Improving Quantum State Estimation with Mutually Unbiased Bases
Improving Quantum State Estimation with Mutually Unbiased Bases
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DOI：
10.1103/physrevlett.105.030406
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发表时间：
2010-07-16
影响因子：
8.6
通讯作者：
Steinberg, A. M.
中科院分区：
文献类型：
--
作者：
Adamson, R. B. A.;Steinberg, A. M.
当用于量子状态估计时，在相互无偏的基础上的投影具有最大化每次测量的信息提取和最小化冗余的能力。我们首次展示了利用相互无偏的基团对两个量子位偏振态进行量子态层析成像的实验。我们展示了与标准测量策略相比改进的状态估计，并讨论了如何从我们使用的测量结构来理解这一点。我们对三种不同的状态与标准的状态估计方法进行了实验比较，观察到使用我们的方法的保真度比使用标准状态估计方法低1：84+/-0：06倍。
When used in quantum state estimation, projections onto mutually unbiased bases have the ability to maximize information extraction per measurement and to minimize redundancy. We present the first experimental demonstration of quantum state tomography of two-qubit polarization states to take advantage of mutually unbiased bases. We demonstrate improved state estimation as compared to standard measurement strategies and discuss how this can be understood from the structure of the measurements we use. We experimentally compared our method to the standard state estimation method for three different states and observe that the infidelity was up to 1: 84 +/- 0: 06 times lower by using our technique than it was by using standard state estimation methods.