Phys. Rev. Lett. 107, 060502 (2011) [5 pages]Cavity QED with Magnetically Coupled Collective Spin StatesReceived 5 March 2011; revised 3 May 2011; published 3 August 2011 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 of the NV center at millikelvin temperatures in a nondestructive way. © 2011 American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.107.060502
DOI:
10.1103/PhysRevLett.107.060502
PACS:
03.67.Lx, 42.50.Pq, 61.72.jn, 76.30.-v
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