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Quantum secure direct communication without maximally entangled states

Xihan Li, Fu‐Guo Deng, Chunyan Li, Yu-Jie Liang, Ping Zhou, Hong-Yu Zhou

Published Jun 1, 2006• 4 citations
OpenAlex

Abstract

Two quantum secure direct communication schemes are proposed based on pure entangled states and $d$-dimensional single-photon states, respectively. In these two schemes, only single-photon measurements are required for the two authorized users and two practical quantum signal sources are used for carrying information, which makes the schemes more convenient than others in a practical application. Although each qubit can be read out after a transmission of additional classical information, it is unnecessary for the users to transmit qubits carrying the secret message, which will increase their bit rate and their security. The parties use decoy photons to check eavesdropping efficiently.

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Two quantum secure direct communication schemes are proposed based on pure entangled states and ddd-dimensional single-photon states, respectively. In these two schemes, only single-photon measurements are required for the two authorized users and two practical quantum signal sources are used for carrying information, which makes the schemes more convenient than others in a practical application. Although each qubit can be read out after a transmission of additional classical information, it is unnecessary for the users to transmit qubits carrying the secret message, which will increase their bit rate and their security. The parties use decoy photons to check eavesdropping efficiently.
Two deterministic secure quantum communication schemes are proposed, one based on pure entangled states and the other on ddd-dimensional single-photon states. In these two schemes, only single-photon measurements are required for the two authorized users, which makes the schemes more convenient than others in practical applications. Although each qubit can be read out after a transmission of additional classical bit, it is unnecessary for the users to transmit qubits double the distance between the sender and the receiver, which will increase their bit rate and their security. The parties use decoy photons to check eavesdropping efficiently. The obvious advantage in the first scheme is that the pure entangled source is feasible with present techniques.
We present a scheme for quantum secure direct communication with quantum encryption. The two authorized users use repeatedly a sequence of the pure entangled pairs (quantum key) shared for encrypting and decrypting the secret message carried by the traveling photons directly. For checking eavesdropping, the two parties perform the single-photon measurements on some decoy particles before each round. This scheme has the advantage that the pure entangled quantum signal source is feasible at present and any eavesdropper cannot steal the message.
This paper presents a scheme for quantum secure direct communication with quantum encryption. The two authorized users use repeatedly a sequence of the pure entangled pairs (quantum key) shared for encrypting and decrypting the secret message carried by the travelling photons directly. For checking eavesdropping, the two parties perform the single-photon measurements on some decoy particles before each round. This scheme has the advantage that the pure entangled quantum signal source is feasible at present and any eavesdropper cannot steal the message.
A quantum secure direct communication network scheme is proposed with quantum superdense coding and decoy photons. The servers on a passive optical network prepare and measure the quantum signal, i.e. a sequence of the d -dimensional Bell states. After confirming the security of the photons received from the receiver, the sender codes his secret message on them directly. For preventing a dishonest server from eavesdropping, some decoy photons prepared by measuring one photon in the Bell states are used to replace some original photons. One of the users on the network can communicate to any other one. This scheme has the advantage of high capacity, and it is more convenient than others as only a sequence of photons is transmitted in quantum line.