Room-Temperature Defect Qubits in Ultrasmall Nanocrystals
Room-Temperature Defect Qubits in Ultrasmall Nanocrystals
复制标题
DOI：
10.1021/acs.jpclett.0c00052
复制
发表时间：
2020-03-05
影响因子：
5.7
通讯作者：
Gali, Adam
中科院分区：
文献类型：
--
作者：
Beke, David;Valenta, Jan;Gali, Adam
为了量子生物传感、生物分子超极化和量子信息处理，迫切需要在纳米尺寸、超小纳米晶体中实现室温量子比特。到目前为止，在纳米尺度上制备这样的量子比特仍然是徒劳的。在这里，我们提出了一种合成方法，它避免了固体与高能粒子的任何相互作用，并利用自蔓延高温合成和随后的电化学方法--无光子激子产生化学--在尺寸为3 nm的超小纳米晶体中高产率地产生了室温量子比特。我们首先通过高温合成的方法生成碳化硅晶体，然后进行湿法化学刻蚀，得到了超细的碳化硅纳米晶，有利于在材料中产生热稳定的缺陷量子位。我们展示了由这些纳米粒子产生的对比度为3.5%的双空位量子比特的室温光学检测磁共振信号，发射波长落在第二生物窗口(1000-1380 nm)内。这些结果构成了用于量子传感和有效超极化的非微扰生物制剂的形成。
There is an urgent quest for room-temperature qubits in nanometer-sized, ultrasmall nanocrystals for quantum biosensing, hyperpolarization of biomolecules, and quantum information processing. Thus far, the preparation of such qubits at the nanoscale has remained futile. Here, we present a synthesis method that avoids any interaction of the solid with high-energy particles and uses self-propagated high-temperature synthesis with a subsequent electrochemical method, the no-photon exciton generation chemistry to produce room-temperature qubits in ultrasmall nanocrystals of sizes down to 3 nm with high yield. We first create the host silicon carbide (SiC) crystallites by high-temperature synthesis and then apply wet chemical etching, which results in ultrasmall SiC nanocrystals and facilitates the creation of thermally stable defect qubits in the material. We demonstrate room-temperature optically detected magnetic resonance signal of divacancy qubits with 3.5% contrast from these nanoparticles with emission wavelengths falling in the second biological window (1000-1380 nm). These results constitute the formation of nonperturbative bioagents for quantum sensing and efficient hyperpolarization.