Local Gaussian bounds on the non-destructive discrimination of two-mode squeezed states
Abstract
Typical measurement setups in quantum systems are destructive, meaning that states are irretrievably altered after measurement. In this work, we analyse non-destructive discrimination of two two-mode squeezed vacuum states using local Gaussian measurements. We investigate a tradeoff relation between the success probability of discrimination and the fidelity of the resulting state with the initial state, and construct a protocol given by local Gaussian measurements, which is optimal within our numerically explored class. We also extend to the case where we allow for additional pre-shared entanglement, and show that this regime allows us to exceed the standard local Gaussian bound for the fidelity-success probability tradeoff. Our work provides a natural extension of the tradeoff between information gain and disturbance in entangled-state discrimination, previously established for finite-dimensional quantum systems, to infinite-dimensional continuous-variable systems.
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BibTeX
@misc{so2026local,
title = {{Local Gaussian bounds on the non-destructive discrimination of two-mode squeezed states}},
author = {Mi-Jung So and James Moran and Youngrong Lim and Mahn-Soo Choi and Hyukjoon Kwon},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01373},
eprint = {2609.01373},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01373},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Local Gaussian bounds on the non-destructive discrimination of two-mode squeezed states
AU - Mi-Jung So
AU - James Moran
AU - Youngrong Lim
AU - Mahn-Soo Choi
AU - Hyukjoon Kwon
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01373
UR - https://arxiv.org/abs/2609.01373
AB - Typical measurement setups in quantum systems are destructive, meaning that states are irretrievably altered after measurement. In this work, we analyse non-destructive discrimination of two two-mode squeezed vacuum states using local Gaussian measurements. We investigate a tradeoff relation between the success probability of discrimination and the fidelity of the resulting state with the initial state, and construct a protocol given by local Gaussian measurements, which is optimal within our numerically explored class. We also extend to the case where we allow for additional pre-shared entanglement, and show that this regime allows us to exceed the standard local Gaussian bound for the fidelity-success probability tradeoff. Our work provides a natural extension of the tradeoff between information gain and disturbance in entangled-state discrimination, previously established for finite-dimensional quantum systems, to infinite-dimensional continuous-variable systems.
ER -