Published in Nature Photonics: Entanglement-enhanced measurement of a completely unknown optical phase

Here we take our knowledge of adaptive quantum control and apply it to enhance phase measurement when we are given a limited set of entangled quantum states. We show the measurement of a completely unknown phase at precision that is in principle below the limit of standard techniques.

G. Y. Xiang, B. L. Higgins, D. W. Berry, H. M. Wiseman, and G. J. Pryde
Nature Photonics 5, 43–7 (2011)

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