Quantum multiplexing with optical coherent states

Details Quantum multiplexing with optical coherent states Quantum multiplexing with optical coherent states

2009-02-16

arxiv.org/abs/0902.2743v1

Quantum Information & Computation, Vol. 9, No. 7&8 (2009)

Physics

Quantum Physics

19 pages, 10 figures

Scientific paper

In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques.

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