Towards Heisenberg Limit in Magnetometry with Parametric Down Converted Photons

Details Towards Heisenberg Limit in Magnetometry with Parametric Down Converted Photons Towards Heisenberg Limit in Magnetometry with Parametric Down Converted Photons

2006-04-28

arxiv.org/abs/quant-ph/0605002v1

Phys. Rev. A 74, 053810 (2006)

Physics

Quantum Physics

4.2 pages, 6 figures

Scientific paper

10.1103/PhysRevA.74.053810

Recent theoretical and experimental papers have shown how one can achieve Heisenberg limited measurements by using entangled photons. Here we show how the photons in non-collinear down conversion process can be used for improving the sensitivity of magneto-optical rotation by a factor of four which takes us towards the Heisenberg limit. Our results apply to sources with arbitrary pumping. We also present several generalizations of earlier results for the collinear geometry. The sensitivity depends on whether the two-photon or four-photon coincidence detection is used.

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