Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Austria.
Phys Rev Lett. 2011 Aug 5;107(6):060502. doi: 10.1103/PhysRevLett.107.060502. Epub 2011 Aug 3.
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 (13)C 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.
我们报告了钻石中氮空位中心电子自旋集合与超导微波共面波导谐振器之间的强耦合。直接观察到了集体耦合强度与发射器数量的平方根的特征比例关系。此外，我们还测量了与（13）C 核自旋的超精细耦合，这是迈向核集合量子存储器的第一步。利用腔共振频率的色散位移，我们以非破坏性的方式测量了毫开尔文温度下 NV 中心的弛豫时间。
