Polarization-entangled photon generation in a standard polarization-maintaining fiber

Virginia O. Lorenz, Bin Fang, Offir Cohen +1 more

Qiang Zhou, Wei Zhang, Tian-zhu Niu +3 more

Bin Fang, Offir Cohen, Jamy B. Moreno +1 more

We demonstrate the generation of polarization-entangled photon pairs in a standard polarization-maintaining fiber using a Sagnac interferometer. This source’s spatial mode is well matched to fiber-based quantum information networks.

M. G. Mingolla, Christian Tomás Schmiegelow, M. A. Larotonda

Bin Fang, Offir Cohen, Jamy B. Moreno +1 more

We investigate state engineering with a standard polarization-maintaining fiber-based photon-pair source, demonstrating the generation of polarization-entangled photons and the ability to tailor spectral entanglement using two distinct pump pulses.

Virginia O. Lorenz, Bin Fang, Offir Cohen

We demonstrate the capability of standard, commercially available polarization-maintaining fibers (PMFs) to generate polarization-entangled photon-pairs by inserting a PMF source into a Sagnac interferometer. We perform a quantum state tomography to reconstruct the density matrix, yielding, without background subtraction or spectral filtering, a polarization-entangled photon-pair state with 92.37 ± 0.14% fidelity to the maximally entangled Bell state. With its high coupling efficiency into SMFs and ability to produce spectrally uncorrelated photons, we expect this source to be useful for free-space and fiber-based quantum information protocols.