Creation of maximally entangled photon number states using optical fibre multiports
Abstract
We theoretically demonstrate a method for producing the maximally path-entangled state (1/Sqrt[2])(|N,0> + exp[iN phi]|0,N>) using intensity-symmetric multiport beamsplitters, single photon inputs and photon-counting postselection, and show that this technique can be used to obtain Heisenberg-limited phase sensitivity for any N and phi. The use of postselection enables successful implementation with non-unit efficiency detectors. We also demonstrate how to make the same state more conveniently by replacing one of the single photon inputs by a coherent state.Keywords
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