Excitation and coherent control of spin qudit modes in silicon carbide at room temperature
Excitation and coherent control of spin qudit modes in silicon carbide at room temperature
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DOI：
10.1038/s41467-019-09429-x
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发表时间：
2019-04-11
影响因子：
16.6
通讯作者：
Dyakonov, V
中科院分区：
文献类型：
--
作者：
Soltamov, V. A.;Kasper, C.;Dyakonov, V
量子感测和信息处理领域的挑战之一是选择性地寻址和相干操纵受到外部扰动的高度均匀的量子比特。在这里，我们提出了室温相干控制的高维量子比特，所谓的qudits，与空位相关的自旋在碳化硅富含核自旋同位素。除了在泵浦频率下激发光谱窄的量子点模式外，在电子自旋共振谱中还激发了其他几种模式，其相对位置取决于外部磁场。我们开发了一个多极自旋动力学理论，并展示了选择性量子控制的均匀自旋包与亚MHz的光谱分辨率。此外，我们进行两个频率的拉姆齐干涉，以证明绝对直流磁力，这是免疫热噪声和应变不均匀性。
One of the challenges in the field of quantum sensing and information processing is to selectively address and coherently manipulate highly homogeneous qubits subject to external perturbations. Here, we present room-temperature coherent control of high-dimensional quantum bits, the so-called qudits, associated with vacancy-related spins in silicon carbide enriched with nuclear spin-free isotopes. In addition to the excitation of a spectrally narrow qudit mode at the pump frequency, several other modes are excited in the electron spin resonance spectra whose relative positions depend on the external magnetic field. We develop a theory of multipole spin dynamics and demonstrate selective quantum control of homogeneous spin packets with sub-MHz spectral resolution. Furthermore, we perform two-frequency Ramsey interferometry to demonstrate absolute dc magnetometry, which is immune to thermal noise and strain inhomogeneity.