Multiple-pulse coherence enhancement of solid state spin qubits

Details Multiple-pulse coherence enhancement of solid state spin qubits Multiple-pulse coherence enhancement of solid state spin qubits

2006-04-25

arxiv.org/abs/cond-mat/0604577v2

Phys. Rev. Lett. 98, 077601 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.98.077601

We describe how the spin coherence time of a localized electron spin in solids, i.e. a solid state spin qubit, can be prolonged by applying designed electron spin resonance pulse sequences. In particular, the spin echo decay due to the spectral diffusion of the electron spin resonance frequency induced by the non-Markovian temporal fluctuations of the nuclear spin flip-flop dynamics can be strongly suppressed using multiple-pulse sequences akin to the Carr-Purcell-Meiboom-Gill pulse sequence in nuclear magnetic resonance. Spin coherence time can be enhanced by factors of 4-10 in GaAs quantum dot and Si:P quantum computer architectures using composite sequences with an even number of pulses.

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