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한국멀티미디어학회 국제학술대회

Quantum secure direct communication via tripartite entanglement and local operation

Ya Hong Wang, He San Song, Hong Wei Liaong

Published Jul 1, 2006• 0 citations
OpenAlex

Abstract

A protocol is proposed to fulfill quantum secure direct communication via swapping entanglement and local operation. Based on the scheme, we discuss something about the utilization of resource and the security of communication. We find that it is absolutely secure to transmit classical information using the scheme proposed. But the average amount of information loaded by each qubit is invariable, although the qubits' amount belonged to a maximally entanglement state is different. By using this scheme can we also improve the communicating efficiency.

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A protocol is proposed to fulfill quantum secure direct communication via swapping entanglement and local operation. Based on the scheme, we discuss something about the utilization of resource and the security of communication. We find that it is absolutely secure to transmit classical information using the scheme proposed. But the average amount of information loaded by each qubit is invariable, although the qubits' amount belonged to a maximally entanglement state is different. By using this scheme can we also improve the communicating efficiency.
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.
We present a deterministic secure direct communication scheme via entanglement swapping, where a set of ordered maximally entangled three-particle states (GHZ states), initially shared by three spatially separated parties, Alice, Bob and Charlie, functions as a quantum information channel. After ensuring the safety of the quantum channel, Alice and Bob apply a series local operations on their respective particles according to the tripartite stipulation and the secret message they both want to send to Charlie. By three Alice, Bob and Charlie's Bell measurement results, Charlie is able to infer the secret messages directly. The secret messages are faithfully transmitted from Alice and Bob to Charlie via initially shared pairs of GHZ states without revealing any information to a potential eavesdropper. Since there is not a transmission of the qubits carrying the secret message between any two of them in the public channel, it is completely secure for direct secret communication if perfect quantum channel is used.
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 propose a direct communication protocol using entanglement swapping. The safety of this protocol is guaranteed by the basic properties of entanglement swapping. This protocol is efficient to transmit two classical bits of information per one session. This efficiency is better than that of ping-pong protocol suggested by Bostrom and Felbinger. Even if an eavesdropper intervenes in midway, the eavesdropper will be detected with the probability of in the verification process of one bit. Therefore the perfect security is guaranteed if we use enough amount of bits for the verification process.