Initial State Preparation and Stability in Narrow Band-Gap Semiconductor Qubits

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The output of a quantum computing system depends on the quality of the preparation of the initial state of the qubit or qubits to be used in the subsequent computations. Here, we have defined a qubit structure using a coupled waveguide system. To prepare the initial state of the qubit we set the coupling distance between the two waveguides to a point which corresponds to the desired electron density transfer between the input portion of the qubit and the output portion of the qubit [1]. To this end, it is advantageous to use narrow band-gap semiconductor materials for quantum computing applications due to their relatively long phase coherent times and high mobilites. However, while favorable parameters are attainable in narrow band-gap semiconductors, it is a valid to question the stability of the initial state under varying experimentally verified phase coherent times, inelastic scattering, and imprecise definition of the coupling region in InAs, GaAs, and InSb.

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Journal: TechConnect Briefs
Volume: 2, Technical Proceedings of the 2003 Nanotechnology Conference and Trade Show, Volume 2
Published: February 23, 2003
Pages: 198 - 201
Industry sectors: Advanced Materials & Manufacturing | Sensors, MEMS, Electronics
Topic: Modeling & Simulation of Microsystems
ISBN: 0-9728422-1-7