Precise quantum tomography of photon pairs with entangled orbital angular momentum

Details Precise quantum tomography of photon pairs with entangled orbital angular momentum Precise quantum tomography of photon pairs with entangled orbital angular momentum

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11j3024j&link_type=abstract

New Journal of Physics, Volume 11, Issue 10, pp. 103024 (2009).

Physics

10

Scientific paper

We report a high fidelity tomographic reconstruction of the quantum state of photon pairs generated by parametric down-conversion with orbital angular momentum (OAM) entanglement. Our tomography method allows us to estimate an upper and lower bound for the entanglement between the down-converted photons. We investigate the two-dimensional state subspace defined by the OAM states ±ell and superpositions thereof, with ell=1, 2, ..., 30. We find that the reconstructed density matrix, even for OAMs up to around ell=20, is close to that of a maximally entangled Bell state with a fidelity in the range between F=0.979 and F=0.814. This demonstrates that, although the single count-rate diminishes with increasing ell, entanglement persists in a large dimensional state space.

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