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Photonics
Special Issues
Quantum Optics: Entanglement and Coherence in Photonic Systems
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Quantum Optics: Entanglement and Coherence in Photonic Systems

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (15 December 2022) | Viewed by 10469

Special Issue Editors

Prof. Dr. Shengwang Du

E-Mail Website
Guest Editor
Department of Physics, The University of Texas at Dallas, 800 West Campbell Rd., Richardson, TX 75080, USA
Interests: atomic, molecular, and optical physics; quantum optics; quantum information science; quantum networks; optical neural networks; laser cooling and trapping; optical microscopy and imaging for material nanostructures and bioimaging
Prof. Dr. Yoon-Ho Kim

E-Mail Website
Guest Editor
Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
Interests: quantum interferometry; quantum imaging; quantum entanglement; quantum memory; stationary photons; weak quantum measurement; quantum tomography

Special Issue Information

Dear Colleagues,

Quantum optics has traditionally played important roles in probing the fundamental properties of quantum physics, such as entanglement and quantum coherence. Recently, with the advent of the second quantum revolution, quantum optics has been at the heart of quantum information technologies, such as quantum computing, quantum networks, and quantum metrology. These applied quantum technologies rely on the generation, manipulation, and measurement of quantum optical states of light, e.g., single photons, entanglement, and squeezing.

To echo the recent exciting development in quantum optics, we are launching a Special Issue of Photonics in the field of quantum optics: “Entanglement and Coherence in Photonic Systems”. We encourage you to submit your research work on both theoretical studies and experimental demonstrations.

Prof. Dr. Shengwang Du
Prof. Dr. Yoon-Ho Kim
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. Photonics 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

  • entanglement
  • coherence
  • decoherence
  • single-photon state
  • multiple-photon state
  • squeezing
  • quantum information
  • quantum computing
  • quantum networks
  • spontaneous parametric down-conversion
  • spontaneous four-wave mixing
  • quantum-state tomography
  • quantum measurement
  • weak measurement
  • non-Hermitian quantum optics

Published Papers (5 papers)

