Noise and decoherence in quantum two-level systems

Details Noise and decoherence in quantum two-level systems Noise and decoherence in quantum two-level systems

2002-02-28

arxiv.org/abs/cond-mat/0202518v1

Physica Scripta T102, 147-154 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Proceedings of the Nobel Jubilee Symposium on Condensation and Coherence in Condensed Systems (Physica Scripta)

Scientific paper

10.1238/Physica.Topical.102a0014

Motivated by recent experiments with Josephson-junction circuits we reconsider decoherence effects in quantum two-level systems (TLS). On one hand, the experiments demonstrate the importance of 1/f noise, on the other hand, by operating at symmetry points one can suppress noise effects in linear order. We, therefore, analyze noise sources with a variety of power spectra, with linear or quadratic coupling, which are longitudinal or transverse relative to the eigenbasis of the unperturbed Hamiltonian. To evaluate the dephasing time for transverse 1/f noise second-order contributions have to be taken into account. Manipulations of the quantum state of the TLS define characteristic time scales. We discuss the consequences for relaxation and dephasing processes.

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