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arXiv 0808.0944quant-ph
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利用互无偏基改进量子态估计

Improving Quantum State Estimation with Mutually Unbiased Bases

Robert B. A. Adamson, Aephraim M. Steinberg

摘要:

当用于量子态估计时,在相互无偏基上的投影具有使每次测量的信息提取最大化并使冗余最小化的能力。我们提出了第一个实验演示的量子态层析成像的两个量子比特的偏振态,以利用相互无偏基地。我们证明了改进的状态估计相比,标准的测量策略,并讨论如何可以理解我们使用的测量结构。我们通过实验将我们的方法与三种不同状态的标准状态估计方法进行了比较,并观察到使用我们的技术的不保真度比使用标准状态估计方法低1.84+/-0.06倍。

英文摘要:

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 using our technique than it was using standard state estimation methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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