Experimental approach to ultrafast optical spin echo of a single quantum dot electron spin
Kristiaan De Greve, David Press, Thaddeus D. Ladd +7 more
The phase coherence of a physical qubit is essential for quantum information processing, motivating fast control methods to preserve that phase. Ultrafast optical techniques allow complete spin control to be performed on a much faster timescale than microwave or electrical control (ps vs. ns at best). Using our ultrafast control techniques, we demonstrate our experimental approach towards a spin echo sequence on the spin of a single electron confined in a semiconductor quantum dot (QD), increasing the observed decoherence time of a single QD electron spin from nanoseconds to several microseconds. The ratio of the observed decoherence time to the demonstrated single-qubit gate time exceeds 105, suggesting strong promise for future quantum information processors.
Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 28, 2009•0 citations