任意自旋的可逆量子测量
Reversible quantum measurement with arbitrary spins
摘要：
我们提出了一种利用自旋j探针通过伊辛相互作用对任意自旋s系统进行物理可逆的量子测量。在自旋为1/2的系统（s=1/2）的情况下，我们明确地构建了一个反向测量和评估的保真度方面的可逆性的程度。当探针具有高自旋（j>1/2）时，测量状态的恢复是显著的，因为在可逆测量和反向测量期间保真度急剧变化。我们还证明了自旋为1/2的系统的反向测量方案可以作为实验上可行的高自旋系统（s>1/2）的近似反向测量方案。如果相互作用足够弱，反向测量几乎可以确定地恢复猫态，尽管有很大的保真度变化。
英文摘要：
We propose a physically reversible quantum measurement of an arbitrary spin-s system using a spin-j probe via an Ising interaction. In the case of a spin-1/2 system (s=1/2), we explicitly construct a reversing measurement and evaluate the degree of reversibility in terms of fidelity. The recovery of the measured state is pronounced when the probe has a high spin (j>1/2), because the fidelity changes drastically during the reversible measurement and the reversing measurement. We also show that the reversing measurement scheme for a spin-1/2 system can serve as an experimentally feasible approximate reversing measurement for a high-spin system (s>1/2). If the interaction is sufficiently weak, the reversing measurement can recover a cat state almost deterministically in spite of there being a large fidelity change.
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