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arXiv:1101.3790 · Physical Review A

Entanglement-enhanced information transfer through strongly correlated systems and its application to optical lattices

Song Yang, Abolfazl Bayat, Sougato Bose

Published Aug 4, 2011• 23 citations
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Abstract

We show that the inherent entanglement of the ground state of strongly correlated systems can be exploited for both classical and quantum communications. Our strategy is based on a single-qubit rotation that encodes information in the entangled nature of the ground state. In classical communication, our mechanism conveys more than one bit of information in each shot, just as dense coding does, without demanding long-range entanglement. In our scheme for quantum communication, the quality is higher than the widely studied attaching scenarios. Moreover, we propose to implement this way of communication in optical lattices.

DOI
10.1103/physreva.84.020302

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We show that the inherent entanglement of the ground state of strongly correlated systems can be exploited for both classical and quantum communications. Our strategy is based on a single-qubit rotation that encodes information in the entangled nature of the ground state. In classical communication, our mechanism conveys more than one bit of information in each shot, just as dense coding does, without demanding long-range entanglement. In our scheme for quantum communication, the quality is higher than the widely studied attaching scenarios. Moreover, we propose to implement this way of communication in optical lattices.
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Dense coding is the seminal example of how entanglement can boost qubit communication, from sending one bit to sending two bits. This is made possible by projecting separate particles onto a maximally entangled basis. We investigate more general communication tasks, in both theory and experiment, and show that simpler measurements enable strong and sometimes even optimal entanglement-assisted qubit communication protocols. Using only partial Bell state analysers for two qubits, we demonstrate quantum correlations that cannot be simulated with two bits of classical communication. Then, we show that there exists an established and operationally meaningful task for which product measurements are sufficient for the strongest possible quantum predictions based on a maximally entangled two-qubit state. Our results reveal that there are scenarios in which the power of entanglement in enhancing quantum communication can be harvested in simple and scalable optical experiments.
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.
We exploit the inherent entanglement of the ground state of a spin chain with dimerized XXXXXX and XXZXXZXXZ Hamiltonians to investigate the entanglement generation between the ends of the chain. The strategy introduced by S. Yang, A. Bayat, and S. Bose [Phys. Rev. A 84, 020302(R) (2011)] is followed to encode the information in the entangled ground state of the system by local rotation. The amount of achieved entanglement in this scheme is higher than the one achieved when attaching a pair of maximally entangled spins to the system. Also, our proposal can be implemented by using the optical lattices.
This paper investigates a novel approach to information encoding and error correction leveraging the unique properties of quantum entanglement. The core claim is to construct an information encoding scheme based on entangled states, complemented by quantum error correction codes, to achieve high-efficiency information transmission and storage. The proposed mechanism utilizes multi-body quantum entanglement for encoding, exploiting the correlated nature of entangled states, alongside the development of a specialized quantum error correction code designed to specifically address errors within entangled states. The research demonstrates a potential pathway exceeding the limitations of classical encoding, offering the possibility of superluminal information transfer by directly utilizing the correlations inherent in entanglement and implementing targeted error correction. The theoretical framework presented provides a foundation for future research into scalable quantum communication and data storage systems. The key mathematical components explored include the density matrix formalism, Pauli operators, and the concepts of quantum error correction codes, specifically focusing on their application to entangled states. The primary objective is to establish a robust and efficient method for encoding and correcting information using quantum entanglement, a crucial step towards realizing practical quantum communication networks.
This paper proposes a novel approach to distributed memory systems leveraging quantum entanglement. We demonstrate how encoding information into entangled states of multiple qubits can enable long-range, high-capacity, and low-latency data storage and retrieval. The core mechanism involves exploiting the inherent correlations within entangled states for distributed storage and access. Furthermore, we introduce quantum error correction techniques to enhance the reliability of the system. This approach contrasts with traditional distributed memory systems reliant on classical communication, offering potential advantages in terms of bandwidth efficiency and data transfer speeds. The theoretical framework presented outlines the key components and considerations for realizing this quantum-based distributed memory architecture. We explore the limitations imposed by decoherence and propose strategies for mitigation. The ultimate goal is to establish a foundational understanding of this technology and pave the way for future research and development in quantum memory systems.