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Applied Sciences
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Quantum Optics and Quantum Information Processing 2018
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Quantum Optics and Quantum Information Processing 2018

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Quantum Science and Technology".

Deadline for manuscript submissions: closed (30 April 2019) | Viewed by 14331

Special Issue Editor

Prof. Dr. Yongmin Li

E-Mail Website
Guest Editor
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
Interests: quantum optics; quantum information

Special Issue Information

Dear Colleagues,

Quantum optics studies the behavior and interactions of light and matter in terms of quantum mechanics. Quantum information science deals with the information processing tasks using quantum systems and enables the performance of specific tasks that are unachievable in a classical context. The last two decades have seen the impressive development of these two closely-related fields, both in theory and in experiments. This Special Issue of Applied Sciences will focus on new and important results in the field of Quantum Optics and Quantum Information science, as well as comprehensive review on recent key progress in this area. Topics of interest include, but are not limited to, theoretical and experimental research in quantum state engineering, quantum cryptography and communications, quantum imaging and metrology, quantum simulation and computation.

Prof. Dr. Yongmin Li
Guest Editor

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. Applied Sciences is an international peer-reviewed open access semimonthly 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.

Published Papers (5 papers)

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Research

9 pages, 1442 KiB  
Article
Transferring of Continuous Variable Squeezed States in 20 km Fiber
by Jiliang Qin, Jialin Cheng, Shaocong Liang, Zhihui Yan, Xiaojun Jia and Kunchi Peng
Appl. Sci. 2019, 9(12), 2397; https://doi.org/10.3390/app9122397 - 12 Jun 2019
Cited by 3 | Viewed by 2075
Abstract
Transferring of a real quantum state in a long-distance channel is an important task in the development of quantum information networks. For greatly suppressing the relative phase fluctuations between the signal beam and the corresponding local oscillator beam, the usual method is to [...] Read more.
Transferring of a real quantum state in a long-distance channel is an important task in the development of quantum information networks. For greatly suppressing the relative phase fluctuations between the signal beam and the corresponding local oscillator beam, the usual method is to transfer them with time-division and polarization-division multiplexing through the same fiber. But the nonclassical states of light are very sensitive to the channel loss and extra noise, this multiplexing method must bring the extra loss to the quantum state, which may result in the vanishing of its quantum property. Here, we propose and realize a suitable time multiplexing method for the transferring and measurement of nonclassical states. Only the local oscillator beam is chopped into a sequence of light pulses and transmitted through fiber with continuous orthogonal-polarized signal beam. Finally, when the local oscillator pulses are properly time delayed compared to the signal beam, the quantum state can be measured in the time sequences without the influence of extra noise in the fiber. Our work provides a feasible scheme to transfer a quantum state in relative long distance and construct a practical quantum information network in metropolitan region. Full article
(This article belongs to the Special Issue Quantum Optics and Quantum Information Processing 2018)
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9 pages, 701 KiB  
Article
Utilizing Sequential Control Scheme to Stabilize Squeezed Vacuum States
by Long Tian, Xiaocong Sun, Qingwei Wang, Jinrong Wang, Wenxiu Yao, Junping Wang, Yaohui Zheng and Kunchi Peng
Appl. Sci. 2019, 9(9), 1861; https://doi.org/10.3390/app9091861 - 07 May 2019
Viewed by 2278
Abstract
We report on a sequential control scheme to realize a steady, quasi-continuous output of squeezed vacuum states, which eliminates the influence of the seed beam on the squeezing strength. The scheme, originating from time-division multiplexing, separates the generation process from the locking process. [...] Read more.
We report on a sequential control scheme to realize a steady, quasi-continuous output of squeezed vacuum states, which eliminates the influence of the seed beam on the squeezing strength. The scheme, originating from time-division multiplexing, separates the generation process from the locking process. We confirm that the sequential control scheme does not reduce the squeezing strength and that the setup operates stably for a 3-h running test, with a duty ratio of 80% and cycle time of 5 s. Therefore, the sequential control scheme opens up a new path of manipulating squeezed vacuum states. Full article
