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2.6
2.1
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Photonics
Special Issues
Quantum Photonics Circuits
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Quantum Photonics Circuits

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

Deadline for manuscript submissions: closed (1 February 2017) | Viewed by 20062

Special Issue Editors

Prof. Dr. Roberto Morandotti

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Guest Editor
Ultrafast Optical Processing Group, INRS-EMT Université du Québec, 1650 Blvd. Lionel Boulet, Varennes, QC J3X 1S2, Canada
Dr. Laurent Labonté

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Guest Editor
Université de Nice Sophia Antipolis, Laboratoire de Physique de la Matière Condensée, CNRS UMR7336, France
Dr. Marco Liscidini

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Guest Editor
Department of Physics (office # 2-60), University of Pavia, Via Bassi 6 Pavia, Italy

Special Issue Information

Dear Colleagues,

Quantum information science (QIS) has established new benchmarks in communication security, metrology, and computation by exploiting concepts typical of quantum mechanics, such as entanglement and superposition. For instance, quantum approaches to optical communication guarantee augmented security in data exchange, and quantum computing promises processing capabilities well beyond the limits of classical mainframes. Photonics is seen to play a major role in the generation, routing, and manipulation of quantum information, and photons are front-line players in the development and application of QIS. In this perspective, integrated optical circuits, which are characterized by high density of optical elements and configurability, appear to be indispensable to ensure scalability and reliability of quantum optical devices. The ultimate dream in the field of quantum photonic circuits is the complete on-chip integration of quantum systems, from the generation of nonclassical states to their manipulation and detection. This Special Issue is expected to address different strategies towards both the choice of the technology platform (single material or hybrid geometry) and the development and integration of all the required optical elements.

Prof. Dr. Roberto Morandotti
Dr. Laurent Labonté
Dr. Marco Liscidini
Guest Editors

Manuscript Submission Information

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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

  • Integrated waveguides
  • Optical resonators
  • Classical and quantum nonlinear optics
  • Tunable, reconfigurable and scalable on-chip components
  • Quantum interference
  • Quantum information/computing/control
  • Technological platform
  • Fabrication process
  • Nanophotonics
  • Photonic crystals
  • Hybrid photonic circuits

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Published Papers (3 papers)

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Research

2293 KiB  
Article
Generation and Detection of Continuous Variable Quantum Vortex States via Compact Photonic Devices
by David Barral, Daniel Balado and Jesús Liñares
Photonics 2017, 4(1), 2; https://doi.org/10.3390/photonics4010002 - 3 Jan 2017
Cited by 5 | Viewed by 5250
Abstract
A quantum photonic circuit with the ability to produce continuous variable quantum vortex states is proposed. This device produces two single-mode squeezed states which go through a Mach-Zehnder interferometer where photons are subtracted by means of weakly coupled directional couplers towards ancillary waveguides. [...] Read more.
A quantum photonic circuit with the ability to produce continuous variable quantum vortex states is proposed. This device produces two single-mode squeezed states which go through a Mach-Zehnder interferometer where photons are subtracted by means of weakly coupled directional couplers towards ancillary waveguides. The detection of a number of photons in these modes heralds the production of a quantum vortex. Likewise, a measurement system of the order and handedness of quantum vortices is introduced and the performance of both devices is analyzed in a realistic scenario by means of the Wigner function. These devices open the possibility of using the quantum vortices as carriers of quantum information. Full article
(This article belongs to the Special Issue Quantum Photonics Circuits)
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2826 KiB  
Article
Implementation of Traveling Odd Schrödinger Cat States in Circuit-QED
by Jaewoo Joo, Su-Yong Lee and Jaewan Kim
Photonics 2016, 3(4), 57; https://doi.org/10.3390/photonics3040057 - 31 Oct 2016
Cited by 5 | Viewed by 5384
Abstract
We propose a realistic scheme of generating a traveling odd Schrödinger cat state and a generalized entangled coherent state in circuit quantum electrodynamics (circuit-QED). A squeezed vacuum state is used as the initial resource of nonclassical states, which can be created through a [...] Read more.
We propose a realistic scheme of generating a traveling odd Schrödinger cat state and a generalized entangled coherent state in circuit quantum electrodynamics (circuit-QED). A squeezed vacuum state is used as the initial resource of nonclassical states, which can be created through a Josephson traveling-wave parametric amplifier, and travels through a transmission line. Because a single-photon subtraction from the squeezed vacuum gives an odd Schrödinger cat state with very high fidelity, we consider a specific circuit-QED setup consisting of the Josephson amplifier creating the traveling resource in a line, a beam-splitter coupling two transmission lines, and a single photon detector located at the end of the other line. When a single microwave photon is detected by measuring the excited state of a superconducting qubit in the detector, a heralded cat state is generated with high fidelity in the opposite line. For example, we show that the high fidelity of the outcome with the ideal cat state can be achieved with appropriate squeezing parameters theoretically. As its extended setup, we suggest that generalized entangled coherent states can be also built probabilistically and that they are useful for microwave quantum information processing for error-correctable qudits in circuit-QED. Full article
(This article belongs to the Special Issue Quantum Photonics Circuits)
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3923 KiB  
Article
Integration of Single-Photon Sources and Detectors on GaAs
by Giulia Enrica Digeronimo, Maurangelo Petruzzella, Simone Birindelli, Rosalinda Gaudio, Sartoon Fattah Poor, Frank W.M. Van Otten and Andrea Fiore
Photonics 2016, 3(4), 55; https://doi.org/10.3390/photonics3040055 - 21 Oct 2016
Cited by 18 | Viewed by 8588
Abstract
Quantum photonic integrated circuits (QPICs) on a GaAs platform allow the generation, manipulation, routing, and detection of non-classical states of light, which could pave the way for quantum information processing based on photons. In this article, the prototype of a multi-functional QPIC is [...] Read more.
Quantum photonic integrated circuits (QPICs) on a GaAs platform allow the generation, manipulation, routing, and detection of non-classical states of light, which could pave the way for quantum information processing based on photons. In this article, the prototype of a multi-functional QPIC is presented together with our recent achievements in terms of nanofabrication and integration of each component of the circuit. Photons are generated by excited InAs quantum dots (QDs) and routed through ridge waveguides towards photonic crystal cavities acting as filters. The filters with a transmission of 20% and free spectral range ≥66 nm are able to select a single excitonic line out of the complex emission spectra of the QDs. The QD luminescence can be measured by on-chip superconducting single photon detectors made of niobium nitride (NbN) nanowires patterned on top of a suspended nanobeam, reaching a device quantum efficiency up to 28%. Moreover, two electrically independent detectors are integrated on top of the same nanobeam, resulting in a very compact autocorrelator for on-chip g(2)(τ) measurements. Full article
(This article belongs to the Special Issue Quantum Photonics Circuits)
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