3. Physikalisches Institut, Universität Stuttgart and Stuttgart Research Center of Photonic Engineering (SCoPE), Pfaffenwaldring 57, Stuttgart D-70569, Germany.
Phys Rev Lett. 2013 Sep 20;111(12):120502. doi: 10.1103/PhysRevLett.111.120502.
We report on optical detection of a single photostable Ce(3+) ion in an yttrium aluminium garnet (YAG) crystal and on its magneto-optical properties at room temperature. The spin quantum state of the emitting level of a single cerium ion in YAG can be initialized by a circularly polarized laser pulse. Coherent precession of the electron spin is read out by observing temporal behavior of circularly polarized fluorescence of the ion. This implies direct mapping of the spin quantum state of Ce(3+) ion onto the polarization state of the emitted photon and represents the quantum interface between a single spin and a single photon.
我们报告了在钇铝石榴石（YAG）晶体中对单个光稳定 Ce(3+) 离子的光学检测及其在室温下的磁光性质。YAG 中单个铈离子发射能级的自旋量子态可以通过圆偏振激光脉冲初始化。通过观察离子的圆偏振荧光的时间行为，可以读出电子自旋的相干进动。这意味着 Ce(3+) 离子的自旋量子态可以直接映射到发射光子的偏振态上，并且代表了单个自旋和单个光子之间的量子接口。
