15 February 2010 Experimental approach to ultrafast optical spin echo of a single quantum dot electron spin
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Abstract
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.
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Kristiaan De Greve, Kristiaan De Greve, David Press, David Press, Thaddeus D. Ladd, Thaddeus D. Ladd, Benedikt Friess, Benedikt Friess, Peter l. McMahon, Peter l. McMahon, Christian Schneider, Christian Schneider, Martin Kamp, Martin Kamp, Sven Hoefling, Sven Hoefling, Alfred Forchel, Alfred Forchel, Yoshihisa Yamamoto, Yoshihisa Yamamoto, } "Experimental approach to ultrafast optical spin echo of a single quantum dot electron spin", Proc. SPIE 7611, Advances in Photonics of Quantum Computing, Memory, and Communication III, 76110K (15 February 2010); doi: 10.1117/12.843667; https://doi.org/10.1117/12.843667
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