Dynamics and control of a qubit in spin environment: an exact master equation study

2016/01/26 by Jun Jing, Lian-Ao Wu, Jing, Jun +1
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum and electron transport phenomena

paper · pdf · doi:10.48550/arxiv.1601.07197

openalex publication_date 2016/01/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We present an exact master equation for a central spin-1/2 system coupled to a spin-1/2 bath in terms of hyperfine interaction, which provides a unified formalism for both free evolution and controlled dynamics of the central spin. The equation enables us to study controllability of dynamics processes with various degrees of non-Markovianity. We investigate the Overhauser's effect on decoherence dynamics of the central spin under different bath spectra and the system-bath coupling strengths. Nonperturbative leakage elimination approach is applied to the system to suppress decoherence in solid-state quantum information processing.

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