An All-Optical Quantum Gate in a Semiconductor Quantum Dot
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- 8 August 2003
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 301 (5634) , 809-811
- https://doi.org/10.1126/science.1083800
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.Keywords
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