Capacities of Quantum Channels for Massive Bosons and Fermions

Details Capacities of Quantum Channels for Massive Bosons and Fermions Capacities of Quantum Channels for Massive Bosons and Fermions

2005-05-05

arxiv.org/abs/quant-ph/0505028v2

Phys. Rev. Lett. 95, 260503 (2005)

Physics

Quantum Physics

4 pages, 3 eps figures, RevTeX4; v2: discussions added, small changes, published version

Scientific paper

10.1103/PhysRevLett.95.260503

We consider the capacity of classical information transfer for noiseless quantum channels carrying a finite average number of massive bosons and fermions. The maximum capacity is attained by transferring the Fock states generated from the grand-canonical ensemble. Interestingly, the channel capacity for a Bose gas indicates the onset of a Bose-Einstein condensation, by changing its qualitative behavior at the criticality, while for a channel carrying weakly attractive fermions, it exhibits the signatures of Bardeen-Cooper-Schrieffer transition. We also show that for noninteracting particles, fermions are better carriers of information than bosons.

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