NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Indistinguishable single-mode photons from spectrally engineered biphotons

Published

Author(s)

Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Changchen Chen, Jane Heyes, Kyung-Han Hong, Jeffrey Shapiro, Franco N. Wong

Abstract

We use pulsed spontaneous parametric down-conversion in KTiOPO4, with a Gaussian phasematching 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{+or-}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.
Citation
Optics Express
Volume
27
Pub Type
Journals

Download Paper

https://doi.org/10.1364/OE.27.011626

Keywords

quantum interference, indistinguishable photons, spontaneous parametric downconversion
Optical physics and communications and Quantum information science

Citation

Gerrits, T. , Lita, A. , Nam, S. , Chen, C. , Heyes, J. , Hong, K. , Shapiro, J. and Wong, F. (2019), Indistinguishable single-mode photons from spectrally engineered biphotons, Optics Express, [online], https://doi.org/10.1364/OE.27.011626 (Accessed October 10, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created April 15, 2019, Updated July 9, 2019
Was this page helpful?