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Engineering closed optical transitions in rare-earth ion crystals

机译：工程稀土离子晶体中的封闭光学跃迁

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摘要

We propose a protocol to preserve the spin state of rare-earth ions when they are optically cycled. This technique uses large magnetic fields to increase the probability of an optically excited ion returning to its initial spin state. This Zeeman enhanced cyclicity is shown to be applicable to non-Kramers ions in various crystals irrespective of the site symmetry. The specific example of Pr~(3+):Y_2SiO_5 is investigated to demonstrate that the protocol can create closed optical transitions even where the point group symmetry of the site is C_1. In this example, the predicted cyclicity exceeds 10~4. This high level of cyclicity extends the usefulness of rare-earth ion crystals for applications in quantum and classical information processing. We explore the use of this technique to enable single-ion, spin-state optical readout and the creation of ensemble-based spectral features that are robust against optical cycling.
机译：我们提出了一种协议，以在稀土离子进行光学循环时保留其自旋状态。该技术使用大磁场来增加光激发离子返回其初始自旋状态的可能性。已证明这种Zeeman增强的循环性适用于各种晶体中的非Kramer离子，而与位点对称性无关。研究了Pr〜（3 +）：Y_2SiO_5的特定示例，以证明该协议即使在该点的点组对称为C_1的情况下也可以创建封闭的光学跃迁。在该示例中，预测的周期性超过10〜4。这种高水平的循环性扩展了稀土离子晶体在量子和经典信息处理中的应用范围。我们探索这种技术的使用，以实现单离子，自旋态光学读出以及创建基于集合的光谱特征，这些特征对光学循环具有鲁棒性。

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  • 来源
    《Physical review》 |2016年第1期|014401.1-014401.14|共14页
  • 作者

    John G. Bartholomew; Rose L. Ahlefeldt; Matthew J. Sellars;

  • 作者单位

    Centre for Quantum Computation and Communication Technology, Laser Physics Centre, The Australian National University, Canberra, Australian Capital Territory 2601, Australia,PSL Research University, Chimie ParisTech CNRS, Institut de Recherche de Chimie Paris, 75005 Paris, France;

    Centre for Quantum Computation and Communication Technology, Laser Physics Centre, The Australian National University, Canberra, Australian Capital Territory 2601, Australia,Department of Physics, Montana State University, Bozeman, MT 59717;

    Centre for Quantum Computation and Communication Technology, Laser Physics Centre, The Australian National University, Canberra, Australian Capital Territory 2601, Australia;

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