unconditional memory noise floors up to about 10^−1 photons per trial do not by themselves remove the advantage; after optimization the improvement remains at the few-percent level and is limited chiefly by loss.
ER -