Bang-Bang control of a qubit coupled to a quantum critical spin bath

Details Bang-Bang control of a qubit coupled to a quantum critical spin bath Bang-Bang control of a qubit coupled to a quantum critical spin bath

2008-02-20

arxiv.org/abs/0802.2859v2

Phys. Rev. A 77, 052112 (2008)

Physics

Quantum Physics

10 pages, 4 figures, replaced with published version

Scientific paper

10.1103/PhysRevA.77.052112

We analytically and numerically study the effects of pulsed control on the decoherence of a qubit coupled to a quantum spin bath. When the environment is critical, decoherence is faster and we show that the control is relatively more effective. Two coupling models are investigated, namely a qubit coupled to a bath via a single link and a spin star model, yielding results that are similar and consistent.

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