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.
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Supported in part by the Office of Naval Research, the National Security Agency, and Advanced Research and Development Activity under the Army Research Office (contract nos. DAAG55-98-1-0373 and DAAD19-01-1-0478); the Air Force Office of Scientific Research (grant no. F49620-99-1-0045); the National Science Foundation (grant no. DMR 0099572 and FOCUS); and the Defense Advanced Research Projects Agency/Spins. D.G.S. thanks the Guggenheim Foundation for their support.
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Published In
Science
Volume 301 | Issue 5634
8 August 2003
8 August 2003
Copyright
American Association for the Advancement of Science.
Submission history
Received: 24 February 2003
Accepted: 25 June 2003
Published in print: 8 August 2003
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