Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 13: Transport - Quantum Coherence and Quantum Information Systems
TT 13.13: Vortrag
Samstag, 5. März 2005, 12:00–12:15, TU H3027
Spectroscopy of a driven solid-state qubit and its detector — •M. Thorwart1, M.C. Goorden2, and M. Grifoni3 — 1Universität Düsseldorf — 2Universiteit Leiden, The Netherlands — 3Universität Regensburg
We study the asymptotic dynamics of a driven quantum two-level system coupled via a quantum detector to the environment [1]. We find multi-photon resonances which are due to the entanglement of the qubit and the detector. Different regimes are studied by employing a perturbative Floquet-Born-Markov approach for the qubit+detector system, as well as non-perturbative real-time path integral schemes for the driven spin-boson system. We find analytical results for the resonances, including the red and the blue sidebands which have been observed in superconducting flux-qubit-SQUID systems [2]. The analytical results agree well with those of exact ab-initio real-time path-integral calculations.
| [1] | M.C. Goorden, M. Thorwart, and M. Grifoni, Phys. Rev. Lett., |
| in press. | |
| [2] | I. Chiorescu, P. Bertet, K. Semba, Y. Nakamura, |
| C.J.P.M. Harmans, and J.E. Mooij, Nature 431, 159 (2004). |