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TT: Fachverband Tiefe Temperaturen

TT 30: TR: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)

TT 30.2: Talk

Wednesday, March 16, 2011, 10:45–11:00, HSZ 03

Coherent dynamics of two microscopic defect states coupled via a phase qubit — •Grigorij J. Grabovskij¹, Pavel Bushev¹, Jared H. Cole^2,3, Clemens Müller^4,3, Jürgen Lisenfeld¹, Alexander Lukashenko¹, and Alexey V. Ustinov^1,3 — ¹Physikalisches Institut, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ²Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ³DFG-Center for Functional Nanostructures (CFN), D-76128 Karlsruhe, Germany — ⁴Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany

We report on the experimental demonstration of induced coherent interaction between two intrinsic two-level defect states (TLSs) via a phase qubit. During the implementation of the pulse sequence the tunable qubit serves as a quantum shuttle communicating quantum information between the two TLSs. We present a detailed comparison between experiment and theory and find excellent agreement over a wide range of parameters. We then use the theoretical model to study the creation and movement of entanglement between the three components of the system.