Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.030503
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Funding
- Belgian FRIA foundation
- F.R.S.-FNRS under the Eranet project HIPERCOM
- Interuniversity Attraction Poles program of the Belgian Science Policy Office [IAP P7-35]
- Brussels Capital Region under the project CRYPTASC
- ULB under the program Ouvertures internationales''
- Alexander von Humboldt Foundation
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We prove the equivalence of an arbitrary single-mode Gaussian quantum channel and a newly defined fiducial channel preceded by a phase shift and followed by a Gaussian unitary operation. This equivalence implies that the energy-constrained classical capacity of any single-mode Gaussian channel can be calculated based on this fiducial channel, which is furthermore simply realizable with a beam splitter, two identical single-mode squeezers, and a two-mode squeezer. In a large domain of parameters, we also provide an analytical expression for the Gaussian classical capacity, exploiting its additivity, and prove that the classical capacity cannot exceed it by more than 1/ln2 bits.
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