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Symmetry
Special Issues
Symmetry in Quantum Optics and Quantum Information Research
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Special Issue "Symmetry in Quantum Optics and Quantum Information Research"

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 31 January 2024 | Viewed by 1237

Special Issue Editors

Prof. Dr. Hong Guo

E-Mail Website
Guest Editor
1. State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing 100871, China
2. Center for Quantum Information Technology, Peking University, Beijing 100871, China
Interests: quantum optics; quantum information technology; magnetometer; quantum time-frequency transfer; quantum key distribution; quantum open system
Dr. Ziyang Chen
E-Mail Website
Guest Editor
1. State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing 100871, China
2. Center for Quantum Information Technology, Peking University, Beijing 100871, China
Interests: quantum key distribution; quantum random number generation; quantum information theory
Special Issues, Collections and Topics in MDPI journals
Dr. Xiangyu Wang

E-Mail Website
Guest Editor
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Interests: quantum information; quantum cryptography; quantum key distribution; quantum random number generator; quantum network
Prof. Dr. Qiong Li

E-Mail Website
Guest Editor
School of Cyberspace Science, Faculty of Computing, Harbin Institute of Technology, Harbin 150080, China
Interests: quantum cryptography; quantum key distribution; discrete variable; information processing
Special Issues, Collections and Topics in MDPI journals
Dr. Bingjie Xu

E-Mail Website
Guest Editor
Science and Technology on Communication Security Laboratory, Institute of Southwestern Communication, Chengdu, China
Interests: quantum cryptography; quantum key distribution; quantum random number generation

Special Issue Information

Dear Colleagues,

Quantum measurement has the advantages of high accuracy, high sensitivity, wide response range, and easy integration, which will break the classical measurement limit. Quantum precision measurement and related quantum information technology improve the methods of information acquisition and transmission, providing potentials for experiments and applications with high precision, and open a pathway for large-scale and high-performance quantum networks.

In recent years, technologies, including atomic magnetometer, atomic clock, optical frequency comb, Rydberg atom, and quantum weak measurement, have greatly enriched high-precision measurement methods. Meanwhile, fields including quantum key distribution, quantum time–frequency transfer, and quantum ranging have enhanced information transmission. These studies not only bring excellent technical performances but also drive the development of next-generation metrological technologies. In fact, a lot of symmetries exist in quantum technologies.

This Special Issue aims to serve as a platform for the presentation of new and improved techniques of quantum precision measurement and related quantum information technology, as well as the symmetric properties of these fields. In particular, the theoretical or experimental investigation and improvement of quantum information technology and other extended topics fall within the scope of this Special Issue.

Prof. Dr. Hong Guo
Dr. Ziyang Chen
Dr. Xiangyu Wang
Prof. Dr. Qiong Li
Dr. Bingjie Xu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • atomic magnetometer
  • quantum time–frequency transfer
  • quantum key distribution
  • quantum open system
  • atomic clock
  • optical frequency comb
  • Rydberg atom
  • quantum weak measurement
  • quantum image
  • quantum information

Published Papers (2 papers)

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Article
Security Analysis of Imperfect Gaussian Modulation Caused by Amplitude Modulator in Continuous–Variable Quantum Key Distribution
by
Zhenghua Li
,
Xiangyu Wang
,
Ziyang Chen
,
Bingjie Xu
and
Song Yu
Symmetry 2023, 15(7), 1452; https://doi.org/10.3390/sym15071452 - 20 Jul 2023
Viewed by 422
Abstract
Continuous-variable quantum key distribution (CV–QKD) is a system that provides secret keys for symmetric key systems. In the application of CV–QKD, the practical security of the system is crucial. In this article, we investigate the practical security issues caused by non–ideal Gaussian modulation, [...] Read more.
Continuous-variable quantum key distribution (CV–QKD) is a system that provides secret keys for symmetric key systems. In the application of CV–QKD, the practical security of the system is crucial. In this article, we investigate the practical security issues caused by non–ideal Gaussian modulation, which is caused by fitting defects of the amplitude modulator’s (AM) modulation curve. We provide the effect of fitting error on parameter estimation. We also give the relationship between the fitting order and the secret key rate. The simulation results indicate that the system is completely unable to communicate during first–order fitting. During second–order fitting, the system’s performance decreases by more than half. During third–order fitting, the system’s performance will be consistent with the ideal. Therefore, to ensure the performance of the CV–QKD system, the fitting order must be at least three or higher. Full article
(This article belongs to the Special Issue Symmetry in Quantum Optics and Quantum Information Research)
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Article
High-Performance Intermediate-Frequency Balanced Homodyne Detector for Local Local Oscillator Continuous-Variable Quantum Key Distribution
by
Dengke Qi
,
Xiangyu Wang
,
Ziyang Chen
,
Yueming Lu
and
Song Yu
Symmetry 2023, 15(7), 1314; https://doi.org/10.3390/sym15071314 - 27 Jun 2023
Viewed by 557
Abstract
In the continuous-variable quantum key distribution (CV-QKD) system with a local local oscillator (LLO), the center frequency of the sender and the receiver’s source are not exactly the same and a certain frequency drift exists over time, resulting in the frequency of the [...] Read more.
In the continuous-variable quantum key distribution (CV-QKD) system with a local local oscillator (LLO), the center frequency of the sender and the receiver’s source are not exactly the same and a certain frequency drift exists over time, resulting in the frequency of the signal received near the intermediate frequency. Therefore, the LLO system needs an intermediate-frequency balanced homodyne detector (BHD), which needs better symmetry of the arms of the BHD, to obtain the less-common mode noise. Moreover, the traditional intermediate-frequency receiver in classical communication is not available in the CV-QKD system because of the low quantum-to-classical noise ratio. In view of this, in this paper, we construct a broadband intermediate-frequency BHD based on ratio frequency and integrated circuit technology, whose bandwidth can exceed 270 MHz and whose quantum-to-classical noise ratio can reach 14.9 dB. Meanwhile, the BHD has an excellent linear performance with a gain of 22.4 k. By adopting our intermediate-frequency BHD, the secret key rate of the pilot-sequential Gaussian modulated coherent state CV-QKD system with an LLO can reach over 430.8 kbps of 60 km at the standard fiber length, which paves the way to achieve a high-performance LLO CV-QKD system with intermediate-frequency BHD. Full article
(This article belongs to the Special Issue Symmetry in Quantum Optics and Quantum Information Research)
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