Journal Article10.1126/SCIENCE.1083800
An All-Optical Quantum Gate in a Semiconductor Quantum Dot
Xiaoqin Li,Yanwen Wu,Duncan G. Steel,Daniel Gammon,Todd H. Stievater,D. S. Katzer,Doewon Park,Carlo Piermarocchi,L. J. Sham +8 more
TL;DR: C 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 is reported.
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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 07 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
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