Generation and Detection of Continuous Variable Quantum Vortex States via Compact Photonic Devices

Barral, David; Balado, Daniel; Liñares, Jesús

doi:10.3390/photonics4010002

Volume 4, Issue 1

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Generation and Detection of Continuous Variable Quantum Vortex States via Compact Photonic Devices

David Barral^*

, Daniel Balado and Jesús Liñares

Optics Area, Department of Applied Physics, Faculty of Physics and Faculty of Optics and Optometry, University of Santiago de Compostela, Campus Vida s/n (Campus Universitario Sur), Santiago de Compostela, Galicia E-15782, Spain

Author to whom correspondence should be addressed.

Photonics 2017, 4(1), 2; https://doi.org/10.3390/photonics4010002

Received: 10 October 2016 / Revised: 20 December 2016 / Accepted: 29 December 2016 / Published: 3 January 2017

(This article belongs to the Special Issue Quantum Photonics Circuits)

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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. 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. View Full-Text

Keywords: quantum information processing; continuous variables; integrated optics

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Barral, D.; Balado, D.; Liñares, J. Generation and Detection of Continuous Variable Quantum Vortex States via Compact Photonic Devices. Photonics 2017, 4, 2.