Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Quantum Coherence, Quantum Information Systems 2
TT 42.7: Vortrag
Mittwoch, 13. März 2013, 16:30–16:45, H18
Coupling a donor based spin ensemble to superconducting circuits — •Christoph W. Zollitsch1,2, Moritz Greifenstein2, Alexander Backs2, Felix Hoehne3, Martin S. Brandt3, Rudolf Gross1,2, and Hans Huebl1 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching — 2Physik-Department, Technische Universität München, Garching — 3Walter Schottky Institut, Technische Universität München, Garching
The realization of solid state based quantum systems has been successful using various approaches, e.g. superconducting qubits, NV centers or quantum dot systems. The coupling of different systems in hybrid systems allows to exploit their individual advantages. To allow a coherent information transfer between two quantum systems strong coupling is required, i.e. the effective coupling geff needs to exceed the loss mechanisms of both contributing systems. We study the coupling between a superconducting coplanar niobium microwave resonator and an ensemble of uncoupled electron spins of phosphorus donors in natural silicon. We perform microwave transmission spectroscopy of the resonator at millikelvin temperatures as a function of the magnetic field and observe the onset of an avoided level crossing. By analyzing the evolution of the linewidth near the level degeneracy we find geff/(2π) = 1.3 MHz. The loss rate of the spin system and the resonator are determined to γ/(2π) = 10 MHz and κ/(2π) = 0.3 MHz, respectively. We also discuss the temperature and power dependence of geff.
Financial support via SFB 631 and NIM is gratefully acknowledged.