Numerical Modeling of the Central Spin Problem Using the Spin-Coherent-State P Representation

Journal Article · Sun Jan 01 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.97.037204· OSTI ID:1003653

Al Hassanieh, Khaled A ^[1]; Dobrovitski, V. V. ^[2]; Dagotto, Elbio R ^[1]; Harmon, B. N. ^[2]

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1. ORNL
2. Ames Laboratory

In this work, we consider decoherence of a central spin by a spin bath. In order to study the nonperturbative decoherence regimes, we develop an efficient mean-field-based method for modeling the spin-bath decoherence, based on the P representation of the central spin density matrix. The method can be applied to longitudinal and transverse relaxation at different external fields. In particular, by modeling large-size quantum systems (up to 16 000 bath spins), we make controlled predictions for the slow long-time decoherence of the central spin.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003653
• Journal Information: Physical Review Letters, Vol. 97, Issue 3; ISSN 0031--9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DENSITY MATRIX
RELAXATION
SIMULATION
SPIN
numerical modeling
central spin
spin coherent state p