Exponentially Localized Magnetic Fields for Single-Spin Quantum Logic Gates

Details Exponentially Localized Magnetic Fields for Single-Spin Quantum Logic Gates Exponentially Localized Magnetic Fields for Single-Spin Quantum Logic Gates

2003-10-15

arxiv.org/abs/cond-mat/0310352v2

Journal of Applied Physics 96, 754 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, incl. 4 figures

Scientific paper

10.1063/1.1753664

An infinite array of parallel current-carrying wires is known, from the field of neutral particle optics, to produce an exponentially localized magnetic field when the current direction is antiparallel in adjacent wires. We show that a finite array of several tens of superconducting Nb nanowires can produce a peak magnetic field of 10mT that decays by a factor of 10^4 over a length scale of 500nm. Such an array is readily manufacturable with current technology, and is compatible with both semiconductor and superconducting quantum computer architectures. A series of such arrays can be used to individually address single single-spin or flux qubits spaced as little as 100nm apart, and can lead to quantum logic gate times of 5ns.

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