Capacities of quantum channels for massive bosons and fermions.
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 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.
ICFO-Institut de Ciències Fotòniques, Parc Mediterrani de la Tecnologia, Castelldefels (Barcelona), Spain.
Aditi
A
SenDe
Ujjwal
U
Sen
Bartosz
B
Gromek
Dagmar
D
Bruss
Maciej
M
Lewenstein