Truly unentangled photon pairs without spectral filtering

Authors :: Vernon, Z.
Menotti, M.
Tison, C. C.
Steidle, J. A.
Fanto, M. L.
Thomas, P. M.
Preble, S. F.
Smith, A. M.
Alsing, P. M.
Liscidini, M.
Sipe, J. E.
Source :: Optics Letters Vol. 42, Issue 18, pp. 3638-3641 (2017)
Publication Year :: 2017
Abstract: We demonstrate that an integrated silicon microring resonator is capable of efficiently producing photon pairs that are completely unentangled; such pairs are a key component of heralded single photon sources. A dual-channel interferometric coupling scheme can be used to independently tune the quality factors associated with the pump and signal and idler modes, yielding a biphoton wavefunction with Schmidt number arbitrarily close to unity. This will permit the generation of heralded single photon states with unit purity.<br />Comment: 5 pages, 3 figures