Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: TR: Quantum Coherence and Quantum Information Systems 2 (jointly with MA and HL)

TT 34.12: Talk

Wednesday, March 16, 2011, 17:15–17:30, HSZ 03

Deterministic creation and stabilization of entanglement in circuit QED by homodyne-mediated feedback control — Zhuo Liu², Lülin Kuang², Kai Hu², Luting Xu², Suhua Wei², Xinqi Li², and •Lingzhen Guo^1,2 — ¹Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ²Department of Physics, Beijing Normal University, Beijing 100875, China

In a solid-state circuit QED system, we demonstrate that a homodyne-current-based feedback can create and stabilize highly entangled two-qubit states in the presence of a moderate noisy environment. Particularly, we present an extended analysis for the current-based Markovian feedback, which leads to an improved feedback scheme. We show that this is essential to achieve a desirable control effect by the use of dispersive measurement.