Biexciton Quantum Coherence in a Single Quantum Dot

Gang Chen; T. H. Stievater; E. T. Batteh; Xiaoqin Li; D. G. Steel; D. Gammon; D. S. Katzer; D. Park; L. J. Sham

doi:10.1103/PhysRevLett.88.117901

Biexciton Quantum Coherence in a Single Quantum Dot

Gang Chen, T. H. Stievater, E. T. Batteh, Xiaoqin Li, D. G. Steel, D. Gammon, D. S. Katzer, D. Park, and L. J. Sham

Phys. Rev. Lett. 88, 117901 – Published 5 March 2002

Abstract

Nondegenerate (two-wavelength) two-photon absorption using coherent optical fields is used to show that there are two different quantum mechanical pathways leading to formation of the biexciton in a single quantum dot. Of specific importance to quantum information applications is the resulting coherent dynamics between the ground state and the biexciton from the pathway involving only optically induced exciton/biexciton quantum coherence. The data provide a direct measure of the biexciton decoherence rate which is equivalent to the decoherence of the Bell state in this system, as well as other critical optical parameters.

Received 28 August 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.117901

Authors & Affiliations

Gang Chen^1,*, T. H. Stievater^1,†, E. T. Batteh¹, Xiaoqin Li¹, D. G. Steel¹, D. Gammon², D. S. Katzer², D. Park², and L. J. Sham³

¹The FOCUS Center, Harrison M. Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109
²The Naval Research Laboratory, Washington, DC 20375
³Department of Physics, University of California San Diego, La Jolla, California 92093

^*Present address: Bell Labs, Lucent Technologies, Murray Hill, NJ 07974.
^†Present address: Naval Research Laboratory, Washington, DC 20375.