Abstract
We address quantum phase channels, i.e communication schemes where information is encoded in the phase-shift imposed to a given signal, and analyze their performances in the presence of phase diffusion. We evaluate mutual information for coherent and phase-coherent signals, and for both ideal and realistic phase receivers. We show that coherent signals offer better performances than phase-coherent ones, and that realistic phase channels are effective ones in the relevant regime of low energy and large alphabets.
Original language | British English |
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Article number | 074027 |
Journal | Physica Scripta T |
Volume | 90 |
Issue number | 7 |
DOIs | |
State | Published - 1 Jul 2015 |
Keywords
- Optical communication
- Quantum communications
- Quantum phase