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Quantum correlations of two qubits in a system of fiber-coupled cavities Imprimir
Expositor: Vitalie Eremeev
Facultad de Física
Pontificia Universidad Católica de Chile
Santiago, Chile

Viernes 25 de octubre, 16:00hrs

Av Blanco Encalada 2008, 3er piso

Sala de Seminarios


I will discuss a model of engineering of nonclassical (quantum) correlations such as entanglement and discord for two initially uncorrelated qubits (two-level atoms) trapped in the fiber-coupled cavities. The cavities and fiber are coupled to their proper thermal reservoirs. Based on the microscopic approach of the open quantum system [1], the dynamics of the two-qubit system is derived and the quantum correlations are quantified. For the commonly studied simple case of only one excitation in the system, we recently [2,3] have shown that the stable long-lived quantum correlations could be generated in the presence of the dissipation channels to the thermal reservoirs. This curious result is an example that could give us a new insight into the effects of the system-environment exchange versus the quantum correlations. From the analysis of the obtained results we conclude that the entanglement can be optimized by engineering the thermal bath of the fiber rather than the baths of each cavity, hence suggesting that the "quasi-local" manipulations produce little effect on the generation of entanglement. Summarizing, the model discussed here can be implemented as a quantum nondemolition (QND) measurement on the cavity-fiber fields with a high success probability. Our study can be of interest as an alternative method for protection and generation of quantum correlations. Some recent advances in the developing of the model will be discussed.
 
[1] V. Montenegro and M. Orszag, J. Phys. B: At. Mol. Opt. Phys. 44 154019 (2011).
[2] V. Montenegro, V. Eremeev and M. Orszag, Phys. Scr. T147, 014022 (2012).
[3] V. Eremeev, V. Montenegro and M. Orszag, Phys. Rev. A 85, 032315 (2012). 
 

Seminarios Anteriores

ACT: latest results and prospects for the new polarization-sensitive camera ACTpol Imprimir

Expositor: Rolando Dünner

Departamento de Astronomía

Pontificia Universidad Católica de Chile

 

The Atacama Cosmology Telescope: latest results and prospects for the new polarization-sensitive camera ACTpol

 

Viernes 18 de octubre, 16 h

Av Blanco Encalada 2008, 3er piso

Sala de Seminarios

 

The study of the Cosmic Microwave Background (CMB) has revolutionized our understanding of nature, helping to address fundamental questions about the age and composition of the Universe, the nature of dark matter and dark energy, and having the potential to probe the physics of inflation at energies unreachable otherwise.  The Atacama Cosmology Telescope (ACT) has measured the CMB with arcminute scale resolution over a wide area of the sky, leading to several exciting discoveries including the first detections of the kinematic Sunyaev-Zel'dovich effect and the CMB gravitational lensing power spectrum. I will refer to these results in the context of current experimental datasets, as well prospects for the upcoming polarization-sensitive observations being done today by ACTpol.

 
Front propagation in inhomogeneous systems Imprimir
Expositor: Vincent Odent
Departamento de Física - DFI
FCFM, Universidad de Chile

Viernes 11 de octubre, 16 h
Av Blanco Encalada 2008, 3er piso
Sala de Seminarios 

In a bistable system, the front dynamics connecting two states is a problem concerning many domains of physics. In this system, under a breaking symmetry parameter, the front propagates, except at the Maxwell point. A spatial periodic forcing has been proposed to lock the drift of the proposed front. In optics, where spatial pumping is usually Gaussian, one can wonder how the dynamics of fronts will turn.
 
In this lecture I will show two experimental systems which present front pinning induced by a Gaussian optical forcing, a Kerr Pérot-Fabry cavity submitted to a negative diffraction and a photo-isomerization process. I will propose a phenomenological bistable model to describe the front dynamics and their final positions which they are directly linked to the Gaussian beam properties.

 
Conductividad via holografía en el dual gravitacional de ABJM masivo y el paradigma de... Imprimir

Expositor: Francisco Rojas

Instituto de Física Teórica

ICTP-SAIFR, Sao Paulo, Brasil

 

Conductividad via Holografía en el Dual Gravitacional de ABJM Masivo y el Paradigma de la Membrana en Agujeros Negros  

 

Viernes 4 de octubre, 16 h

Av Blanco Encalada 2008, 3er piso

Sala de Seminarios


En los años recientes ha habido un interés creciente en aplicar dualidades del tipo gauge/gravedad (holografía) para describir fenómenos en materia condensada y calcular sus observables tales como la conductividad. Tal como la dualidad entre supercuerdas IIB y N=4 super Yang-Mills se ha convertido en un ejemplo canónico para estudiar QCD cuando el acoplamiento es fuerte, la recientemente descubierta dualidad entre supercuerdas IIA y el modelo ABJM rápidamente está ganando popularidad en el estudio del régimen de acoplamiento fuerte en sistemas de materia condensada en 2+1 dimensiones. En esta charla resumiré brevemente estos descubrimientos y mostraré un nuevo cálculo para la conductividad en este tipo de dualidades y su similitud con el paradigma de la membrana en agujeros negros. 
 
Estabilidad de un Sistema de N Polarones Imprimir

Expositor: Rafael Benguria

Departamento de Física

Pontificia Universidad Católica de Chile

 

Viernes 27 de septiembre, 16 h

Av Blanco Encalada 2008, 3er piso

Sala de Seminarios

 

En esta charla conisderaré un sistema de polarones, y discutiré el comportamiento de su energía en términos del número de partículas. Revisaré varios resultados recientes, y presentaré nuevos resultados obtenidos en colaboración con Gonzalo Bley (PUC), Rupert Frank (Caltrech) y Elliott Lieb (Princeton). 

 
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