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Condensed Matter Seminars

ics Condensed Matter
Thursday, April 26, 2007
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Sophia Economou [Host: Eddy Barnes/Paul Fendley]
Naval Research Lab
"Coherence and optical spin rotations in quantum dots"
 Slideshow (PDF)
Optically controlled quantum dots, sometimes referred to as artificial atoms, have been the subject of intense research in recent years. This is due both to their potential role as qubits for quantum computing, and to novel emerging physics, as a result of the interplay of confinement and the semiconductor environment. In the first part of the talk I will present such an effect, Spontaneously Generated Coherence (SGC), in which spontaneous emission of an excited level results in a coherent superposition of two lower levels. This phenomenon, predicted in the context of atomic physics, is so far unobserved in atoms. I will sketch our theory of SGC in quantum dots and present the experimental results of the first observation of this effect. In the second part of my talk the focus will be on the design of arbitrary optical spin rotations, which are necessary operations for quantum computing. Simulations show that our approach yields high quality gates, up to two orders of magnitude faster that existing proposals.

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