福克态视角下的弱测量放大

Weak measurement amplification under Fock-state view

利用弱测量方法研究任意量子态指针的放大效应。当指针态是偶宇称态时,在动量空间或者位置空间中,不仅可以给出指针的微弱平均平移的放大解析式,也可以给出其最大放大值。表明这类偶宇称态使得弱测量放大有了精确解,从而更容易找到放大极限。这些结果不仅丰富了弱测量理论,也加深了人们对弱测量的理解。

Weak measurement method is used to study the amplification effect of quantum pointer in arbitrary quantum states. When the states of quantum pointer are even parity states, in the momentum space or position space, not only the amplification formula of the weak average displacement of the pointer can be given, but also the maximum amplification values can be given. It shows that this kind of even parity states make the weak measurement amplification have accurate solutions, thus it is easier to find the amplification limit. Therefore, these results not only enrich the weak measurement theory, but also deepen people’s understanding of weak measurement.