排序方式: 共有16条查询结果,搜索用时 15 毫秒
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We study the time evolution of two electron spin states in a double quantum-dot system, which includes a nearby quantum point contact (QPC) as a measurement device. We find that the QPC measurement induced decoherence is in the microsecond timescale. We also find that the enhanced QPC measurement will trap the system in its initial spin states, which is consistent with the quantum Zeno effect. 相似文献
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该文主要介绍了量子计算机研究的历史和现状。强调发展大规模的量子计算和实现强关联多体系统的量子模拟,是当前量子计算研究的主流。文章主体部分主要介绍了量子计算机硬件研究方面的进展,主要聚焦于几个具有qubit可集成性的量子系统:量子点系统、超导约瑟夫森结系统、离子阱系统、腔量子电动力学系统,作为实现量子计算机的最主要的候选系统,上述方向的研究吸引了国际上研究量子计算的最主要的力量。我们调研了在这些系统中,在qubit表征、操控方面最具代表性的进展,以及在实现大规模量子计算道路上的困难,和可能的解决办法。 相似文献
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We have measured the temperature dependence of the resistance Rxx and Rxy of a two-dimensional electron system in the regime of the quantum Hall plateau transition. We observe for our sample a considerable large critical exponent κ~ 0.66 - 0.77, which may be due to the dominant electron-phonon scattering. Further we find a simple exponential form of Rxx = Rc exp(-s) in agreement with the theoretically proposed universal scaling function. 相似文献
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High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots 下载免费PDF全文
Le-Tian Zhu 《中国物理 B》2022,31(12):120302-120302
Single-electron spins in quantum dots are the leading platform for qubits, while magnons in solids are one of the emerging candidates for quantum technologies. How to manipulate a composite system composed of both systems is an outstanding challenge. Here, we use spin-charge hybridization to effectively couple the single-electron spin state in quantum dots to the cavity and further to the magnons. Through this coupling, quantum dots can entangle and detect magnon states. The detection efficiency can reach 0.94 in a realistic experimental situation. We also demonstrate the electrical tunability of the scheme for various parameters. These results pave a practical pathway for applications of composite systems based on quantum dots and magnons. 相似文献
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该文主要介绍了量子计算机研究的历史和现状.强调发展大规模的量子计算和实现强关联多体系统的量子模拟,是当前量子计算研究的主流.文章主体部分主要介绍了量子计算机硬件研究方面的进展,主要聚焦于几个具有qubit可集成性的量子系统:量子点系统、超导约瑟夫森结系统、离于阱系统、腔量子电动力学系统,作为实现量子计算机的最主要的候选系统,上述方向的研究吸引了国际上研究量子计算的最主要的力量.我们调研了在这些系统中,在qubit表征,操控方面最具代表性的进展,以及在实现大规模量子计算道路上的困难,和可能的解决办法. 相似文献
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