Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Quantum Coherence and Quantum Information Systems I
TT 3.12: Vortrag
Montag, 26. März 2007, 12:45–13:00, H20
Nonlinear interaction and two-mode squeezing with superconducting flux qubits. — Matteo Mariantoni1, Frank Deppe1, Rudolf Gross1, Frank Wilhelm2, and •Enrique Solano3,4 — 1Walther-Meissner-Institut, Garching, Germany — 2IQC and University of Waterloo, Waterloo, Canada — 3Ludwig-Maximilians-Universität, Munich, Germany — 4Pontificia Universidad Católica del Perú, Lima, Peru
The interaction between superconducting quantum circuits and on-chip microwave resonators represents a rich field of research. We focus on the general, nonlinear interaction of a superconducting flux qubit with three modes of a coplanar wave-guide resonator and show how to implement, through suitable resonant conditions, a first-order Hamiltonian that yields nondegenerate, two-mode squeezing of the cavity field. Furthermore, we study the coherent properties of this engineered interaction and prove that it is able to generate a high degree of entanglement, while approaching perfect squeezing at the cavity output. Finally, we consider a realistic scenario including the presence of decoherence effects to evaluate the robustness of the proposed squeezing mechanism. This work is partially supported by the DFG via SFB 631.