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- Title
An all-optical quantum gate in a semiconductor quantum dot.
- Authors
Li, Xiaoqin; Wu, Yanwen; Steel, Duncan; Gammon, D; Stievater, T H; Katzer, D S; Park, D; Piermarocchi, C; Sham, L J
- 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 previously demonstrated 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 capability is essential to a scheme for scalable quantum computation by means of the optical control of spin qubits in dots.
- Publication
Science (New York, N.Y.), 2003, Vol 301, Issue 5634, p809
- ISSN
1095-9203
- Publication type
Journal Article
- DOI
10.1126/science.1083800