期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.260501
关键词
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资金
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC Grant [308253]
- Leverhulme Trust
- EPSRC via qDATA [EP/L011298/1]
- UK Quantum Communications Hub [EP/M013472/1]
- EPSRC [EP/L011298/1, EP/M013472/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L011298/1, EP/M013472/1] Funding Source: researchfish
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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