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

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;
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)
PDF [2293 KB, uploaded 3 January 2017]


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 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.

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