Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Frontiers in Optics

Generation of ultrashort single photon wavepackets relying on parametric downconversion

Yasser Jerónimo-Moreno, Alfred B. U’Ren

Published Jan 1, 2005• 0 citations
Publisher

Abstract

We discuss the potential of two-photon states generated by parametric downconversion for conditional preparation of single-photon femtosecond duration wavepackets. We present an experimental design which enables the suppression of dispersive temporal broadening.
DOI
10.1364/fio.2005.jtuc43

Related papers

Generation of Pure-State Single-Photon Wavepackets by Conditional Preparation Based on Spontaneous Parametric Downconversion

Alfred B. U’Ren, Christine Silberhorn, Reinhard K. Erdmann +4 more

We study the conditional preparation of single photons based on parametric downconversion, where the detection of one photon from a given pair heralds the existence of a single photon in the conjugate mode. We derive conditions on the modal characteristics of the photon pairs, which ensure that the conditionally prepared single photons are quantum-mechanically pure. We propose specific experimental techniques that yield photon pairs ideally suited for single-photon conditional preparation.

arXiv:quant-ph/0611019•Laser Physics•Nov 2, 2006•62 citations

Conditional preparation of single photon wavepackets in pure quantum states

Peter J. Mosley, Jeff S. Lundeen, Brian J. Smith +4 more

We demonstrate the generation of uncorrelated two-photon states through parametric downconversion with specific source engineering and show how this produces pure heralded single photons. Experimental data showing photons with over 95% purity are presented.

The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting•Jan 1, 2007•0 citations

Conditional Preparation of High-Fidelity Single-Photon Wavepackets

Alfred B. U’Ren

The reliable generation of true single‐photon wavepackets with well‐defined modal structure is a crucial ingredient for the realization of linear optical quantum computing. We have implemented a highly efficient waveguided parametric downconversion source pumped by ultrashort pulses, which is characterized by the spatial decoupling of the signal and idler photon while exhibiting a conditional detection efficiency of 51%, corresponding to a preparation efficiency of 85%. We have performed various tests to confirm the single‐photon character of the conditionally prepared state.

AIP conference proceedings•Jan 1, 2004•0 citations

Conditional preparation of Fourier transform limited single photon wavepackets

Alfred B. U’Ren, José Hipólito García Gracia, Yasser Jerónimo-Moreno

We discuss the relationship between the joint intensity of parametric downconversion photon pairs and certain spectral (temporal) properties of the resulting heralded single photons, including purity and departure from the Fourier transform limit.

Conference on Lasers and Electro-Optics•Jan 1, 2006•0 citations

Characterization of the non-classical nature of conditionally-prepared single photon states

Alfred B. U’Ren, Jonathan L. Ball, Christine Silberhorn +2 more

We report the generation of high-fidelity single photons by conditional preparation from parametric downconversion in a KTP waveguide as experimentally verified by a novel criterion specifically designed for heralded single photon sources.

Frontiers in Optics•Jan 1, 2005•6 citations

Conditional preparation of single photons using parametric downconversion: a recipe for purity

Peter J. Mosley, Jeff S. Lundeen, Brian J. Smith +1 more

In an experiment reported recently (Mosley et al 2008 Phys. Rev. Lett. 100 133601), we demonstrated that, through group velocity matched parametric downconversion, heralded single photons can be generated in pure quantum states without spectral filtering. The technique relies on factorable photon pair production, initially developed theoretically in the strict collinear regime; focusing—required in any experimental implementation—can ruin this factorability. Here, we present the numerical model used to design our single photon sources and minimize spectral correlations in the light of such experimental considerations. Furthermore, we show that the results of our model are in good agreement with measurements made on the photon pairs and give a detailed description of the exact requirements for constructing this type of source.

arXiv:0807.1409•New Journal of Physics•Sep 11, 2008•141 citations
The reliable generation of true single‐photon wavepackets with well‐defined modal structure is a crucial ingredient for the realization of linear optical quantum computing. We have implemented a highly efficient waveguided parametric downconversion source pumped by ultrashort pulses, which is characterized by the spatial decoupling of the signal and idler photon while exhibiting a conditional detection efficiency of 51%, corresponding to a preparation efficiency of 85%. We have performed various tests to confirm the single‐photon character of the conditionally prepared state.
In an experiment reported recently (Mosley et al 2008 Phys. Rev. Lett. 100 133601), we demonstrated that, through group velocity matched parametric downconversion, heralded single photons can be generated in pure quantum states without spectral filtering. The technique relies on factorable photon pair production, initially developed theoretically in the strict collinear regime; focusing—required in any experimental implementation—can ruin this factorability. Here, we present the numerical model used to design our single photon sources and minimize spectral correlations in the light of such experimental considerations. Furthermore, we show that the results of our model are in good agreement with measurements made on the photon pairs and give a detailed description of the exact requirements for constructing this type of source.