Quantum state tomography of a fiber-based source of polarization-entangled photon pairs
Jingyun Fan, M D. Eisaman, Alan L. Migdall
We report an experimental demonstration of a bright highfidelity single-mode-optical-fiber source of polarization-entangled photon pairs. The source takes advantage of single-mode fiber optics, highly nonlinear microstructure fiber, judicious phase-matching, and the inherent stability provided by a Sagnac interferometer. With a modest average pump power (300 μW), we create all four Bell states with a detected two-photon coincidence rate of 7 kHz per bandwidth of 0.9 nm, in a spectral range of more than 20 nm. To characterize the purity of the states produced by this source, we use quantum-state tomography to reconstruct the corresponding density matrices, with fidelities of 95 % or more for each Bell state.
, Eisaman, M.
and Migdall, A.
Quantum state tomography of a fiber-based source of polarization-entangled photon pairs, Optics Express, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=841096
(Accessed June 3, 2023)