Direct state measurements under state-preparation-and-measurement errors
Direct state measurements under state-preparation-and-measurement errors
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DOI：
10.1007/s11128-021-03144-7
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发表时间：
2020-07
影响因子：
2.5
通讯作者：
Kieu Quang Tuan;Hung Q. Nguyen;Le Bin Ho
中科院分区：
文献类型：
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作者：
Kieu Quang Tuan;Hung Q. Nguyen;Le Bin Ho
直接态测量（DSM）是一种允许直接检索量子态波函数的层析方法。然而，当前DSM研究的一个缺点是它不提供对噪声量子系统的访问。在这里，我们试图通过研究经历状态准备和测量（SPAM）误差的DSM测量精度来填补这一空白。我们操纵了一个量子控制的测量框架，并比较了它们之间的效率。在这种SPAM误差下，待测状态与真实状态有轻微偏差，后选过程中的测量误差导致层析成像精度降低。我们的研究可以为SPAM错误断层扫描提供可靠的工具，并有助于理解和解决当前量子技术的迫切需求。
Direct state measurement (DSM) is a tomography method that allows for retrieving quantum states’ wave functions directly. However, a shortcoming of current studies on the DSM is that it does not provide access to noisy quantum systems. Here, we attempt to fill the gap by investigating the DSM measurement precision that undergoes the state-preparation-and-measurement (SPAM) errors. We manipulate a quantum controlled measurement framework with various configurations and compare the efficiency between them. Under such SPAM errors, the state to be measured lightly deviates from the true state, and the measurement error in the postselection process results in less accurate in the tomography. Our study could provide a reliable tool for SPAM errors tomography and contribute to understanding and resolving an urgent demand for current quantum technologies.