Plankensteiner D, Ostermann L, Ritsch H, Genes C
Institut für Theoretische Physik, Universität Innsbruck, Technikerstrasse 21a, A-6020 Innsbruck, Austria.
Sci Rep. 2015 Nov 9;5:16231. doi: 10.1038/srep16231.
Inherent binary or collective interactions in ensembles of quantum emitters induce a spread in the energy and lifetime of their eigenstates. While this typically causes fast decay and dephasing, in many cases certain special entangled collective states with minimal decay can be found, which possess ideal properties for spectroscopy, precision measurements or information storage. We show that for a specific choice of laser frequency, power and geometry or a suitable configuration of control fields one can efficiently prepare these states. We demonstrate this by studying preparation schemes for strongly subradiant entangled states of a chain of dipole-dipole coupled emitters. The prepared state fidelity and its entanglement depth is further improved via spatial excitation phase engineering or tailored magnetic fields.
量子发射器集合中的固有二元或集体相互作用会导致其本征态的能量和寿命出现展宽。虽然这通常会导致快速衰减和退相，但在许多情况下，可以找到某些具有最小衰减的特殊纠缠集体态，它们具有用于光谱学、精密测量或信息存储的理想特性。我们表明，对于激光频率、功率和几何结构的特定选择或控制场的合适配置，可以有效地制备这些态。我们通过研究偶极 - 偶极耦合发射器链的强亚辐射纠缠态的制备方案来证明这一点。通过空间激发相位工程或定制磁场，制备态的保真度及其纠缠深度会进一步提高。
