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

M.J. Gilbert, R. Akis, D.K. Ferry
Arizona State University, US

Keywords: Quantum Computing, Qubits, Stability, Narrow Band-Gap Semiconductors

Abstract:
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.

NSTI Nanotech 2003 Conference Technical Program Abstract