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arXiv · 1103.1045

Cavity QED with magnetically coupled collective spin states

Robert Amsüss·Christian Koller·Tobias Nöbauer·Stefan Putz·Stefan Rotter·Kathrin Sandner·Stephan Schneider·Matthias Schramböck·Georg Steinhauser·Helmut Ritsch·Jörg Schmiedmayer·Johannes Majer
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Abstract

We report strong coupling between an ensemble of nitrogen-vacancy center electron spins in diamond and a superconducting microwave coplanar waveguide resonator. The characteristic scaling of the collective coupling strength with the square root of the number of emitters is observed directly. Additionally, we measure 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 measure the relaxation time T1 of the NV center at millikelvin temperatures in a non-destructive way.

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Robert Amsüss, Christian Koller, Tobias Nöbauer, Stefan Putz, Stefan Rotter, Kathrin Sandner, Stephan Schneider, Matthias Schramböck, Georg Steinhauser, Helmut Ritsch, Jörg Schmiedmayer, Johannes Majer. 2011-08-24. Cavity QED with magnetically coupled collective spin states. https://doi.org/10.1103/physrevlett.107.060502

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