(This article belongs to the Special Issue Quantum Optics and Quantum Information Processing 2018)
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10 pages, 4201 KiB  
Article
Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center
by Yebing Wang, Xiaotong Lu, Benquan Lu, Dehuan Kong and Hong Chang
Appl. Sci. 2018, 8(11), 2194; https://doi.org/10.3390/app8112194 - 08 Nov 2018
Cited by 12 | Viewed by 4148
Abstract
We review recent experimental progress concerning the 87Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the 87Sr clock transition for the optical lattice clock was performed, and closed-loop operation of the optical lattice clock [...] Read more.
We review recent experimental progress concerning the 87Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the 87Sr clock transition for the optical lattice clock was performed, and closed-loop operation of the optical lattice clock was realized. A fractional frequency instability of 2.8 × 10−17 was attained for an averaging time of 2000 s. The Allan deviation is found to be 1.6 × 10−15/τ1/2 and is limited mainly by white-frequency-noise. The Landé g-factors of the (5s2)1S0 and (5s5p)3P0 states in 87Sr were measured experimentally; they are important for evaluating the clock’s Zeeman shifts. We also present recent work on the miniaturization of the strontium optical lattice clock for space applications. Full article
(This article belongs to the Special Issue Quantum Optics and Quantum Information Processing 2018)
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12 pages, 1912 KiB  
Article
Performance Analysis of Continuous-Variable Quantum Key Distribution with Multi-Core Fiber
by Fei Li, Hai Zhong, Yijun Wang, Ye Kang, Duan Huang and Ying Guo
Appl. Sci. 2018, 8(10), 1951; https://doi.org/10.3390/app8101951 - 17 Oct 2018
Cited by 4 | Viewed by 2745
Abstract
Performance analysis of continuous-variable quantum key distribution (CVQKD) has been one of the focuses of quantum communications. In this paper, we propose an approach to enhancing the secret rate of CVQKD with the multi-core fiber (MCF) system that transmits multiple spatial modes simultaneously. [...] Read more.
Performance analysis of continuous-variable quantum key distribution (CVQKD) has been one of the focuses of quantum communications. In this paper, we propose an approach to enhancing the secret rate of CVQKD with the multi-core fiber (MCF) system that transmits multiple spatial modes simultaneously. The excess noise contributed by the inter-core crosstalk between cores can be effectively suppressed by quantum channel wavelength management, leading to the performance improvement of the MCF-based CVQKD system. In the security analysis, we perform numerical simulations for the Gaussian-modulated coherent state CVQKD protocol, considering simultaneously the extra insert loss of fan-in/fan-out (FIFO), which is the extra optical device that should be used at the input and the output of the fiber. Simulation results show that the performance of the one-way and two-way protocols for each core are slightly degraded because of the insert loss of the FIFO, but the total secret key rate can be increased, whereas the performance of the measurement-device-independent CVQKD protocol will be degraded due to the effect of the insert loss of the FIFO. These results may provide theoretical foundation for the space-division multiplexing CVQKD system. Full article
(This article belongs to the Special Issue Quantum Optics and Quantum Information Processing 2018)
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12 pages, 934 KiB  
Article
Multipartite Continuous Variable Quantum Conferencing Network with Entanglement in the Middle
by Zhaoyuan Zhang, Ronghua Shi and Ying Guo
Appl. Sci. 2018, 8(8), 1312; https://doi.org/10.3390/app8081312 - 07 Aug 2018
Cited by 8 | Viewed by 2564
Abstract
We suggest a continuous variable quantum conferencing network scheme with an entangled source in the middle. Here, the source generates a multipartite entangled state and distributes the modes of the state to an arbitrary number of legitimate network users. The entangled modes that [...] Read more.
We suggest a continuous variable quantum conferencing network scheme with an entangled source in the middle. Here, the source generates a multipartite entangled state and distributes the modes of the state to an arbitrary number of legitimate network users. The entangled modes that were received and measured by the users share mutual information, which is utilized to generate secure conferencing key between users. The scheme is proven secure against collective attacks on both the untrusted source in the middle and all the quantum links. Simulation results show that the presented scheme can achieve high rate secure conferencing for 100 users within a 400 m-radius community or factory area. Full article
(This article belongs to the Special Issue Quantum Optics and Quantum Information Processing 2018)
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