Quantum Dense Coding in Multiparticle Entangled States via Local Measurements

Abstract

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