Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
Phys Rev Lett. 2013 Sep 20;111(12):127003. doi: 10.1103/PhysRevLett.111.127003.
We report the observation of strong coupling between the exchange-coupled spins in a gallium-doped yttrium iron garnet and a superconducting coplanar microwave resonator made from Nb. The measured coupling rate of 450 MHz is proportional to the square root of the number of exchange-coupled spins and well exceeds the loss rate of 50 MHz of the spin system. This demonstrates that exchange-coupled systems are suitable for cavity quantum electrodynamics experiments, while allowing high integration densities due to their spin densities of the order of one Bohr magneton per atom. Our results furthermore show, that experiments with multiple exchange-coupled spin systems interacting via a single resonator are within reach.
我们报告了在掺镓钇铁石榴石中的交换耦合自旋与由 Nb 制成的超导共面微波谐振器之间的强耦合的观测结果。所测量的耦合速率为 450 MHz，与交换耦合自旋的数量的平方根成正比，并且远远超过了自旋系统的 50 MHz 的损耗速率。这表明交换耦合系统适合腔量子电动力学实验，同时由于其自旋密度约为每个原子一个玻尔磁子，因此允许高集成密度。我们的结果还表明，通过单个谐振器相互作用的多个交换耦合自旋系统的实验是可行的。
