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119 results on '"Moya-Cessa, Hector"'

112. Connecting nth order generalised quantum Rabi models: emergence of nonlinear spin-boson coupling via spin rotations

Author

Casanova, Jorge, Puebla, Ricardo, Moya-Cessa, Hector, and Plenio, Martin B.

Subjects
Condensed Matter::Quantum Gases, DDC 530 / Physics, Nonlinear systems, Single photons and quantum effects, Quantenmechanik, Quantum mechanics, 3. Good health, Quantum Systems
Abstract

We establish an approximate equivalence between a generalised quantum Rabi model and its nth order counterparts, where spinboson interactions are nonlinear as they comprise a simultaneous exchange of n bosonic excitations. Although there exists no unitary transformation between these models, we demonstrate their equivalence to a good approximation in a wide range of parameters. This shows that nonlinear spin-boson couplings, i.e., nth order quantum Rabi models, are accessible to quantum systems with only linear coupling between boson and spin modes by simply adding spin rotations and after an appropriate transformation. Furthermore, our result prompts novel approximate analytical solutions to the dynamics of the quantum Rabi model in the ultrastrong coupling regime improving previous approaches., publishedVersion

114. Quantum state transformations by multiport array beam splitters.

Author

Perez-Leija, Armando, Keil, Robert, Moya-Cessa, Hector, Szameit, Alexander, and Christodoulides, Demetrios N.

Abstract

We introduce a multiport waveguide array beam-splitter that emulates the action of the angular momentum matrix Jx. Quantum transformations carried out by such devices are discussed and pertinent examples are provided. [ABSTRACT FROM PUBLISHER]

Published
2012

115. Observation of Bloch-like oscillations in Glauber-Fock oscillator lattices.

Author

Keil, Robert, Perez-Leija, Armando, Moya-Cessa, Hector, Szameit, Alexander, and Christodoulides, Demetrios N.

Abstract

We report the first observation of classical Bloch-like oscillations and revivals of light in a new class of dynamic optical systems-the so-called Glauber-Fock oscillator lattices. [ABSTRACT FROM PUBLISHER]

Published
2012

117. Perfect transfer of path-entangled photons in Jx photonic lattices.

Author

Perez-Leija, Armando, Keil, Robert, Moya-Cessa, Hector, Szameit, Alexander, and Christodoulides, Demetrios N.

Subjects
*PHOTONS, *CLOUD computing, *LATTICE theory, *PHYSICS, *THERMODYNAMICS
Abstract

We demonstrate that perfect transfer of path-entangled photons as well as of single-photon states is possible in a certain class of spin inspired optical systems—the so-called Jx photonic lattices. In these fully integrable optical arrangements, perfect cyclic transitions from correlated states to totally anticorrelated states can naturally occur. Moreover we show that the bunching and antibunching response of path-entangled photons can be preengineered at will in such coupled optical arrangements. We elucidate these effects via pertinent examples. [ABSTRACT FROM AUTHOR]

Published
2013
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118. Generating photon-encoded W states in multiport waveguide-array systems.

Author

Perez-Leija, Armando, Hernandez-Herrejon, J. C., Moya-Cessa, Hector, Szameit, Alexander, and Christodoulides, Demetrios N.

Subjects
*OPTICAL waveguides, *PHOTONS, *OPTICAL lattices, *COHERENCE (Optics), *AMPLITUDE modulation, *PROBABILITY theory, *COEFFICIENTS (Statistics)
Abstract

We propose a versatile approach for generating multipartite W states in predesigned on-chip multiport photonic lattices. It is shown that is possible to produce photon-encoded W states where exactly one photon is coherently "shared" among N optical modes by judiciously adjusting the coupling coefficients involved in one-dimensional arrays of evanescently coupled single-mode waveguides. Two-dimensional waveguide configurations are also investigated as possible avenues to produce W states with equal probability amplitudes and equal relative phases. [ABSTRACT FROM AUTHOR]

Published
2013
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