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International Journal of Quantum Information

QUANTUM DIRECT COMMUNICATION BASED ON QUANTUM SEARCH ALGORITHM

Chuan Xi Wang, Liang Hao, Si Yu Song, GUI LU LONG

Published Apr 1, 2010• 41 citations
Publisher

Abstract

Quantum direct communications, including deterministic secure quantum communication and quantum secure direct communication protocol using two-qubit quantum search algorithm are proposed in this paper. Secret messages are encoded by two-qubit unitary operations and exchanged by the two communication parties directly. We discussed the security of the protocol under intercept-resend attack and individual attack. We found that the protocols are secure against eavesdropping attacks.

DOI
10.1142/s0219749910006071

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Quantum direct communications, including deterministic secure quantum communication and quantum secure direct communication protocol using two-qubit quantum search algorithm are proposed in this paper. Secret messages are encoded by two-qubit unitary operations and exchanged by the two communication parties directly. We discussed the security of the protocol under intercept-resend attack and individual attack. We found that the protocols are secure against eavesdropping attacks.
A controlled quantum secure direct communication protocol based on four-qubit cluster states and quantum search algorithm is put forward, in which four users, a sender, a receiver and two controllers, are involved in achieving the secure transmission of secret message. The four-qubit cluster state can ensure the feasibility and security of the protocol because of its large persistency of entanglement. Meanwhile, the idea of quantum search algorithm is used to accomplish the task of encoding and decoding secret message. The proposed protocol can successfully avoid the information leakage problem and resist some common attacks including the outsider attacks and the internal attacks, and its qubit efficiency is up to 20%. Furthermore, compared with the previous quantum secure direct communication protocols, it can effectively resist the attacks from the dishonest receiver.
A novel two-party quantum secure direct communication protocol was proposed.By using ordered four-particle W state as carrier of information,encoding the secret message with unitary transformation,we can directly transmit secret message with local Bell-basis measurement and classical communication.In ideal channel,the protocol is secure against incoherent attack.The advantage of this scheme is that using W state is more little than GHZ state in energy loss and no quantum bit carrying secret message is transmitted in quantum channel.
This paper proposes the protocol of Quantum Secure Direct Communization (QSDC) based on the secret initial Bell states which are shared by two legitimate communicators. Then, we analyze the security of the protocol against the intercept-and-resend attack and individual attack. It is unnecessary for the scheme to make odd particles especially which is used for detection of eavesdropping. Instead, it extracts some particles for detection from the travel sequence carrying secret messages. The results show that this protocol is secure and the information will not be leaked out even if the communication is forced to interrupt for eavesdropping.
We present a new quantum secure direct communication protocol with three-particle entangled state. The communication parties utilize decoy photons to check eavesdropping. The sender encodes the secret message with unitary transformation, we can directly transmit secret message with Bell-basis measurement and Z-basis measurement. The protocol is efficient in that all entangled states are used to transmit the secret message and two bits message can be transmitted one time, the preparation of three-particle entangled state is realized technique, the protocol is feasible to operate. The protocol is also verified to be secure for a noise quantum channel.
These days, quantum secret communication algorithms different from quantum key distribution protocol have been proposed, which are called quantum secure direct communication protocols. These do not aim to have a key agreement between two communicators, but, to send a secret message directly using quantum devices. In this paper, we propose a new quantum secret direct communication protocol which has advantages over the current ones and also discuss its security analysis against the man-in-the-middle attack.