Cavity QED with Magnetically Coupled Collective Spin States

R. Amsüss, Ch. Koller, T. Nöbauer, S. Putz, S. Rotter, K. Sandner, S. Schneider, M. Schramböck, G. Steinhauser, H. Ritsch, J. Schmiedmayer, and J. Majer
Phys. Rev. Lett. 107, 060502 – 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 C13 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.

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  • Received 5 March 2011


© 2011 American Physical Society

Authors & Affiliations

R. Amsüss1, Ch. Koller1,2, T. Nöbauer1, S. Putz1, S. Rotter3, K. Sandner4, S. Schneider1, M. Schramböck1,2, G. Steinhauser1, H. Ritsch4, J. Schmiedmayer1, and J. Majer1,2,*

  • 1Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
  • 2Center for Micro- and Nanostructures ZNMS, TU Wien, 1040 Vienna, Austria
  • 3Institute for Theoretical Physics, TU Wien, 1040 Vienna, Austria
  • 4Institute for Theoretical Physics, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria

  • *

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Vol. 107, Iss. 6 — 5 August 2011

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