Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 19: Quanteninformation: Festkörper und Photonen

Q 19.9: Talk

Monday, March 12, 2012, 18:30–18:45, V38.04

Magnetic Strong Coupling of an Ensemble of NV- Defect Centers to a Superconducting Resonator — •Christian Koller, Robert Amsüss, Andreas Maier, Tobias Nöbauer, Stefan Putz, Jörg Schmiedmayer, and Johannes Majer — Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Vienna, Austria

Reversible transfer of quantum information between long-lived memories and quantum processors is a favorable building block of scalable quantum information devices. We present recent experimental results of strong coupling between an ensemble of nitrogen-vacancy center electron spins in diamond and a superconducting microwave coplanar waveguide resonator [1]. Although the coupling between a single spin and the electromagnetic field is typically rather weak, collective enhancement allows entering the strong coupling regime. We are able to directly observe this characteristic scaling of the collective coupling strength with the square root of the number of emitters. Additionally, we measured the hyperfine coupling to 13C nuclear spins, which is a first step towards a nuclear ensemble quantum memory. Using the dispersive shift of the cavity resonance frequency, we measured the relaxation time T1 of the NV center at millikelvin temperatures. In addition we will present recent results using novel lumped element resonators. [1]Amsüss et al., Phys. Rev. Lett. 107, 060502 (2011)