Accessible Information in Multi-access Quantum Channels

Mark M. Wilde

ARMEN E. ALLAHVERDYAN, David B. Saakian

The multi-access channels in quantum information theory are considered. Classical messages from independent sources, which are represented as some quantum states, are transported by a channel to one address. The messages can interact with each other and with external environment. After statement of problem and proving some general results we investigate physically important case when information is transported by states of electromagnetic field. One-way communication by noisy quantum channels is also considered.

Mark M. Wilde

Wenbin Yu, Yinsong Xu, Wenjie Liu +2 more

Multi-user detection is one of the important technical problems for modern communications. In the field of quantum communication, the multi-access channel on which we apply the technology of quantum information processing is still an open question. In this work, we investigate the multi-user detection problem based on the binary coherent-state signals whose communication way is supposed to be seen as a quantum channel. A binary phase shift keying model of this multi-access channel is studied and a novel method of quantum detection proposed according to the conclusion of the quantum measurement theory. As a result, the average interference between deferent users is presented and the average error probability of the quantum detection is derived theoretically. Finally, we show the maximum channel capacity of this effective detection for a two-access quantum channel

Yuhang Yang

Quantum communication is a new technique.It is based on the quantum mechanics,and is entirely different from the classical communication used nowadays.This paper focuses on the multi-users transportation within the quantum channel environment,utilizes the single user quantum channel model in order to (analyze) the case of multi-access,and gives out the specialty of the quantum channel.

ARMEN E. ALLAHVERDYAN, D. B. Saakyan