Xesús Prieto-Blanco

High-dimensional autocompensating discrete modulation CV-QKD protocol in optical fibers

Alexandre Vázquez-Martínez, Xesús Prieto-Blanco, Eduardo F. Mateo, Jesús Liñares

In this work we present a high-dimensional discrete modulated CV-QKD protocol, with dimension , in optical fibers, where is the number of optical modes. We use -dimensional product states of weak coherent states that undergo perturbations along optical fibers and that are …

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High-Dimensional Quantum Key Distribution with N-Qudits States in Optical Fibers

Jesús Liñares, Xesús Prieto-Blanco, Alexandre Vázquez-Martínez

We present a high-dimensional quantum key distribution protocol by using N-qudits quantum light states—that is, product states with N photons, each of them in a quantum superposition of dimension d, which provides a high dimension dN and, accordingly, a very high security …

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Multichannel hybrid quantum cryptography for submarine optical communications

Jesús Liñares, Xesús Prieto-Blanco, Alexandre Vázquez-Martínez, Eduardo F. Mateo

We present a multichannel hybrid quantum cryptography approach intended for submarine quantum optical communications between Alice and Bob separated by a distance beyond the current QKD possibilities, each located on a coastline. It is based on the difficulty of simultaneous access to …

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High-Dimensional Quantum Key Distribution with N-Qudits States in Optical Fibers

Jesús Liñares, Xesús Prieto-Blanco, Alexandre Vázquez-Martínez

We present a high-dimensional quantum key distribution protocol by using N-qudits quantum light states, that is, product states with N photons, each of them in a quantum superposition of dimension d which provides a high dimension dN and accordingly a very high …

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Quantum Optics: Theory, Methods, and Applications

Jesús Liñares, Xesús Prieto-Blanco

It can be stated without a doubt that Quantum Optics is currently one of the liveliest fields in both fundamental physics and applied physics [...]

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Photonic quantum circuits with only synchronous directional couplers in ion-exchanged glass

Jesús Liñares, Carlos Montero-Orille, Xesús Prieto-Blanco, Javier Varela-Carballo et autres

Abstract We show that photonic quantum circuits for implementing arbitrary SU(N) transformations can be made using only synchronous directional couplers. These simple elements provide both beam splitting and phase shifting so that, under a proper concatenation of such elements, unitary transformations of …

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Chromatic characterization of directional couplers fabricated by Na+/K+ ion-exchange in glass for the short wavelength band 700–900 nm

Javier Varela-Carballo, Xesús Prieto-Blanco, Carlos Montero-Orille, Jesús Liñares

A chromatic characterization is presented for directional couplers fabricated by Na + /K + ion-exchange in glass to work in the short wavelength band 700–900 nm. This band is particularly important for free-space optical communications because presents a good atmospheric transmission and …

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Chromatic Characterization of Directional Couplers Fabricated by Na+/K+ Ion-Exchange in Glass for the Short Wavelength Band 700-900nm

Jesús Liñares, Xesús Prieto-Blanco, Carlos Montero-Orille, Javier Varela-Carballo

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Bell-State-Exchange-Parity-Based Protocol for Efficient Autocompensation of Quantum Key Distribution Encoded in Polarization or Spatial Modes

Gabriel M. Carral, Jesús Liñares, Eduardo F. Mateo, Xesús Prieto-Blanco

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 …

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Quantum Projectors Implemented With Optical Directional Couplers in Ion-Exchanged Glasses

Xesús Prieto-Blanco, Carlos Montero-Orille, Jesús Liñares, Héctor González-Núñez et autres

Ion-exchanged glass as a platform for quantum photonics is proposed. Quantum projectors are implemented with integrated optical directional couplers fabricated by ion-exchange K$^+$/Na$^+$in soda-lime glass. We consider devices composed of concatenated directional couplers which implement$N$-dimensional quantum projective measurements, and concomitantly the production …

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Autocompensating measurement-device-independent quantum cryptography in space division multiplexing optical fibers

Jesús Liñares, Gabriel M. Carral, Xesús Prieto-Blanco, Daniel Balado

Abstract Single photon or biphoton states propagating in optical fibers or in free space are affected by random perturbations and imperfections that disturb the information encoded in such states and accordingly quantum key distribution is prevented. We propose three different systems for …

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Theoretical Modelling of Ion Exchange Processes in Glass: Advances and Challenges

Xesús Prieto-Blanco, Carlos Montero-Orille

In the last few years, some advances have been made in the theoretical modelling of ion exchange processes in glass. On the one hand, the equations that describe the evolution of the cation concentration were rewritten in a more rigorous manner. This …

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