Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Quantum effects: QED II

Q 56.1: Talk

Friday, March 21, 2014, 10:30–10:45, DO26 208

Inducing coherent oscillations between a superconducting resonator and an ensemble of NV spins I. Experiment — •Stefan Putz¹, Dmitry Krimer², Robert Amsüss¹, Abhilash Valookaran¹, Jörg Schmiedmayer¹, Stefan Rotter², and Johannes Majer¹ — ¹Atominstitut, Vienna University of Technology, Vienna, Austria — ²Institute for Theoretical Physics, Vienna University of Technology, Vienna, Austria

Hybrid quantum systems are promising candidates for robust experiments in cavity quantum electrodynamics and for future technologies involving the processing of quantum information. A particularly attractive system in this respect is realized by strongly coupling an ensemble of spins to a cavity, which enables both the storage and the transfer of quantum information. Here we report on the observation of coherent oscillations between a superconducting resonator in the microwave regime and a large ensemble of diamond nitrogen vacancy (NV) spins deeply in the strong coupling regime. Inhomogeneous broadening in the spin ensemble and its effects on the dynamical behavior are modeled by solving Volterra integral equations as discussed in the subsequent talk. These numerical calculations show good agreement with our experimental results, and underline that a precise knowledge of the inhomogeneous spin distribution is crucial for the understanding of time domain measurements. Furthermore, we show experimentally that a reduction of the coupling strength leads to a transition between non-Markovian and Markovian decay regimes.