Centre for Quantum Information Quantum Control and Institute for Optical Sciences, Department of Physics,60 St. George Street, University of Toronto, Toronto, Ontario, Canada, M5S 1A7.
Phys Rev Lett. 2010 Jul 16;105(3):030406. doi: 10.1103/PhysRevLett.105.030406.
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.
当用于量子态估计时，投影到相互无偏基上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基进行两量子比特极化态量子态层析的实验演示。与标准测量策略相比，我们证明了改进的状态估计，并讨论了如何从我们使用的测量结构来理解这一点。我们实验比较了我们的方法和三种不同状态的标准状态估计方法，观察到使用我们的技术比使用标准状态估计方法的失效率低 1.84 ± 0.06 倍。
