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The power of a control qubit in weak measurements

机译:弱测量中控制量子位的功率

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摘要

In the late 80 s, a curious effect suggested by Aharanov et al. was found to lead to an anomalous amplification based on quantum measurements of weakly coupled systems. In this paper, we investigate the quantum control of the weak value amplification of a qubit system coupled to a meter. For the qubit system, the coupling occurs via a second non-interacting qubit, initially quantum correlated with the first one. We show that for weak measurements, the control can be remotely realized via the post-selected state of the second qubit or the degree of squeezing of the meter. In our study of the quantum control of the amplification, we can easily manipulate the degree of quantum correlations between the initially correlated qubits. We find that the degree of entanglement has no effect on the quantum control of the amplification. However, we also found a clear connection between the amplification and quantum discord like measurements as well as classical correlations between the qubits. Finally, we suggest an application of the amplification control on the enhancement of the quantum measurement accuracy, e.g. measuring the relative phase of the post-selected control qubit in a more precise way, as opposed to the non-amplified case.
机译:在80年代后期,Aharanov等人提出了一种奇怪的效果。发现基于弱耦合系统的量子测量结果会导致异常放大。在本文中,我们研究了耦合到仪表的量子比特系统的弱值放大的量子控制。对于量子位系统,耦合通过第二个非相互作用的量子位发生,该量子位最初与第一个量子位相关。我们表明,对于较弱的测量,可以通过第二个量子位的后选择状态或仪表的挤压程度来远程实现控制。在我们对放大的量子控制的研究中,我们可以轻松地控制最初相关的量子位之间的量子相关程度。我们发现纠缠程度对放大的量子控制没有影响。但是,我们还发现了放大和量子不等式测量之间的明确联系,以及量子位之间的经典相关性。最后,我们建议将放大控制应用于提高量子测量精度,例如与未放大的情况相反,以更精确的方式测量后选控制量子位的相对相位。

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