Quantum-dot spin-state preparation with near-unity fidelity

Atatüre, M., Dreiser, J., Badolato, A. , Högele, A., Karrai, K. and Imamoglu, A. (2006) Quantum-dot spin-state preparation with near-unity fidelity. Science, 312(5773), pp. 551-553. (doi: 10.1126/science.1126074) (PMID:16601152)

Abstract

We have demonstrated laser cooling of a single electron spin trapped in a semiconductor quantum dot. Optical coupling of electronic spin states was achieved using resonant excitation of the charged quantum dot (trion) transitions along with the heavy-light hole mixing, which leads to weak yet finite rates for spin-flip Raman scattering. With this mechanism, the electron spin can be cooled from 4.2 to 0.020 kelvin, as confirmed by the strength of the induced Pauli blockade of the trion absorption. Within the framework of quantum information processing, this corresponds to a spin-state preparation with a fidelity exceeding 99.8%.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Badolato, Professor Antonio
• Authors: Atatüre, M., Dreiser, J., Badolato, A., Högele, A., Karrai, K., and Imamoglu, A.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Science
• Publisher: American Association for the Advancement of Science
• ISSN: 0036-8075
• ISSN (Online): 1095-9203