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Quantum Optics: Theory, Methods and Applications
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Quantum Optics: Theory, Methods and Applications

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

Deadline for manuscript submissions: 31 December 2024 | Viewed by 6959

Special Issue Editors

Prof. Dr. Jesús Liñares Beiras

E-Mail Website
Guest Editor
Applied Physics Department, University of Santiago de Compostela, E-15782 Santiago de Compostela, Galicia, Spain
Interests: quantum optics; integrated quantum photonics; fiber-optic and free-space quantum cryptography; interferometric optical spatial multiplexing
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Xesús Prieto Blanco

E-Mail Website
Guest Editor
Applied Physics Department, University of Santiago de Compostela, E-15782 Santiago de Compostela, Galicia, Spain
Interests: integrated optics; quantum photonics; fiber-optic and free-space quantum cryptography; ion-exchange in glass; interferometric optical spatial multiplexing; image spectrometers

Special Issue Information

Dear Colleagues,

Quantum optics is currently one of the most active fields in both fundamental and applied physics. In fact, quantum light states (i.e., photons) have been used successfully to test many of the counter-intuitive predictions of quantum mechanics, such as entanglement, teleportation, interaction-free measurement and so on, and provide very useful resources for quantum optical information science. In fact, the scientific community has recognized this achievement by awarding the Nobel Prize in Physics 2022 to A. Aspect, J. Clauser and A. Zeilinger “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science”. At present, great theoretical and technological efforts are being made to develop different applications based on quantum photonics—that is, exploiting the most technological part of quantum optics. Among others research fields we can highlight the study, development and testing of quantum optical protocols and systems for QKD and quantum optical communications, the study of discrete and continuous variable methods for quantum processing, the design and experimental implementation of quantum optical processors for computing and/or analog simulation, the development of methods and devices for quantum optical metrology and sensors, and so on.

This Special Issue aims to produce an updated overview of this exciting and broad field, reviewing the current state-of-the-art and presenting perspectives of further development. We seek contributions related to theoretical and fundamental aspects of quantum light, mathematical and experimental methods for the design, implementation and characterization of quantum optical (photonic) devices, and to applications in quantum optical computing, quantum cryptography, quantum optical metrology, quantum optical sensors, quantum optical imaging etc.

Original research papers in all areas of the theory, mathematical and experimental methods and applications of quantum optics will be considered, including but not limited to:

  • Coherent states and squeezed states;
  • Quantum superpositions, entanglement and decoherence;
  • Continuous variables and applications;
  • Phase space methods and quantum tomography;
  • Nonlinear quantum optics;
  • Optical quantum information processing;
  • Fiberbased and freespace QKD systems;
  • Bulk and integrated devices for quantum optical information;
  • Materials for quantum optics;
  • Photonnumberresolving detectors;
  • Homodyne detection and other detection techniques;
  • Analog quantum simulators;
  • Quantum optical interference and imaging;
  • Quantum optical metrology and sensors.

Prof. Dr. Jesús Liñares Beiras
Prof. Dr. Xesús Prieto Blanco
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. 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.

Keywords

  • optical quantum states
  • quantum optical information
  • quantum key distribution
  • quantum optical communications
  • quantum optical processing
  • quantum optical measurement
  • quantum metrology
  • quantum sensing
  • quantum imaging
  • quantum interference
  • photonic integrated circuits
  • optical fibers
  • nonlinear optics
  • optical materials

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Published Papers (6 papers)

