Selective protected state preparation of coupled dissipative quantum emitters.
Selective protected state preparation of coupled dissipative quantum emitters.
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DOI：
10.1038/srep16231
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发表时间：
2015-11-09
影响因子：
4.6
通讯作者：
Genes C
中科院分区：
文献类型：
--
作者：
Plankensteiner D;Ostermann L;Ritsch H;Genes C
量子发射体系综中固有的二元或集体相互作用引起其本征态的能量和寿命的扩展。虽然这通常会导致快速衰减和退相，但在许多情况下，可以发现某些具有最小衰减的特殊纠缠集体态，这些纠缠集体态具有光谱学，精密测量或信息存储的理想特性。我们表明，对于一个特定的选择的激光频率，功率和几何形状或一个合适的配置的控制字段可以有效地准备这些状态。我们证明了这一点，通过研究的偶极-偶极耦合发射链的强subradiant纠缠态的制备方案。通过空间激发相位工程或定制磁场进一步提高了制备态的保真度和纠缠深度。
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.