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

@article{Jack+:NJP11:2009, abstract = {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 +- and superpositions thereof, with =1, 2, ..., 30. We find that the reconstructed density matrix, even for OAMs up to around =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 , entanglement persists in a large dimensional state space.}, author = {Jack, B. and Leach, J. and Ritsch, H. and Barnett, S. M. and Padgett, M. J. and Franke-Arnold, S.}, booktitle = {New Journal of Physics}, citeulike-article-id = {5931108}, citeulike-linkout-0 = {http://dx.doi.org/10.1088/1367-2630/11/10/103024}, doi = {10.1088/1367-2630/11/10/103024}, issn = {1367-2630}, journal = {New Journal of Physics}, keywords = {angular, entanglement, momentum, orbital, quantum}, month = {October}, number = {10}, pages = {103024+}, posted-at = {2009-10-26 17:15:35}, priority = {2}, publisher = {IOP Publishing}, title = {Precise quantum tomography of photon pairs with entangled orbital angular momentum}, url = {http://dx.doi.org/10.1088/1367-2630/11/10/103024}, volume = {11}, year = {2009} }

TY - JOUR ID - Jack+:NJP11:2009 L3 - citeulike-article-id:5931108 N2 - 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 +- and superpositions thereof, with =1, 2, ..., 30. We find that the reconstructed density matrix, even for OAMs up to around =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 , entanglement persists in a large dimensional state space. IS - 10 JF - New Journal of Physics SN - 1367-2630 TI - Precise quantum tomography of photon pairs with entangled orbital angular momentum PB - IOP Publishing VL - 11 T2 - New Journal of Physics SP - 103024 KW - angular KW - entanglement KW - momentum KW - orbital KW - quantum AU - Jack, B AU - Leach, J AU - Ritsch, H AU - Barnett, SM AU - Padgett, MJ AU - Franke-Arnold, S PY - 2009/10// UR - http://dx.doi.org/10.1088/1367-2630/11/10/103024 ER -