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Research

19 pages, 4889 KiB  
Article
Corner Reflector Plasmonic Nanoantennas for Enhanced Single-Photon Emission
by Pedro Chamorro-Posada
Appl. Sci. 2024, 14(22), 10300; https://doi.org/10.3390/app142210300 - 9 Nov 2024
Viewed by 419
Abstract
The emission rate of atom-like photon sources can be significantly improved by coupling them to plasmonic resonant nanostructures. These arrangements function as nanoantennas, serving the dual purpose of enhancing light–matter interactions and decoupling the emitted photons. However, there is a contradiction between the [...] Read more.
The emission rate of atom-like photon sources can be significantly improved by coupling them to plasmonic resonant nanostructures. These arrangements function as nanoantennas, serving the dual purpose of enhancing light–matter interactions and decoupling the emitted photons. However, there is a contradiction between the requirements for these two tasks. A small resonator volume is necessary for maximizing interaction efficiency, while a large antenna mode volume is essential to achieve high emission directivity. In this work, we analyze a hybrid structure composed of a noble metal plasmonic resonant nanoparticle coupled to the atom-like emitter, which is designed to enhance the emission rate, alongside a corner reflector aimed at optimizing the angular distribution of the emitted photons. A comprehensive numerical study of silver and gold corner reflector nanoantennas, employing the finite difference time domain method, is presented. The results demonstrate that a well-designed corner reflector can significantly enhance photon emission directivity while also substantially boosting the emission rate. Full article
(This article belongs to the Special Issue Quantum Optics: Theory, Methods and Applications)
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10 pages, 348 KiB  
Article
Quantum Noise: Particles, Waves and Mixture
by Leonardo López-Hernández, Diego Alberto Lara-Bustillos, Guillermo de Jesús Rojas-Prado, Josué Cantera, Edna M. Hernández, Jehú López-Aparicio, Carlos Ernesto Vargas and Víctor Velázquez
Appl. Sci. 2024, 14(20), 9382; https://doi.org/10.3390/app14209382 - 15 Oct 2024
Viewed by 492
Abstract
We carry out a theoretical investigation about quantum noise in coherent mixtures of states with different statistics. On the one hand, we investigate the dependence between the behavior wave-particle and associated noise. On the other hand, we are interested in studying the persistence [...] Read more.
We carry out a theoretical investigation about quantum noise in coherent mixtures of states with different statistics. On the one hand, we investigate the dependence between the behavior wave-particle and associated noise. On the other hand, we are interested in studying the persistence of chaotic behavior in mixtures of states with quantum and classical behavior. For this, we perform mixtures of single photons with coherent states of different averages. We find that the noise associated with quantum chaos depends on the proportion of the quantum–classical mixture and that quantum wave states are more efficient than classical wave states in terms of their randomness properties. Full article
(This article belongs to the Special Issue Quantum Optics: Theory, Methods and Applications)
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8 pages, 1632 KiB  
Communication
Polarization-Sensitive Quantum Optical Coherence Tomography: Birefringence Profiles of Biological Samples
by Vitaly Sukharenko and Roger Dorsinville
Appl. Sci. 2024, 14(3), 1168; https://doi.org/10.3390/app14031168 - 30 Jan 2024
Viewed by 1126
Abstract
Polarization-sensitive quantum optical coherence tomography (PS-QOCT) is used to image and characterize birefringence effects in biological samples. Entangled photons are generated via spontaneous parametric down-conversion and split into a reference arm and a sample arm of a Mach Zehnder interferometer. Interferometric patterns between [...] Read more.
Polarization-sensitive quantum optical coherence tomography (PS-QOCT) is used to image and characterize birefringence effects in biological samples. Entangled photons are generated via spontaneous parametric down-conversion and split into a reference arm and a sample arm of a Mach Zehnder interferometer. Interferometric patterns between two entangled photons reveal information about tissue birefringence. Biological tissue samples are imaged and characterized, and their quantum interference patterns and birefringence profiles are presented. Full article
(This article belongs to the Special Issue Quantum Optics: Theory, Methods and Applications)
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20 pages, 738 KiB  
Article
Bell-State-Exchange-Parity-Based Protocol for Efficient Autocompensation of Quantum Key Distribution Encoded in Polarization or Spatial Modes
by Gabriel M. Carral, Jesús Liñares, Eduardo F. Mateo and Xesús Prieto-Blanco
Appl. Sci. 2023, 13(23), 12907; https://doi.org/10.3390/app132312907 - 1 Dec 2023
Cited by 1 | Viewed by 1188
Abstract
We analyze autocompensation possibilities in entanglement-based QKD protocols. In particular, we study the seminal BBM92 protocol and find that an autocompensating technique is possible, although with severe limitations. This prompts the introduction of a different, more practical protocol based on Bell state exchange [...] Read more.
We analyze autocompensation possibilities in entanglement-based QKD protocols. In particular, we study the seminal BBM92 protocol and find that an autocompensating technique is possible, although with severe limitations. This prompts the introduction of a different, more practical protocol based on Bell state exchange parity (BSEP), which allows for intrinsic autocompensation of optical fiber perturbations in various two-dimensional fiber-optic encodings while retaining advantageous MDI-QKD characteristics. We present the BSEP protocol in detail, describing both the quantum light propagation and the optical hardware requirements. Finally, we analyze its security, computing its expected performance through the key rate. Full article
(This article belongs to the Special Issue Quantum Optics: Theory, Methods and Applications)
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16 pages, 8322 KiB  
Article
Topology and Polarization of Optical Vortex Fields from Atomic Phased Arrays
by Hao Wang and Andrei Afanasev
Appl. Sci. 2023, 13(9), 5672; https://doi.org/10.3390/app13095672 - 4 May 2023
Viewed by 1385
Abstract
We developed a theoretical formalism for the generation of optical vortices by phased arrays of atoms. Using the Jacobi–Anger expansion, we demonstrated the resulting field topology and determined the least number of individual atoms necessary for the generation of vortices with a given [...] Read more.
We developed a theoretical formalism for the generation of optical vortices by phased arrays of atoms. Using the Jacobi–Anger expansion, we demonstrated the resulting field topology and determined the least number of individual atoms necessary for the generation of vortices with a given topological charge. Vector vortices were considered, taking into account both the spin and orbital angular momenta of electromagnetic fields. It was found for the vortex field that, in the far field limit, the spatial variation in spin-density matrix parameters—orientation and alignment—is independent of the distance to the radiation source. Full article
(This article belongs to the Special Issue Quantum Optics: Theory, Methods and Applications)
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8 pages, 396 KiB  
Communication
Light-to-Plasma Momentum Transfer
by G. J. Tallents
Appl. Sci. 2023, 13(9), 5225; https://doi.org/10.3390/app13095225 - 22 Apr 2023
Viewed by 1461
Abstract
The momentum of light in a plasma and the momentum transfer from light to plasma is calculated for a uniform plane of light incident into a uniform plasma. At low irradiance, the Minkowski and Abraham expressions for photon momentum are shown to be [...] Read more.
The momentum of light in a plasma and the momentum transfer from light to plasma is calculated for a uniform plane of light incident into a uniform plasma. At low irradiance, the Minkowski and Abraham expressions for photon momentum are shown to be equivalent. We evaluate relativistic electron motion at a high irradiance for a plasma and show that most light momentum is transferred to the electrons associated with motion parallel to the light propagation at an irradiance corresponding to the reduced vector potential ao≈3.7 (reduced irradiance Iλ2≈2×1019 W cm−2 μm2). Our results show that to ensure the maximum momentum transfer from photons to electrons in motion parallel to the k-direction for fixed laser pulse energy, the laser focusing should be adjusted to achieve ao≈3.7, even if tighter focusing, and thus higher ao values, are possible. Full article
(This article belongs to the Special Issue Quantum Optics: Theory, Methods and Applications)
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