Open AccessIndistinguishable single-mode photons from spectrally engineered biphotons
Author(s) -
Changchen Chen,
Jane E. Heyes,
Kyung-Han Hong,
Murphy Yuezhen Niu,
Adriana E. Lita,
Thomas Gerrits,
Sae Woo Nam,
Jeffrey H. Shapiro,
Franco N. C. Wong
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.011626
Subject(s) - optics , photon , physics , spontaneous parametric down conversion , interference (communication) , coincidence , quantum optics , gaussian , parametric statistics , quantum key distribution , wigner distribution function , quantum , quantum entanglement , quantum mechanics , telecommunications , computer science , medicine , channel (broadcasting) , statistics , alternative medicine , mathematics , pathology
We use pulsed spontaneous parametric down-conversion in KTiOPO 4 , with a Gaussian phase-matching function and a transform-limited Gaussian pump, to achieve near-unity spectral purity in heralded single photons at telecommunication wavelength. Theory shows that these phase-matching and pump conditions are sufficient to ensure that a biphoton state with a circularly symmetric joint spectral intensity profile is transform limited and factorable. We verify the heralded-state spectral purity in a four-fold coincidence measurement by performing Hong-Ou-Mandel interference between two independently generated heralded photons. With a mild spectral filter we obtain an interference visibility of 98.4±1.1% which corresponds to a heralded-state purity of 99.2%. Our heralded photon source is potentially an essential resource for measurement-based quantum information processing and quantum network applications.