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Single-spin measurement by magnetic resonance force microscopy: Effects of measurement device, thermal noise and spin relaxation

机译:通过磁共振力显微镜进行单自旋测量:测量装置的影响,热噪声和旋转松弛

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Single-spin measurement is an extremely important challenge, and necessary for the future successful development of several recent spin-based proposals for quantum information processing. Magnetic resonance force microscopy (MRFM) has been suggested as a promising technique for single-spin detection. We discuss how to read out the quantum state of a single spin using the MRFM technique based on cyclic adiabatic inversion (CAI). We include, in our analysis, a measurement device (an optical interferometer) to monitor the position of the cantilever, which then provides us with information of the spin state. We consider various relevant sources of noise and taken into account the effect of spin relaxation on the single-spin detection scheme. We also present a realistic continuous measurement model, and discuss the approximations and conditions to achieve a quantum non-demolition measurement of a single spin by MRFM. Finally we will present some simulation results for the single-spin measurement process.
机译:单自旋测量是一个极为重要的挑战,并且必须为未来的数量信息处理的基于自旋的基于建议的未来成功开发所必需的。已经提出磁共振力显微镜(MRFM)作为用于单自旋检测的有希望的技术。我们讨论如何使用基于循环绝热反转(CAI)的MRFM技术读出单一旋转的量子状态。我们包括在我们的分析中,测量装置(光学干涉仪)监测悬臂的位置,然后向我们提供旋转状态的信息。我们考虑了各种相关的噪音来源,并考虑了旋转弛豫对单自旋检测方案的影响。我们还提出了一种现实的连续测量模型,并讨论了通过MRFM实现单次旋转的量子非拆除测量的近似和条件。最后,我们将为单自动化测量过程提供一些模拟结果。

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