Final rept. 1 Nov 2000-31 May 2004
STATE UNIV OF NEW YORK AT STONY BROOK RESEARCH FOUNDATION
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The focus of this project was the study of the physics of mesoscopic devices, e.g. single electron devices, related to their use in quantum computation. Theoretical work focused on the design of novel qubit and gate structures using Josephson junctions in the regime of charge dynamics, and theory of mesoscopic quantum measurements including quantum-detector properties of solid-state devices, most importantly, SET transistors. The major experimental effort in this project was the study of the effects of measurement on the periodicity of the Coulomb staircase of a superconducting box. Measuring devices incorporating Josephson junctions operated near or above the gap voltage, even briefly after the period of coherence in the qubit, generate quasiparticles in the qubit which can persist for milliseconds and generate decoherence in subsequent measurements A technique was developed to flush these quasiparticles from the qubit by applying a brief gate pulse to the charge box just before the start of each measurement cycle to invert the potential.
- Electrical and Electronic Equipment
- Electricity and Magnetism
- Solid State Physics