Shot Noise Spectrum of Open Dissipative Quantum Two-level Systems
arXiv:cond-mat/0310578 · doi:10.1103/PhysRevLett.92.206601
Abstract
We study the current noise spectrum of qubits under transport conditions in a dissipative bosonic environment. We combine (non-)Markovian master equations with correlation functions in Laplace-space to derive a noise formula for both weak and strong coupling to the bath. The coherence-induced reduction of noise is diminished by weak dissipation and/or a large level separation (bias). For weak dissipation, we demonstrate that the dephasing and relaxation rates of the two-level system can be extracted from noise. In the strong dissipation regime, the localisation-delocalisation transition becomes visible in the low-frequency noise.
4 pages, 3 figures, references added. To appear in PRL
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