Driven Tunneling Dynamics: Bloch-Redfield Theory versus Path Integral Approach

Abstract

In the regime of weak bath coupling and low temperature we demonstrate numerically for the spin-boson dynamics the equivalence between two widely used but seemingly different roads of approximation, namely the path integral approach and the Bloch-Redfield theory. The excellent agreement between these two methods is corroborated by a novel efficient analytical high-frequency approach: it well approximates the decay of quantum coherence via a series of damped coherent oscillations. Moreover, a suitably tuned control field can selectively enhance or suppress quantum coherence.

4 pages including 3 figures, submitted for publication

References in corpus (2)

• Quantum Computing
• Generalized Bloch equations for a strongly driven tunneling system

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