Virtual Institutes

Optically Levitating Dielectrics in the Quantum Regime: Theory and Protocols

Mon, 2011-02-14 10:33 - Matteo Rizzi

Date:

2010-10-15

Reference:

O. Romero-Isart, A. C. Pflanzer, M. L. Juan, R. Quidant, N. Kiesel, M. Aspelmeyer,, J. I. Cirac
Phys. Rev. A 83, 013803 (2011)
http://pra.aps.org/abstract/PRA/v83/i1/e013803

We provide a general quantum theory to describe the coupling of light with the motion of a dielectric object inside a high finesse optical cavity. In particular, we derive the total Hamiltonian of the system as well as a master equation describing the state of the center of mass mode of the dielectric and the cavity field mode. In addition, a quantum theory of elasticity is used in order to study the coupling of the center of mass motion with internal vibrational excitations of the dielectric.

Atom chip based generation of entanglement for quantum metrology

Fri, 2010-03-19 12:29 - Daniele Binosi

Date:

2010-03-08

Reference:

Max F. Riedel, Pascal Böhi, Yun Li, Theodor W. Hänsch, Alice Sinatra, Philipp Treutlein
Nature 464, 1170-1173 (22 April 2010) | doi:10.1038/nature08988
arXiv:1003.1651 [quant-ph] (http://arxiv.org/abs/1003.1651)

Atom chips provide a versatile `quantum laboratory on a microchip' for experiments with ultracold atomic gases. They have been used in experiments on diverse topics such as low-dimensional quantum gases, cavity quantum electrodynamics, atom-surface interactions, and chip-based atomic clocks and interferometers. A severe limitation of atom chips, however, is that techniques to control atomic interactions and to generate entanglement have not been experimentally available so far.