About QUINST

Quantum mechanics is at the heart of our technology and economy - the laser and the transistor are quantum devices - but its full potential is far from being realized. Recent technological advances in optics, nanoscience and engineering allow experimentalists to create artificial structures or put microscopic and mesoscopic systems under new manipulable conditions in which quantum phenomena play a fundamental role.

Quantum technologies exploit these effects with practical purposes. The objective of Quantum Science is to discover, study, and control quantum efects at a fundamental level. These are two sides of a virtuous circle: new technologies lead to the discovery and study of new phenomena that will lead to new technologies.

Our group's aim is  to control and understand quantum phenomena in a multidisciplinary intersection of  Quantum Information, Quantum optics and cold atoms, Quantum Control, Spintronics, Quantum metrology, Atom interferometry, Superconducting qubits and Circuit QED and Foundations of Quantum Mechanics.

 

 

Latest events

province:

Prof. A. Sadreev (Institute of Physics, Krasnoyarsk, Russia) (Seminar)

When end where

12/2012

Description

2011/01/28, Prof. A. Sadreev (Institute of Physics, Krasnoyarsk, Russia)

Place:  Sala de Seminarios del Departamento de Física Teórica e Historia de la Ciencia
Time: 11:30h.
Title: Light localization in photonic crystal waveguide coupled to
Kerr defects

Abstract
von Neumann and Wigner in 1929 claimed that Schroedinger equation could possess localized solutions in the form of bound states in continuum (BSC). These solutions   appear for a special class of potentials and correspond to isolated eigenvalues embedded in the continuum of positive energy states. This result was regarded for a long time as a mathematical curiosity till Capasso observed the BSC in superlattices. Examples of the BSC can be more easily found if one goes beyond the one-dimensional Schroedinger equation, for example in open two-dimensional quantum dots and photonic crystal Fabry-Perot resonators. However, there the BSC might exist only in a narrow range of parameters. We show that using nonlinear (Kerr) elements in photonic crystal waveguides opens the venue to achieve robust self-consistent BSC. As a result, light localization around these elements gives rise to new types of resonances. Moreover we show that nonlinearity breaks the system symmetry even if elements are arranged  symmetrically.