Linear optics and projective measurements alone suffice to create large-photon-number path entanglement

Details Linear optics and projective measurements alone suffice to create large-photon-number path entanglement Linear optics and projective measurements alone suffice to create large-photon-number path entanglement

2001-09-17

arxiv.org/abs/quant-ph/0109080v2

Phys. Rev. A 65, 030101(R) (2002)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.65.030101

We propose a method for preparing maximal path entanglement with a definite photon number N, larger than two, using projective measurements. In contrast with the previously known schemes, our method uses only linear optics. Specifically, we exhibit a way of generating four-photon, path-entangled states of the form |4,0> + |0,4>, using only four beam splitters and two detectors. These states are of major interest as a resource for quantum interferometric sensors as well as for optical quantum lithography and quantum holography.

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