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Secure and asymmetry quantum dense coding via W class state in cavity QED

Zheng‐Yuan Xue, Ping Dong, Yang Ming, You-Min Yi, Zhuo‐Liang Cao

Published Nov 7, 2005• 0 citations
OpenAlex

Abstract

We investigate a secure scheme for implementing quantum dense coding via W class state in cavity QED. By collaboration, both of the two receivers could read the sender's secret. In addition, the scheme is an probabilistic and asymmetry one, the receiver who received Alice's qubit has a higher probability of successful cheat compared with the party who have not.

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We investigate a secure scheme for implementing quantum dense coding via W class state in cavity QED. By collaboration, both of the two receivers could read the sender's secret. In addition, the scheme is an probabilistic and asymmetry one, the receiver who received Alice's qubit has a higher probability of successful cheat compared with the party who have not.
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An experimentally feasible scheme for implementing four-atom quantum dense coding of an atom–cavity system is proposed. The cavity is only virtually excited and no quantum information will be transferred from the atoms to the cavity. Thus the scheme is insensitive to cavity decay and the thermal field. In the scheme, Alice can send faithfully 4 bits of classical information to Bob by sending two qubits. Generalized Bell states can be exactly distinguished by detecting the atomic state, and quantum dense coding can be realized in a simple way.