Entanglement Spectroscopy of a Driven Solid-State Qubit and Its Detector

• DOI: 10.1103/physrevlett.93.267005
• Publication Date: 2004-12-22T09:29:50Z
• Authors: M. C. Goorden; M. Thorwart; M. Grifoni
• Keywords: Superconductivity (cond-mat.supr-con); Condensed Matter - Mesoscale and Nanoscale Physics; Condensed Matter - Superconductivity; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); 0103 physical sciences; FOS: Physical sciences; 530 Physik; 01 natural sciences; 7. Clean energy

4 pages, 4 figures<br/>We study the asymptotic dynamics of a driven quantum two level system coupled via a quantum detector to the environment. 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. They agree well with those of exact ab-initio calculations.<br/>