Super-resolving phase measurements with a multi-photon entangled state

Details Super-resolving phase measurements with a multi-photon entangled state Super-resolving phase measurements with a multi-photon entangled state

2003-12-22

arxiv.org/abs/quant-ph/0312186v1

Physics

Quantum Physics

4 pages, 3 figures

Scientific paper

10.1038/nature02493

Using a linear optical elements and post-selection, we construct an entangled
polarization state of three photons in the same spatial mode. This state is
analogous to a ``photon-number path entangled state'' and can be used for
super-resolving interferometry. Measuring a birefringent phase shift, we
demonstrate two- and three-fold improvements in phase resolution.

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