Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 5: Transport: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)

TT 5.4: Vortrag

Montag, 26. März 2012, 10:15–10:30, BH 243

Four-level lasing in the two-qubit system — •Sergey Shevchenko^1,2, Simon van der Ploeg², Miroslav Grajcar^2,3, Evgeniy Temchenko¹, Alexandr Omelyanchouk¹, Evgeniy Il’ichev², and Hans-Georg Meyer² — ¹Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine — ²Institute of Photonic Technology, Jena, Germany — ³Comenius University, Bratislava, Slovakia

The system of two coupled qubits can be described as a quantum four-level system. To make it useful for applications, e.g. for lasing, the hierarchy of relaxation times is needed. Such a situation occurs naturally in a case of two coupled superconducting qubits [1]. We have studied both experimentally and theoretically resonant excitation and relaxation in this system [1,2]. Two types of the multi-photon transitions were demonstrated: the direct and the ladder-type ones. This can be used for the creation of the inverse population, which was discussed in relation to the possibility of three- and four-level lasing in the system [2].
E. Il’ichev, S.N. Shevchenko, S.H.W. van der Ploeg, M. Grajcar, E.A. Temchenko, A.N. Omelyanchouk, and H.-G. Meyer, Phys. Rev. B 81, 012506 (2010).
E. A. Temchenko, S. N. Shevchenko, A. N. Omelyanchouk, Phys. Rev. B 83, 144507 (2011).