Article
Multidisciplinary Sciences
Mingjian He, Robert Malaney
Summary: In this study, a new CV-based teleportation protocol is explored to improve the transfer of hybrid entangled states. The modified protocol shows significant improvement over traditional CV teleportation for both DV qubits and CV qubits. Additionally, the use of non-Gaussian operations with quantum scissors provides the most improvement in loss tolerance.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Y. U. E. Qin, J. I. N. G. X. U. Ma, J. I. A. L. I. N. Cheng, Z. H. I. H. U. I. Yan, X. I. A. O. J. U. N. Jia
Summary: Quantum conference (QC) is a cryptographic task for secure communications among multiple users. The Greenberger-Horne-Zeilinger (GHZ) entangled state is used as the basic resource, and a continuous variable (CV) GHZ entangled state allows the establishment of an unconditional and efficient quantum network. An implementation of QC scheme using a CV multipartite GHZ entangled state is reported, where submodes of a quadripartite GHZ entangled state are distributed to four spatially separated users. The proposed QC scheme is secure against lossy quantum channels and collective Gaussian attacks.
PHOTONICS RESEARCH
(2023)
Article
Quantum Science & Technology
Zhennan Wen, Yougen Yi, Xiaowen Xu, Ying Guo
Summary: In this paper, a non-Gaussian approach using photon catalysis is proposed to improve the performance of continuous-variable quantum teleportation (CVQT). Numerical simulations show that this approach enhances the fidelity and maximal transmission distance of CVQT.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Xiao-Ting Chen, Lu-Ping Zhang, Shou-Kang Chang, Huan Zhang, Li-Yun Hu
Summary: In continuous variable quantum key distribution, performing photon addition operation on the left side of the entangled source shows higher success probability, better secure key rate, and transmission distance compared to photon subtraction on the right side, even with the same maximum tolerable noise.
Article
Optics
Qingwei Wang, Yajun Wang, Xiaocong Sun, Yuhang Tian, Wei Li, Long Tian, Xudong Yu, Jing Zhang, Yaohui Zheng
Summary: A universal scheme of a continuous variable quantum state distributor that performs point-to-multipoint distributions via quantum teleportation with partially disembodied transport is presented. Controllable distributions were demonstrated by manipulating the squeezing factor of EPR entanglement, leading to gradual changes in the fidelities of the receivers.
Article
Optics
Ludovico Lami
Summary: This paper investigates data hiding in continuous-variable quantum systems, analyzing the efficiency limits of data hiding under measurements implementable with local operations and classical communication, as well as data hiding against Gaussian operations assisted by measurement outcomes feedback. By performing a quantitative analysis of errors introduced by quantum teleportation protocol, the required squeezing and local detection efficiency for teleporting arbitrary multimode local states with known mean energy is determined.
Article
Optics
Shaoping Shi, Yajun Wang, Long Tian, Wei Li, Yimiao Wu, Qingwei Wang, Yaohui Zheng, Kunchi Peng
Summary: This article presents a fully connected continuous-variable quantum teleportation network architecture, where a squeezed state of light distributes entangled sideband modes to each communication link, offering potential for various tasks of quantum information processing.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Multidisciplinary
Liang Liu, Jinchuan Hou, Xiaofei Qi
Summary: A computable Gaussian quantum correlation is proposed in the paper, which is easily computed without measurements or optimizations. This correlation has attractive properties and can describe the same Gaussian correlation as Gaussian quantum discord and Gaussian geometric discord.
Article
Quantum Science & Technology
Yu Xiang, Shuheng Liu, Jiajie Guo, Qihuang Gong, Nicolas Treps, Qiongyi He, Mattia Walschaers
Summary: This study investigates the remote creation and distribution of Wigner negativity in the multipartite scenario. It provides an intuitive method to quantify remotely generated Wigner negativity in the context of photon subtraction, and paves the way for utilizing Wigner negativity as a valuable resource in quantum information protocols based on non-Gaussian scenarios.
NPJ QUANTUM INFORMATION
(2022)
Article
Optics
Federico Centrone, Frederic Grosshans, Valentina Parigi
Summary: We studied continuous-variable graph states with regular and complex network shapes, and analyzed the relationship between the cost, the number of squeezed modes, and the topology. We provided an analytical formula to compute the experimental resources needed, and showed that increasing homodyne measurements can boost entanglement and enhance the efficiency of entanglement routing protocol.
Article
Optics
Chandan Kumar, Shikhar Arora
Summary: In this article, we investigate the role of non-Gaussian operations in continuous-variable quantum teleportation. These operations can enhance the fidelity of teleportation, but they are probabilistic in nature. We optimize the balance between teleportation fidelity and success probability by tuning the transmissivity of beam splitters, which leads to significant improvement in fidelity.
Article
Quantum Science & Technology
Wei Ye, Ying Guo, Huan Zhang, Shoukang Chang, Ying Xia, Sha Xiong, Liyun Hu
Summary: We propose a theoretical scheme for generating a novel kind of non-Gaussian state by using coherent superposition of photon subtraction and addition on each mode of an input two-mode squeezed coherent state. The simulation results showed that the increase in coherent amplitudes of the CS-based TMSC is beneficial for improving the nonclassicality compared to the TMSC case. We also analyze the entanglement of the proposed CS-based TMSC and its applications in quantum teleportation. The proposed state demonstrates distinct advantages over other non-Gaussian states in terms of optimal entanglement and fidelity at small-initial squeezing ranges.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Optics
Yi-Hua Zhou, Shu-Fen Qin, Wei-Min Shi, Yu-Guang Yang
Summary: The proposed MDI-CVQKD protocol uses photon subtraction and noiseless linear amplifiers to improve the entanglement between quantum states, extending the transmission distance and enhancing the performance of key distribution system.
Article
Optics
Bo Lan, Hong-chun Yuan, Xue-xiang Xu
Summary: We studied the effect of delocalized single-photon addition on different input modes, generating entangled light states with more parameters and complex structures, characterized by increased Wigner negativity and even discorrelation.
Article
Optics
Liang Wu, Ting Chai, Yanhong Liu, Yaoyao Zhou, Jiliang Qin, Zhihui Yan, Xiaojun Jia
Summary: This article proposes a feasible scheme to distribute quadripartite entanglement using continuous-variable polarization states, enabling long-distance entanglement distribution in commercial optical fiber communication networks. Different types of polarization entangled states can be distributed by controlling the beam splitter network in the quantum server. The protocol provides important references for experimental implementation and metropolitan quantum networks.
