A Trade-Off Between Path Entanglement and Quantum Sensitivity

Fuente: arXiv
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Main Authors: Lou, Benjamin, Loughlin, Hudson A., Mavalvala, Nergis
Format: Preprint
Published: 2024
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_version_ 1866908337054941184
author Lou, Benjamin
Loughlin, Hudson A.
Mavalvala, Nergis
author_facet Lou, Benjamin
Loughlin, Hudson A.
Mavalvala, Nergis
contents Entanglement often increases quantum measurement schemes' sensitivity. However, we find that in precision measurements with zero-mean Gaussian states, such as squeezed states, entanglement between different paths degrades measurement sensitivity. We prove an inverse relationship between entanglement entropy and sensitivity for measurements of single-mode phase shifts in multimode systems and for phase shifts on both modes in two-mode systems. In the two-mode case, which models devices such as interferometers, we find that entanglement strongly degrades differential phase sensitivity. Finally, we show that minimizing entanglement between paths maximizes the phase sensitivity of $N$-mode systems with zero-mean Gaussian state inputs.
format Preprint
id arxiv_https___arxiv_org_abs_2411_18832
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle A Trade-Off Between Path Entanglement and Quantum Sensitivity
Lou, Benjamin
Loughlin, Hudson A.
Mavalvala, Nergis
Quantum Physics
Atomic Physics
Optics
Entanglement often increases quantum measurement schemes' sensitivity. However, we find that in precision measurements with zero-mean Gaussian states, such as squeezed states, entanglement between different paths degrades measurement sensitivity. We prove an inverse relationship between entanglement entropy and sensitivity for measurements of single-mode phase shifts in multimode systems and for phase shifts on both modes in two-mode systems. In the two-mode case, which models devices such as interferometers, we find that entanglement strongly degrades differential phase sensitivity. Finally, we show that minimizing entanglement between paths maximizes the phase sensitivity of $N$-mode systems with zero-mean Gaussian state inputs.
title A Trade-Off Between Path Entanglement and Quantum Sensitivity
topic Quantum Physics
Atomic Physics
Optics
url https://arxiv.org/abs/2411.18832