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Research

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10 pages, 366 KiB  
Communication
Tunable Transparency and Group Delay in Cavity Optomechanical Systems with Degenerate Fermi Gas
by Fatin Nadiah Yusoff, Muhammad Afiq Zulkifli, Norshamsuri Ali, Shailendra Kumar Singh, Nooraihan Abdullah, Nor Azura Malini Ahmad Hambali and Collins Okon Edet
Photonics 2023, 10(3), 279; https://doi.org/10.3390/photonics10030279 - 7 Mar 2023
Cited by 5 | Viewed by 1472
Abstract
We theoretically investigate the optical response and the propagation of an external probe field in a Fabry–Perot cavity, which consists of a mechanical mode of trapped, ultracold, fermionic atoms inside and simultaneously driven by an optical laser field. We investigate the electromagnetically-induced transparency [...] Read more.
We theoretically investigate the optical response and the propagation of an external probe field in a Fabry–Perot cavity, which consists of a mechanical mode of trapped, ultracold, fermionic atoms inside and simultaneously driven by an optical laser field. We investigate the electromagnetically-induced transparency due to coupling of the optical cavity field with the collective density excitations of the ultracold fermionic atoms via radiation pressure force. Moreover, we discuss the variations in the phase and group delay of the transmitted probe field with respect to effective cavity detuning as well as pumping power. It is observed that the transmitted field is lagging in this fermionic cavity optomechanical system. Our study shall provide a method to control the propagation as well as the speed of the transmitted probe field in this kind of fermionic, ultracold, atom-based, optomechanical cavity system, which might have potential applications in optical communications, signal processing and quantum information processing. Full article
(This article belongs to the Special Issue Quantum Optics: Entanglement and Coherence in Photonic Systems)
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13 pages, 2071 KiB  
Article
Prisoners’ Dilemma in a Spatially Separated System Based on Spin–Photon Interactions
by Azmi Ali Altintas, Fatih Ozaydin, Cihan Bayindir and Veysel Bayrakci
Photonics 2022, 9(9), 617; https://doi.org/10.3390/photonics9090617 - 30 Aug 2022
Cited by 2 | Viewed by 1285
Abstract
Having access to ideal quantum mechanical resources, the prisoners’ dilemma can be ceased. Here, we propose a distributed quantum circuit to allow spatially separated prisoners to play the prisoners’ dilemma game. Decomposing the circuit into controlled-Z and single-qubit gates only, we design a [...] Read more.
Having access to ideal quantum mechanical resources, the prisoners’ dilemma can be ceased. Here, we propose a distributed quantum circuit to allow spatially separated prisoners to play the prisoners’ dilemma game. Decomposing the circuit into controlled-Z and single-qubit gates only, we design a corresponding spin–photon-interaction-based physical setup within the reach of current technology. In our setup, spins are considered to be the players’ logical qubits, which can be realized via nitrogen-vacancy centers in diamond or quantum dots coupled to optical cavities, and the game is played via a flying photon realizing logic operations by interacting with the spatially separated optical cavities to which the spin qubits are coupled. We also analyze the effect of the imperfect realization of two-qubit gates on the game, and discuss the revival of the dilemma and the emergence of new Nash equilibria. Full article
(This article belongs to the Special Issue Quantum Optics: Entanglement and Coherence in Photonic Systems)
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11 pages, 6264 KiB  
Article
Decoherence-Induced Sudden Death of Entanglement and Bell Nonlocality
by Dong-Gil Im and Yoon-Ho Kim
Photonics 2022, 9(2), 58; https://doi.org/10.3390/photonics9020058 - 24 Jan 2022
Cited by 3 | Viewed by 2222
Abstract
Decoherence due to the unwanted interaction between a quantum system and environment leads to the degradation of quantum coherence. In particular, for an entangled state, decoherence makes a loss of entanglement and Bell nonlocality known as entanglement sudden death (ESD), and Bell nonlocality [...] Read more.
Decoherence due to the unwanted interaction between a quantum system and environment leads to the degradation of quantum coherence. In particular, for an entangled state, decoherence makes a loss of entanglement and Bell nonlocality known as entanglement sudden death (ESD), and Bell nonlocality sudden death (BNSD). Here, we theoretically investigate the entanglement and Bell nonlocality of a bipartite entangled state under three types of decoherence, amplitude damping, phase damping, and depolarizing. Our result provides the bound of decoherence strength that does not lose the entanglement and Bell nonlocality. In addition, we find two interesting features. One is that the entanglement can survive even though one of the entangled qubits is affected by a large strength of decoherence if the other qubit is affected by a small enough strength of decoherence except for the depolarizing. The second one is that when a specific form of entangled state is under amplitude damping, the Bell nonlocality shows an asymmetric behavior respect to the decoherence strengths on each qubit. Our work provides comprehensive information on ESD and BNSD for the bipartite entangled state which will be useful to implement quantum information processing in the presence of decoherence. Full article
(This article belongs to the Special Issue Quantum Optics: Entanglement and Coherence in Photonic Systems)
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8 pages, 348 KiB  
Communication
Hybrid Entanglement between Optical Discrete Polarizations and Continuous Quadrature Variables
by Jianming Wen, Irina Novikova, Chen Qian, Chuanwei Zhang and Shengwang Du
Photonics 2021, 8(12), 552; https://doi.org/10.3390/photonics8120552 - 3 Dec 2021
Cited by 6 | Viewed by 2590
Abstract
By coherently combining advantages while largely avoiding limitations of two mainstream platforms, optical hybrid entanglement involving both discrete and continuous variables has recently garnered widespread attention and emerged as a promising idea for building heterogenous quantum networks. In contrast to previous results, here [...] Read more.
By coherently combining advantages while largely avoiding limitations of two mainstream platforms, optical hybrid entanglement involving both discrete and continuous variables has recently garnered widespread attention and emerged as a promising idea for building heterogenous quantum networks. In contrast to previous results, here we propose a new scheme to remotely generate hybrid entanglement between discrete polarization and continuous quadrature optical qubits heralded by two-photon Bell-state measurement. As a novel nonclassical light resource, we further use it to discuss two examples of ways—entanglement swapping and quantum teleportation—in which quantum information processing and communications could make use of this hybrid technique. Full article
(This article belongs to the Special Issue Quantum Optics: Entanglement and Coherence in Photonic Systems)
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Review

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30 pages, 640 KiB  
Review
The Role of Auxiliary Stages in Gaussian Quantum Metrology
by Danilo Triggiani, Paolo Facchi and Vincenzo Tamma
Photonics 2022, 9(5), 345; https://doi.org/10.3390/photonics9050345 - 14 May 2022
Viewed by 2017
Abstract
The optimization of the passive and linear networks employed in quantum metrology, the field that studies and devises quantum estimation strategies to overcome the levels of precision achievable via classical means, appears to be an essential step in certain metrological protocols achieving the [...] Read more.
The optimization of the passive and linear networks employed in quantum metrology, the field that studies and devises quantum estimation strategies to overcome the levels of precision achievable via classical means, appears to be an essential step in certain metrological protocols achieving the ultimate Heisenberg-scaling sensitivity. This optimization is generally performed by adding degrees of freedom by means of auxiliary stages, to optimize the probe before or after the interferometric evolution, and the choice of these stages ultimately determines the possibility to achieve a quantum enhancement. In this work we review the role of the auxiliary stages and of the extra degrees of freedom in estimation schemes, achieving the ultimate Heisenberg limit, which employ a squeezed-vacuum state and homodyne detection. We see that, after the optimization for the quantum enhancement has been performed, the extra degrees of freedom have a minor impact on the precision achieved by the setup, which remains essentially unaffected for networks with a larger number of channels. These degrees of freedom can thus be employed to manipulate how the information about the structure of the network is encoded into the probe, allowing us to perform quantum-enhanced estimations of linear and non-linear functions of independent parameters. Full article
(This article belongs to the Special Issue Quantum Optics: Entanglement and Coherence in Photonic Systems)
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