Quantum properties of superpositions of oppositely squeezed states

• URL: http://arxiv.org/abs/2511.03204v1
• Date: Wed, 05 Nov 2025 05:43:14 GMT
• Title: Quantum properties of superpositions of oppositely squeezed states
• Authors: Hiroo Azuma, William J. Munro, Kae Nemoto,
• Abstract summary: Superpositions of oppositely squeezed states can be regarded as Schrodinger cat states.<n>We analyze their Wigner function and quantify the entanglement generated when they are injected into a 50:50 beam splitter.<n>Our results indicate that such states are promising resources for continuous-variable quantum information processing.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the quantum properties of superpositions of oppositely squeezed states, which can be regarded as Schrodinger cat states. Compared with conventional coherent-state cat states, these states exhibit distinct photon-number structures and enhanced nonclassical features. We analyze their Wigner function and quantify the entanglement generated when they are injected into a 50:50 beam splitter. For small squeezing parameters, the resulting two-mode states possess higher entanglement than pure two-mode squeezed vacuum states. We also propose a linear-optical heralding scheme that approximates this superposition of oppositely squeezed states without requiring strong Kerr nonlinearities. Our results indicate that such states are promising resources for continuous-variable quantum information processing, particularly in regimes where high non-Gaussianity and strong entanglement are desirable.

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