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Entanglement-based quantum communication prevents tracking the message sender

Michael Siomau

Published Aug 20, 2014• 0 citations
OpenAlex

Abstract

The possibility to attain the current position of the message sender without person's consent seriously compromises the secrecy of correspondence. Classical communication systems cannot guarantee the security of communication against unwanted tracking, because the sender must broadcast a signal to send a message. The source of the signal could be always located, at least in principle. Quantum communication, as we show here, enables sending the massage by local manipulations with pre-distributed entangled quantum systems and without transmitting any physical signal and, therefore, secure the sender's location.

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Entanglement-based quantum communication may prevent tracking the message sender

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The possibility of attaining current position of the message sender without person's consent seriously compromises the secrecy of correspondence. Classical communication systems cannot guarantee the security of communication against unwanted location tracking, because the sender must broadcast a signal at the moment of sending the message. The source of the signal could be always located, at least in principle. We show that quantum communication enables sending the message with pre-distributed entangled quantum systems, local weak measurements, time synchronization between the sender and the receiver and classical communication by the message receiver alone, therefore, physically securing the sender's location.

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The possibility to attain the current position of the message sender without person's consent seriously compromises the secrecy of correspondence. Classical communication systems cannot guarantee the security of communication against unwanted tracking, because the sender must broadcast a signal to send a message. The source of the signal could be always located, at least in principle. Quantum communication, as we show here, enables sending the massage by local manipulations with pre-distributed entangled quantum systems and without transmitting any physical signal and, therefore, secure the sender's location.
The possibility of attaining current position of the message sender without person's consent seriously compromises the secrecy of correspondence. Classical communication systems cannot guarantee the security of communication against unwanted location tracking, because the sender must broadcast a signal at the moment of sending the message. The source of the signal could be always located, at least in principle. We show that quantum communication enables sending the message with pre-distributed entangled quantum systems, local weak measurements, time synchronization between the sender and the receiver and classical communication by the message receiver alone, therefore, physically securing the sender's location.
We present the first quantum secure communication protocol for an anonymous receiver without the assistance of anonymous entanglement. In previous works, if a public sender wants to send quantum messages to a chosen receiver while protecting the identity of the receiver from others, all participants should cooperate first to construct the entanglement between the sender and the anonymous receiver. This is the most important process in anonymous quantum communications. With anonymous entanglement, the sender can communicate quantum messages to the anonymous receiver by applying teleportation protocols. In contrast, our protocol is novel and achieves communication of quantum messages directly from the public sender to the anonymous receiver based on the quantum one-time pad and current achievements. Notably, the anonymity of the receiver, as well as the privacy of the quantum messages, is perfectly protected with the exception of an exponentially small probability in our protocol.
We present a scheme for quantum communication, where a set of EPR pairs, initially shared by the sender Alice and the receiver Bob, functions as a quantum channel. After insuring the safety of the quantum channel, Alice applies local measurement on her particles of the EPR pairs and informs Bob the encoding classical information publicly. According to Alice's classical information and his measurement outcomes on the EPR pairs Bob can infer the secret messages directly. In this scheme, to transmit one bit secret message, the sender Alice only needs to send one bit classical information to the receiver Bob. We also show that this scheme is completely secure if perfect quantum channel is used.
The communication process of a secure relay system usually has two stages: source to relay, relay to destination. When the source is only equipped with one antenna, the information transmission is not secure during the first stage. In this paper, we propose a novel three-stage scheme to transmit confidential messages in an amplify-and-forward (AF) relay system. In the proposal, during the additional stage all the relays independently send artificial interference signals to the source. Then in the next stage, the sending signals of the source node are mixed with both the confidential messages and the interference signals received in the first stage. Finally the relays forward the hybrid signals to the destination node, and cancel the interference signals simultaneously. Since the sending signals are hybrid, all the three stages are secure in the proposed scheme, even when the eavesdropper is located very close to the source, positive secrecy rate of the system can still be achieved. Simulation results verify that the proposed scheme has much better near-field performance than the traditional secure relay communication schemes.