硅量子位中的铋：EPR抵消共振的作用
Bismuth in silicon qubits: the role of EPR cancellation resonances
摘要：
本文从理论和实验上研究了中等磁场下掺铋硅（Si：Bi）的电子顺磁共振谱。我们确定了一个以前未探索的EPR制度的“取消共振”-其中部分超精细耦合与外部场诱导分裂共振。我们表明，这种制度有有趣的和实验上可访问的结果光谱和量子信息应用。这些措施包括减少退相干，快速操纵的耦合核电子量子比特系统和线窄化的多量子比特的情况下。我们测试我们的理论分析与实验X波段（9.7 GHz）EPR光谱在中间场制度。
英文摘要：
We investigate theoretically and experimentally the electron paramagnetic resonance (EPR) spectra of bismuth doped silicon (Si:Bi) at intermediate magnetic fields, $B \approx 0.05 -0.6$ T. We identify a previously unexplored EPR regime of "cancellation-resonances"- where part of the hyperfine coupling is resonant with the external field-induced splitting. We show this regime has interesting and experimentally accessible consequences for spectroscopy and quantum information applications. These include reduction of decoherence, fast manipulation of the coupled nuclear-electron qubit system and line narrowing in the multi-qubit case. We test our theoretical analysis by comparing with experimental X-band (9.7 GHz) EPR spectra obtained in the intermediate field regime.
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