Trade-off between path entanglement and quantum sensitivity
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9zyr-by5p.pdf
Description
Published version
Size
480.45 KB
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Adobe PDF
Checksum (MD5)
c1816e31c7c003cb73428c4e8927b004
Author(s)
Lou, Benjamin
Loughlin, Hudson A
Mavalvala, Nergis
Date Issued
October 17, 2025
Journal
Physical Review Research
Publisher
American Physical Society (APS)
Citation
Lou, Benjamin, Loughlin, Hudson A and Mavalvala, Nergis. 2025. "Trade-off between path entanglement and quantum sensitivity." Physical Review Research, 7 (4).
Version
Final published version
Abstract
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.
MIT Department
LIGO (Observatory : Massachusetts Institute of Technology)
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1103/9zyr-by5p
