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Decoherence by quantum telegraph noise: A numerical evaluation

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Citation

Abel, B., & Marquardt, F. (2008). Decoherence by quantum telegraph noise: A numerical evaluation. PHYSICAL REVIEW B, 78(20): 201302. doi:10.1103/PhysRevB.78.201302.


Cite as: http://hdl.handle.net/21.11116/0000-0001-D8AE-8
Abstract
We investigate the time evolution of a charge qubit subject to quantum telegraph noise produced by a single electronic defect level. We obtain results for the time evolution of the coherence that are strikingly different from the usual case of a harmonic-oscillator bath (Gaussian noise). When the coupling strength crosses a certain temperature-dependent threshold, we observe coherence oscillations in the strong-coupling regime. Moreover, we present the time evolution of the echo signal in a spin-echo experiment. Our analysis relies on a numerical evaluation of the exact solution for the density matrix of the qubit.