Dresden 2011 – wissenschaftliches Programm

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SYQE: Intersectional Symposium Cavity meets Circuit Quantum Electrodynamics

SYQE 1: Cavity meets Circuit Quantum Electrodynamics

SYQE 1.2: Hauptvortrag

Freitag, 18. März 2011, 11:00–11:30, HSZ 01

Light shifts of ground-state quantum beats in Cavity QED, a consequence of quantum jumps. — •Luis Orozco — Joint Quantum Institute, Department of Physics and National Institute of Standards and Technology, University of Maryland, College Park, MD 20742

We present a study of ground-state light shifts with weak coherent excitation when the light is quasi-resonant with an electronic excited state of Rb (within a linewidth). This mechanism is only discernible through the polarization mode selection (drive V, measure H) available in cavity QED and the ground-state quantum beats, seen through correlation measurements on the H mode. The shift requires the presence of spontaneous emission, which generally preserves the ground-state coherence but induces a significant frequency shift with the presence of even a single photon.

Quantum trajectories show that quantum jumps on the driven V mode that happen in-between H detections cause phase shifts on the Larmor precesion. Quantum jumps interrupt the atomic dipole and transfer the differential phase accumulated by the excited state to the ground state. The stochastic process of the quantum jumps produces both a frequency shift, if the phase jumps are frequent but small compared to π, and a broadening from the phase diffusion process.

Work performed with Adres D. Cimmarusti, David G. Morris, Pablo Barberis-Blostein and H. J Carmichael with support from NSF, USA; CONACYT, Mexico; and The Marsden Fund of the Royal Society of New Zealand.