Geometric phases in semiconductor spin qubits: Manipulations and decoherence

Details Geometric phases in semiconductor spin qubits: Manipulations and decoherence Geometric phases in semiconductor spin qubits: Manipulations and decoherence

2007-10-21

arxiv.org/abs/0710.3931v2

Phys. Rev. B 77, 045305 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages, 8 figures, published version

Scientific paper

10.1103/PhysRevB.77.045305

We describe the effect of geometric phases induced by either classical or quantum electric fields acting on single electron spins in quantum dots in the presence of spin-orbit coupling. On one hand, applied electric fields can be used to control the geometric phases, which allows performing quantum coherent spin manipulations without using high-frequency magnetic fields. On the other hand, fluctuating fields induce random geometric phases that lead to spin relaxation and dephasing, thus limiting the use of such spins as qubits. We estimate the decay rates due to piezoelectric phonons and conduction electrons in the circuit, both representing dominant electric noise sources with characteristically differing power spectra.

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