Qubit coherence control in a nuclear spin bath

2004/06/30 by Rogério de Sousa, Rogerio de Sousa, Neil Shenvi +1 · 4 citations
Physics and Astronomy · #Quantum and electron transport phenomena #Quantum optics and atomic interactions #Spectroscopy and Quantum Chemical Studies #cond-mat.mes-hall #cond-mat.stat-mech

paper · pdf · doi:10.1103/physrevb.72.045330

published as Phys. Rev. B 72, 045330 (2005)

openalex publication_date 2005/07/15 · arxiv created 2005/07/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Coherent dynamics of localized spins in semiconductors is limited by spectral diffusion arising from dipolar fluctuation of lattice nuclear spins. Here we extend the semiclassical theory of spectral diffusion for nuclear spins I=1∕2 to the high nuclear spins relevant to the III-V materials and show that applying successive qubit \ensuremathπ rotations at a rate approximately proportional to the nuclear spin quantum number squared (I²) provides an efficient method for coherence enhancement. Hence robust coherent manipulation in the large spin environments characteristic of the III-V compounds is possible without resorting to nuclear spin polarization, provided that the \ensuremathπ pulses can be generated at intervals scaling as I^\ensuremath-2.

Citations

• Single-shot read-out of an individual electron spin in a quantum dot

Cited by

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• Optimal generation of single-qubit operation from an always-on interaction by algebraic decoupling
• Long-time electron spin storage via dynamical suppression of hyperfine-induced decoherence in a quantum dot
• Quantum measurement of a mesoscopic spin ensemble

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