An All-Optical Quantum Gate in a Semiconductor Quantum Dot
Abstract
We report coherent optical control of a biexciton (two electron-hole pairs), confined in a single quantum dot, that shows coherent oscillations similar to the excited-state Rabi flopping in an isolated atom. The pulse control of the biexciton dynamics, combined with previouslydemonstrated control of the single-exciton Rabi rotation, serves as the physical basis for a two-bit conditional quantum logic gate. The truth table of the gate shows the features of an all-optical quantum gate with interacting yet distinguishable excitons as qubits. Evaluation of the fidelity yields a value of 0.7 for the gate operation. Such experimental capabilityis essential to a scheme for scalable quantum computation bymeans of the optical control of spin qubits in dots.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 08, 2003
- Source ID
- 10.1126/science.1083800
Entities
People
- C. Piermarocchi
- D. Gammon
- D. Scott Katzer
- Doewon Park
- Duncan G. Steel
- Lu Jeu Sham
- T. H. Stievater
- Xiaoqin Li
- Yanwen Wu
Organizations
- Michigan State University
- United States Naval Research Laboratory
- University of California, San Diego
- University of Michigan