Entanglement Swapping for Generation of Heralded Time-Frequency-Entangled Photon Pairs
Abstract
Photonic time-frequency entanglement is a promising resource for quantum information processing technologies. We investigate swapping of continuous-variable entanglement in the time-frequency degree of freedom using three-wave mixing in the low-gain regime with the aim of producing heralded biphoton states with high purity and low multi-pair probability. Heralding is achieved by combining one photon from each of two biphoton sources via sum-frequency generation to create a herald photon. We present a realistic model with pulsed pumps, investigate the effects of resolving the frequency of the herald photon, and find that frequency-resolving measurement of the herald photon is necessary to produce high-purity biphotons. We also find a trade-off between the rate of successful entanglement swapping and both the purity and quantified entanglement resource (negativity) of the heralded biphoton state.
Keywords
Cite
@article{arxiv.1802.00110,
title = {Entanglement Swapping for Generation of Heralded Time-Frequency-Entangled Photon Pairs},
author = {Dashiell L. P. Vitullo and M. G. Raymer and B. J. Smith and Michał Karpiński and L. Mejling and K. Rottwitt},
journal= {arXiv preprint arXiv:1802.00110},
year = {2018}
}
Comments
17 pages and 9 figures. Version 3 corrects an error in the count rate theory and calculations, fixes a few grammatical and typographical errors, improves formatting, and adds the journal reference