Dr. Veronica Fernandez Profile

Dr. Veronica Fernandez

at Consejo Superior de Investigaciones Científicas

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Publications (6)

Proceedings Article | 19 July 2023 Presentation + Paper

Inflight demonstrator of quantum key distribution between CubeSats of Q-ANSER program

A. Jimenez-Girela, P. Arteaga-Díaz, D. Merino-Pérez, P. Garcia-Parejo, S. Rodríguez-Bustabad, T. Belenguer-Dávila, V. Fernández-Mármol, A. Álvarez-Herrero

Proceedings Volume 12633, 126330C (2023) https://doi.org/10.1117/12.2672097

KEYWORDS: Polarization, Quantum key distribution, Quantum systems, Satellites, Photons, Quantum security, Quantum receivers, Quantum communication protocols, Signal attenuation, Quantum emitters

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SPIE Journal Paper | 22 August 2014

Correction of beam wander for a free-space quantum key distribution system operating in urban environment

Alberto Carrasco-Casado, Natalia Denisenko, Veronica Fernandez

OE, Vol. 53, Issue 08, 084112, (August 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.8.084112

KEYWORDS: Receivers, Quantum key distribution, Sensors, Turbulence, Atmospheric turbulence, Optical fibers, Optical tracking, Mirrors, Transmitters, Optical engineering

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Proceedings Article | 19 September 2009 Paper

Scanning of low-signature targets using time-correlated single-photon counting

Nils Krichel, Aongus McCarthy, Robert Collins, Verónica Fernández, Andrew Wallace, Gerald Buller

Proceedings Volume 7482, 748202 (2009) https://doi.org/10.1117/12.829362

KEYWORDS: Photons, Mirrors, Data acquisition, Signal to noise ratio, Imaging systems, Semiconductor lasers, Signal attenuation, Target acquisition, Transceivers, Cameras

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This paper presents recent progress in the development of a scanning time-of-flight imaging system employing time-correlated single-photon counting (TCSPC) designed for the acquisition of depth information at kilometre ranges. The device is capable of acquiring information on non-cooperative target surfaces at eye-safe average optical power levels in the near-IR regime (<1 mW at 842 nm illumination wavelength). Target illumination is periodic or non-periodic at typical repetition frequencies in the MHz domain, utilising a sub-ns pulse-width laser diode. The system output is steered over the optical field of interest, and return photons from the target are routed towards a single-photon detector. Measurements are performed with a silicon single-photon avalanche diode (SPAD). Effective optical spatial and spectral filtering techniques permit operation in bright daylight conditions. Results in the form of depth images from a variety of targets, taken under various environmental conditions, are presented. Achieved improvements of this first-generation system are discussed in terms of parametric enhancement of quantities such as spatial and spectral filtering, internal optical attenuation and beam size. We detail progress in the design process both based on theoretical assumptions and actual measurements at distances between few 100's of metres and several km. The trade-offs between acquisition time, maximum range and excitation laser power levels are discussed and projections made for this and future depth imaging systems. State-of-the-art TCSPC hardware solutions facilitate the rapid transfer and storage of large quantities of raw data. This renders possible real-time analysis with speed-optimised algorithms such as fast Fourier transform-supported cross-correlation methods, as well as gathering additional information about the scene in post-processing steps, based on approaches such as reversible-jump Markov-chain Monte Carlo (RJMCMC). This algorithm dynamically adapts the number of degrees of freedom of a range measurement, resulting in multi-surface resolution and the possible identification of targets obscured by objects such as foliage.

Proceedings Article | 1 February 2008 Paper

Time-of-flight sensing using time-correlated single-photon counting

Gerald Buller, Aongus McCarthy, Robert Collins, Philip Hiskett, Veronica Fernandez, Sergio Hernandez-Marin, Andrew Wallace

Proceedings Volume 6900, 69001C (2008) https://doi.org/10.1117/12.768401

KEYWORDS: Sensors, Detection and tracking algorithms, Semiconductor lasers, Signal processing, Single photon detectors, 3D acquisition, Mirrors, Pulsed laser operation, Photon counting, Data processing

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Proceedings Article | 10 September 2007 Paper

Gigahertz-clocked quantum key distribution in passive optical networks

Veronica Fernandez, Robert Collins, Karen Gordon, Paul Townsend, Gerald Buller

Proceedings Volume 6780, 678004 (2007) https://doi.org/10.1117/12.732476

KEYWORDS: Quantum key distribution, Receivers, Clocks, Photons, Networks, Network architectures, Standards development, Telecommunications, Passive optical networks, Transmitters

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Proceedings Article | 7 July 2005 Paper

Quantum key distribution in a multi-user network at gigahertz clock rates

Veronica Fernandez, Karen Gordon, Robert Collins, Paul Townsend, Sergio Cova, Ivan Rech, Gerald Buller

Proceedings Volume 5840, (2005) https://doi.org/10.1117/12.608650

KEYWORDS: Quantum key distribution, Clocks, Photons, Standards development, Vertical cavity surface emitting lasers, Polarization, Sensors, Telecommunications, Optical fibers, Single photon detectors

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Showing 5 of 6 publications

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