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Quantum Fidelity for Arbitrary Gaussian States

Open access
Banchi, Leonardo, Braunstein, Samuel L., Pirandola, Stefano·2015·Physical Review Letters

Abstract

We derive a computable analytical formula for the quantum fidelity between two arbitrary multimode Gaussian states which is simply expressed in terms of their first- and second-order statistical moments. We also show how such a formula can be written in terms of symplectic invariants and used to derive closed forms for a variety of basic quantities and tools, such as the Bures metric, the quantum Fisher information, and various fidelity-based bounds. Our result can be used to extend the study of continuous-variable protocols, such as quantum teleportation and cloning, beyond the current one-mode or two-mode analyses, and paves the way to solve general problems in quantum metrology and quantum hypothesis testing with arbitrary multimode Gaussian resources.

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Metadata

Authors
Banchi, L., Braunstein, S. L., & Pirandola, S.
Venue
Physical Review Letters
Published
2015-12-22
Volume
115
Issue
26
Pages
260501-260501
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2120008439
Cited by
259
References
10
FWCI
14.39
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Quantum Fidelity for Arbitrary Gaussian States. https://app.cochat.ai/papers/10.1103/physrevlett.115.260501
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Banchi, L., Braunstein, S. L., & Pirandola, S. (2015). Quantum Fidelity for Arbitrary Gaussian States. Physical Review Letters. https://doi.org/10.1103/physrevlett.115.260501

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