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arXiv 1709.04513quant-phphysics.optics
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量子增强超纠缠传感

Quantum-Enhanced Sensing from Hyper-Entanglement

S. P. Walborn, A. H. Pimentel, L. Davidovich, R. L. de Matos Filho

摘要:

超纠缠-两个或多个系统的多个自由度之间的同时纠缠-已被用于增强量子信息任务,如量子通信和光子量子计算。在这里,我们表明,超纠缠可以导致增加计量学的量子优势,从纠缠在每个自由度的贡献,允许海森堡标度的参数估计的精度。我们的实验采用光子对纠缠在偏振和空间自由度,以估计一个小的倾斜角的镜子。超过散粒噪声的精度极限通过偏振状态的简单二进制测量而饱和。这里考虑的动力学的广泛有效性意味着基于超纠缠的类似策略可以在各种各样的任务中提供改进。

英文摘要:

Hyperentanglement --- simultaneous entanglement between multiple degrees of freedom of two or more systems --- has been used to enhance quantum information tasks such as quantum communication and photonic quantum computing. Here we show that hyperentanglement can lead to increased quantum advantage in metrology, with contributions from the entanglement in each degree of freedom, allowing for Heisenberg scaling in the precision of parameter estimation. Our experiment employs photon pairs entangled in polarization and spatial degrees of freedom to estimate a small tilt angle of a mirror. Precision limits beyond shot noise are saturated through a simple binary measurement of the polarization state. The broad validity of the dynamics considered here implies that similar strategies based on hyperentanglement can offer improvement in a wide variety of metrological tasks.

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