A Clock Transition in the Cr7Mn Molecular Nanomagnet
A Clock Transition in the Cr7Mn Molecular Nanomagnet
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DOI：
10.3390/magnetochemistry5010004
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发表时间：
2019-03-01
期刊：
影响因子：
2.7
通讯作者：
Friedman, Jonathan R.
中科院分区：
文献类型：
--
作者：
Collett, Charles A.;Ellers, Kai-Isaak;Friedman, Jonathan R.
一个可行的量子比特必须有很长的相干时间T-2。在分子纳米磁体中，T-2在低温下经常受到偶极和超精细相互作用的存在的限制，这种相互作用通常在合成过程中通过样品稀释、化学工程和同位素替代来缓解。原子钟跃迁通过降低工作跃迁对场波动的有效敏感性，提供了另一种减少环境场消相干的途径。Cr7Mn分子纳米磁体是一种异金属环，具有零场时钟跃迁的特点。对经共结晶稀释的Cr7Mn样品的连续波和自旋回波电子自旋共振实验都证明了时钟跃迁的影响，在1.8K时，T-2的最大值接近390 ns。我们讨论了对实验的改进，可能会进一步提高T-2。
A viable qubit must have a long coherence time T-2. In molecular nanomagnets, T-2 is often limited at low temperatures by the presence of dipole and hyperfine interactions, which are often mitigated through sample dilution, chemical engineering and isotope substitution in synthesis. Atomic-clock transitions offer another route to reducing decoherence from environmental fields by reducing the effective susceptibility of the working transition to field fluctuations. The Cr7Mn molecular nanomagnet, a heterometallic ring, features a clock transition at zero field. Both continuous-wave and spin-echo electron-spin resonance experiments on Cr7Mn samples, diluted via co-crystallization, show evidence of the effects of the clock transition with a maximum T-2 similar to 390 ns at 1.8 K. We discuss improvements to the experiment that may increase T-2 further.