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IEEE International Conference on Nanotechnology (IEEE-NANO)

An efficient controlled bidirectional quantum secure direct communication by using only EPR pairs

Yao–Hsin Chou, Fang-Jhu Lin, Guo-Jyun Zeng, Ting-Hui Chu

Published Aug 1, 2013• 3 citations
Publisher

Abstract

This paper proposes a bidirectional quantum secure direct communication protocol with a controller, who assists the users in making sure both sides could receive the other's secret messages simultaneously during the transmission. This protocol is based on Einstein-Podolsky-Rosen (EPR) pairs. If any eavesdropper tries to steal dealer's messages, the lawful participants will perceive it and abort their transmission.

DOI
10.1109/nano.2013.6720932

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This paper proposes a bidirectional quantum secure direct communication protocol with a controller, who assists the users in making sure both sides could receive the other's secret messages simultaneously during the transmission. This protocol is based on Einstein-Podolsky-Rosen (EPR) pairs. If any eavesdropper tries to steal dealer's messages, the lawful participants will perceive it and abort their transmission.
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A protocol for quantum secure direct communication using blocks of Einstein-Podolsky-Rosen (EPR) pairs is proposed. A set of ordered N EPR pairs is used as a data block for sending secret message directly. The ordered N EPR set is divided into two particle sequences, a checking sequence and a message-coding sequence. After transmitting the checking sequence, the two parties of communication check eavesdropping by measuring a fraction of particles randomly chosen, with random choice of two sets of measuring bases. After insuring the security of the quantum channel, the sender Alice encodes the secret message directly on the message-coding sequence and sends them to Bob. By combining the checking and message-coding sequences together, Bob is able to read out the encoded messages directly. The scheme is secure because an eavesdropper cannot get both sequences simultaneously. We also discuss issues in a noisy channel.
We present a quantum secure direct communication scheme achieved by swapping quantum entanglement. In this scheme a set of ordered Einstein-Podolsky-Rosen (EPR) pairs is used as a quantum information channel for sending secret messages directly. After insuring the safety of the quantum channel, the sender Alice encodes the secret messages directly by applying a series local operations on her particles sequence according to their stipulation. Using three EPR pairs, three bits of secret classical information can be faithfully transmitted from Alice to remote Bob without revealing any information to a potential eavesdropper. By both Alice and Bob's GHZ state measurement results, Bob is able to read out the encoded secret messages directly. The protocol is completely secure if perfect quantum channel is used, because there is not a transmission of the qubits carrying the secret message between Alice and Bob in the public channel.
We present a quantum secure direct communication scheme achieved by swapping quantum entanglement. In this scheme a set of ordered Einstein-Podolsky-Rosen (EPR) pairs is used as a quantum information channel for sending secret messages directly. After insuring the safety of the quantum channel, the sender Alice encodes the secret messages directly by applying a series local operations on her particle sequences according to their stipulation. Using three EPR pairs, three bits of secret classical information can be faithfully transmitted from Alice to remote Bob without revealing any information to a potential eavesdropper. By both Alice and Bob's GHZ state measurement results, Bob is able to read out the encoded secret messages directly. The protocol is completely secure if perfect quantum channel is used, because there is not a transmission of the qubits carrying the secret message between Alice and Bob in the public channel.