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Quantum Optics: Past, Present, Future

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Quantum Information".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 2308

Special Issue Editor


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Guest Editor
Center for Photon Information Processing, and School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
Interests: quantum nonlinear optics; photon information; quantum correlations; quantum sensors

Special Issue Information

Dear Colleagues,

Over the last millennium, quantum optics has made huge progress in both science and engineering fields. In science, quantum nonlinear optics in atomic and optical physics has been driven towards new phenomena such as electromagnetically induced transparency, ultraslow light, stop light, photon echoes, and quantum memories via atom–field interactions. In engineering fields, various quantum technologies have also been developed, where quantum information has drawn particular attraction in quantum computing, quantum communications, and quantum metrology. Based on the complementarity theory, quantum information has mostly dealt with the particle nature of quantum mechanics. The fundamental aspect of the particle nature is in the two-photon correlation such as anticorrelation, the so-called Hong–Ou–Mandel effect, and Bell inequality violation. In experiments, nonclassical light from nonlinear optical processes such as spontaneous parametric down conversion and squeezed light have been mostly used as quantum light sources. Nondeterminacy has been a central concept in quantum information. In this Special Issue, we focus on both the fundamental physics of quantum optics which has progressed over the last hundred years. For this, both review and research papers are invited from the quantum optics community. The following subjects are open to the Special Issue: General quantum mechanics, EPR/Bell inequality violation, two-photon correlation, quantum interface, quantum memory, quantum logic gate, quantum key distribution, quantum computing, quantum systems, quantum sensing and metrology, and emerging quantum optics.

Prof. Dr. Byoung S. Ham
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 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

General quantum mechanics;
EPR/Bell inequality violation;
two-photon correlation;
quantum interface;
quantum memory;
quantum logic gate;
quantum key distribution;
quantum computing;
quantum systems;
quantum sensing and metrology;
emerging quantum optics;

Published Papers (2 papers)

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Research

12 pages, 364 KiB  
Article
Integrated Multiresonator Quantum Memory
by Nikolay Sergeevich Perminov and Sergey Andreevich Moiseev
Entropy 2023, 25(4), 623; https://doi.org/10.3390/e25040623 - 06 Apr 2023
Viewed by 925
Abstract
We develop an integrated efficient multiresonator quantum memory scheme based on a system of three interacting resonators coupled through a common resonator to an external waveguide via switchable coupler. It is shown that high-precision parameter matching based on step-by-step optimization makes it possible [...] Read more.
We develop an integrated efficient multiresonator quantum memory scheme based on a system of three interacting resonators coupled through a common resonator to an external waveguide via switchable coupler. It is shown that high-precision parameter matching based on step-by-step optimization makes it possible to efficiently store the signal field and enables on-demand retrieval of the signal at specified time moments. Possible experimental implementations and practical applications of the proposed quantum memory scheme are discussed. Full article
(This article belongs to the Special Issue Quantum Optics: Past, Present, Future)
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9 pages, 2126 KiB  
Article
Analysis of Imperfect Rephasing in Photon Echo-Based Quantum Memories
by Byoung S. Ham
Entropy 2022, 24(10), 1367; https://doi.org/10.3390/e24101367 - 27 Sep 2022
Viewed by 966
Abstract
Over the last two decades, quantum memories have been intensively studied for potential applications of quantum repeaters in quantum networks. Various protocols have also been developed. To satisfy no noise echoes caused by spontaneous emission processes, a conventional two-pulse photon-echo scheme has been [...] Read more.
Over the last two decades, quantum memories have been intensively studied for potential applications of quantum repeaters in quantum networks. Various protocols have also been developed. To satisfy no noise echoes caused by spontaneous emission processes, a conventional two-pulse photon-echo scheme has been modified. The resulting methods include double-rephasing, ac Stark, dc Stark, controlled echo, and atomic frequency comb methods. In these methods, the main purpose of modification is to remove any chance of a population residual on the excited state during the rephasing process. Here, we investigate a typical Gaussian rephasing pulse-based double-rephasing photon-echo scheme. For a complete understanding of the coherence leakage by the Gaussian pulse itself, ensemble atoms are thoroughly investigated for all temporal components of the Gaussian pulse, whose maximum echo efficiency is 26% in amplitude, which is unacceptable for quantum memory applications. Full article
(This article belongs to the Special Issue Quantum Optics: Past, Present, Future)
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