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Physical Review A

Entanglement improvement via a quantum scissor in a realistic environment

Liyun Hu, M. Al-Amri, Zeyang Liao, Muhammad Suhail Zubairy

Published Nov 18, 2019• 36 citations
Publisher

Abstract

An efficient scheme for enhancing quantum state amplification and entanglement is proposed. In comparison to previous methods, the usage of quantum scissors leads to a higher probability of success, better robustness against decoherence, and an overall reduction of resources.
DOI
10.1103/physreva.100.052322

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We generalize the concept of optical state truncation and noiseless linear amplification to enable truncation of the Fock-state expansion of an optical state to higher order and to simultaneously amplify it using linear optics. The resulting generalized quantum scissors are more efficient for noiseless linear amplification than employing multiple scissors in parallel and are experimentally practical. As a particular example, we focus on a third-order scissor device and demonstrate advantages in terms of fidelity with the target state, probability of success, distillable entanglement, and the amount of non-Gaussianity introduced.
Quantum entanglement, a fundamental phenomenon in quantum mechanics, presents a unique opportunity to revolutionize information processing and communication. This paper explores the potential of leveraging quantum entanglement to enhance information transfer and computational capabilities, specifically focusing on strategies to improve efficiency and security. We outline a novel approach centered around manipulating entangled states to facilitate faster and more robust data transmission and offer a new avenue for advanced algorithmic design. The research delves into the core mechanisms involved, detailing how entanglement can be harnessed to overcome limitations inherent in classical systems, ultimately proposing a framework for significant advancements in quantum information technologies.
Entangled quantum states serve as a pivotal resource in quantum information processing, where the preparation of highly entangled quantum states is a core issue. In this paper, we propose a local displacement-based quantum scissor (LDQS) scheme to enhance the entanglement of the two-mode squeezed vacuum (TMSV) state. By introducing a local displacement operation in the traditional quantum scissor, the entanglement of the TMSV state is enhanced by approximately 75 % for low initial squeezing ( r = 0 . 2 ) conditions. Compared with the local squeezing-based quantum scissor scheme (Liu et al., 2022), the LDQS scheme eliminates the need for additional pumping and the use of inefficient nonlinear crystals, thereby simplifying the experimental procedure. Moreover, the LDQS scheme provides a greater enhancement in entanglement when both schemes are implemented with the same success probability. Finally, we also demonstrate that the LDQS operation can be used to enhance the entanglement of the TMSV state in lossy channels. These advantages suggest that our scheme shows promise for application in various quantum information tasks, including quantum metrology and quantum communication. • Enhancing entanglement with local displacement-based quantum scissor scheme. • The scheme is easier to implement than the local squeezing-based quantum scissor. • The scheme exhibits robustness against entanglement degradation.
Quantum entanglement, a cornerstone of quantum mechanics, offers unprecedented computational capabilities. However, harnessing entanglement for practical applications remains a significant challenge due to its inherent fragility and susceptibility to decoherence. This paper explores a novel approach to quantum entanglement enhancement utilizing an adaptive correction scheme. We present a fundamentally different algorithm that dynamically adjusts the strength of entangled states, mitigating decoherence and enabling more precise quantum computations. The core mechanism centers around a feedback loop that continuously monitors and corrects the entanglement, optimizing the system's performance. This approach contrasts with traditional, static entanglement manipulation techniques, offering a pathway towards more efficient and reliable quantum computation.