Single-qubit gates and measurements in the surface acoustic wave quantum computer

Details Single-qubit gates and measurements in the surface acoustic wave quantum computer Single-qubit gates and measurements in the surface acoustic wave quantum computer

2004-06-07

arxiv.org/abs/cond-mat/0406167v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 10 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.205320

In the surface acoustic wave quantum computer, the spin state of an electron trapped in a moving quantum dot comprises the physical qubit of the scheme. Via detailed analytic and numerical modeling of the qubit dynamics, we discuss the effect of excitations into higher-energy orbital states of the quantum dot that occur when the qubits pass through magnetic fields. We describe how single-qubit quantum operations, such as single-qubit rotations and single-qubit measurements, can be performed using only localized static magnetic fields. The models provide useful parameter regimes to be explored experimentally when the requirements on semiconductor gate fabrication and the nanomagnetics technology are met in the future.

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