Quantum dense coding in multiparticle entangled states via local measurements

Details Quantum dense coding in multiparticle entangled states via local measurements Quantum dense coding in multiparticle entangled states via local measurements

2004-02-13

arxiv.org/abs/quant-ph/0402089v1

Chin. Phys. Lett.21 (2004)12-14

Physics

Quantum Physics

3 pages, no figure

Scientific paper

10.1088/0256-307X/21/1/004

In this paper, we study quantum dense coding between two arbitrarily fixed particles in a (N+2)-particle maximally-entangled states through introducing an auxiliary qubit and carrying out local measurements. It is shown that the transmitted classical information amount through such an entangled quantum channel usually is less than two classical bits. However, the information amount may reach two classical bits of information, and the classical information capacity is independent of the number of the entangled particles in the initial entangled state under certain conditions. The results offer deeper insights to quantum dense coding via quantum channels of multi-particle entangled states.

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