Hai Doo Cheong

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We investigate coherent time evolution of charge states (pseudospin qubit) in a semiconductor double quantum dot. This fully tunable qubit is manipulated with a high-speed voltage pulse that controls the energy and decoherence of the system. Coherent oscillations of the qubit are observed for several combinations of many-body ground and excited states of(More)
Two dimensional InGaAs/InP PIN photodiode array on semi-insulating InP has been developed for the image sensing of the eye safe laser radar in the 1.55 /spl mu/m wavelength range of the spectrum with high bandwidth and large area. The fabrication and dark current characteristics are discussed. Dark current characteristic is limited by the diffusion and(More)
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