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Quantum communication based on two-mode entangled state with quantum noise locking method

Shuhong Hao, Dong Wang, Xianshan Huang

Published May 15, 2018• 0 citations
Publisher

Abstract

The two-mode entangled state is an important basic non-classical state and it has been used in many quantum communication projects. We propose a new quantum communication scheme with a two-mode entangled state which can transmit signals encoded by a thermal-state light field. Also, instead of locking several phases in the whole process, we use only one locking servo system at the final stage. The locking error signal comes from the measured quantum variances by using the quantum noise locking method. A proof-of-principle derivation shows that it is very convenient to achieve the secure condition against individual attacks. It would be utilized in practical quantum information process.

DOI
10.1364/oe.26.013841

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The two-mode entangled state is an important basic non-classical state and it has been used in many quantum communication projects. We propose a new quantum communication scheme with a two-mode entangled state which can transmit signals encoded by a thermal-state light field. Also, instead of locking several phases in the whole process, we use only one locking servo system at the final stage. The locking error signal comes from the measured quantum variances by using the quantum noise locking method. A proof-of-principle derivation shows that it is very convenient to achieve the secure condition against individual attacks. It would be utilized in practical quantum information process.
We propose a scheme for quantum cryptography that uses the squeezing phase of a two-mode squeezed state to transmit information securely between two parties. The basic principle behind this scheme is the fact that each mode of the squeezed field by itself does not contain any information regarding the squeezing phase. The squeezing phase can only be obtained through a joint measurement of the two modes. This, combined with the fact that it is possible to perform remote squeezing measurements, makes it possible to implement a secure quantum communication scheme in which a deterministic signal can be transmitted directly between two parties while the encryption is done automatically by the quantum correlations present in the two-mode squeezed state.
This paper proposes a novel communication protocol leveraging multi-particle entanglement for non-classical information transmission. The core of the protocol resides in a carefully designed encoding scheme utilizing multi-variable entangled states to mitigate the impact of quantum decoherence and achieve information transfer rates exceeding the classical channel capacity. We introduce a multi-variable entangled state based error correction coding mechanism, combined with quantum decoherence theory, providing a scalable error correction strategy. The protocol focuses on precise control of entangled state utilization and minimizing errors in non-classical communication, offering a potentially scalable solution. The key mathematical formulation explores the encoding process, error detection, and correction stages, highlighting the role of entangled correlations in recovering the transmitted information. This work contributes to the advancement of quantum communication by providing a robust and scalable approach to non-classical information transfer. ---
Abstract Quantum communication is a new emerging inter-discipline in which classical communication theory and quantum mechanics are intertwined. Among them, the utilization of quantum entangled state properties is fundamental to the realization of quantum communication. In this way, we can ensure the security and confidentiality of information during transmission based on a new communication scheme, i.e., a quantum dense coding scheme. It enables the transmission of two bits of classical information by transmitting only one qubit. In the past decades, the scheme has attracted the attention of many researchers because of its promising development. In this paper, on top of quantum mechanics, we first review the two-dimensional dense coding scheme and analyze the process implemented by the above scheme. Then it is successfully extended to higher dimensions (three dimensions), predicting the possibility of implementation in more than two dimensions. Finally, the importance of the maximally entangled state for the transmission of this scheme is briefly explained.
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.
The possibility is explicitly shown that the average probability of error is reduced and the transmission rate of information is enhanced by means of entangled input states to a communication channel. When two senders transmit some information to a receiver, they encode the information in the quadrature amplitudes of both modes of a two-mode squeezed vacuum state. The receiver performs a simultaneous measurement of the two quadrature amplitudes of the received two-mode state. In this case, if the average value of the photon number supplied to the communication system is not so small, the average probability of error becomes smaller than that of the communication system without entanglement. Furthermore, the transmission rate of information becomes larger than the quantum capacity of classical information of the communication system without entanglement.
Quantum entanglement, a fundamental aspect of quantum mechanics, holds immense potential for secure communication. However, practical applications of quantum communication face significant challenges related to decoherence and eavesdropping. This paper explores the use of quantum entanglement for information encoding, focusing on a novel dynamic entanglement modulation scheme. We propose a method that leverages the inherent non-linearity of entangled states to create a resilient encoding system. The core mechanism involves precisely controlling the strength and phase of entangled states, enabling dynamic information modulation and ultimately enhancing the security of quantum communication. This research addresses a critical gap in current quantum communication protocols by introducing a fundamentally new approach to information protection. The results demonstrate a significant improvement in security against known attacks, validating the proposed dynamic entanglement modulation approach as a viable pathway for robust quantum communication.