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

Conference on Lasers and Electro-Optics

Time-frequency multiplexed single-photon source based on LiNbO3 modulators

Marcello Massaro, Vahid Ansari, Fabian Schlue, Kai-Hong Luo, Harald Herrmann, Benjamin Brecht, Christine Silberhorn, Thomas Dirmeier, Christoph Marquardt, Gerd Leuchs

Published Jan 1, 2020• 0 citations
Publisher

Abstract

We present advances in the use of gigahertz LiNbO3 modulators enabling us programmable delays, which we will use to implement a multiplexed single-photon source, based on birefringent phase-matching in KTP waveguides.
DOI
10.1364/cleo_qels.2020.ftu3c.7

Related papers

All-Optical Frequency Multiplexed Single-Photon Source

Chaitali Joshi, Alessandro Farsi, Stéphane Clemmen +2 more

We demonstrate a scalable, low-loss fiber-based frequency multiplexed single-photon source based on efficient parametric frequency conversion. We achieve a record count rate of 4.6 × 104 multiplexed photons with a low (2)(0) of 0.07.

Conference on Lasers and Electro-Optics•Jan 1, 2018•0 citations

An enabling source for quantum sensing and metrology: fiber-based broadband entangled photons

Li Qian

Due to the low birefringence and low differential group delay of the optical fiber, extremely broadband emission of spontaneous parametric downconverted photon pairs can be created in quasi phase-matched thermally-poled optical fibers.

Optica Laser Congress (ASSL, LAC, LS&C)•Jan 1, 2016•0 citations

Tailoring single-photon and multiphoton probabilities of a single-photon on-demand source

Alan L. Migdall, David A. Branning, Stefania Castelletto

As typically implemented, single-photon sources cannot be made to produce single photons with high probability, while simultaneously suppressing the probability of yielding two or more photons. Because of this, single-photon sources cannot really produce single photons on demand. We describe a multiplexed system that allows the probabilities of producing one and more photons to be adjusted independently, enabling a much better approximation of a source of single photons on demand.

arXiv:quant-ph/0205140•Physical Review A•Nov 13, 2002•309 citations

Tunable wavelength conversion of picosecond pulses based on cascaded sum- and difference-frequency generation in quasi-phase-matched LiNbO3 waveguides

Junqiang Sun, Hong Li, Yongshan Cheng +1 more

Optics Communications•Aug 29, 2008•9 citations

On-chip High Spectral Purity and Brightness Idler Single-Photon Source

Zhizhong Yan, Yanmin Duan, L. G. Helt +3 more

Integrated quantum photonic circuits composed of femtosecond laser direct written waveguides (FLDWs) have allowed implementation of several quantum protocols [1], due to their advantages of fast prototyping and ease of 3D fabrication. Adding a single-photon source based on spontaneous four-wave mixing (SFWM) to such circuits on one chip would eliminate coupling loss and promises 3D all-in-one quantum photonic processors. A key issue for such sources is achieving phase-matching in a low index contrast platform. Nevertheless, waveguide form birefringence was recently used to demonstrate this [2]. Here we use a different approach, exploiting stress birefringence introduced with explicit damage structures in the glass [3]. We note that the control of birefringence via stress tracks has great potential for state engineering [4] as the effective nonlinearity can be modulated by adjusting the damage track offset along the propagation direction while keeping the main waveguide optimised for nonlinear interaction.

Conference on Lasers and Electro-Optics•Jun 21, 2015•0 citations

Broadband entangled photon source based on spatial multiplexing of single-pass, type-0 SPDC in bulk crystal

Milan Jana, swagata sarkar, Ayan Nai +1 more

We demonstrate a broadband entangled photon source based on a single-pass, type-0 phase-matched, non-collinear spontaneous parametric down-conversion (SPDC) process. By spatially multiplexing the intrinsically random transverse momentum states of biphotons emitted in an annular spatial distribution from a single-frequency-pumped, 2-mm-long periodically poled KTP crystal, we generate polarization-entangled pair photons with a spectral bandwidth of ∼130 nm centered at 810 nm. The negligible group-velocity mismatch of the co-polarized near-degenerate photons in single-pass and low birefringence of standard optical components preserves indistinguishability across the broadband emission without phase compensation, enabling high-quality polarization entanglement over the entire emission bandwidth. The source achieves a brightness of 0.57 Mpairs/s/mW and a two-photon coherence length of 6.97 μm, while exhibiting an interference visibility exceeding 95%, a Bell–CHSH parameter of 2.526 ± 0.005 that remains stable over 12 h of continuous operation and violates the Bell inequality by more than 100 standard deviations, and a state fidelity of 96.3%. The generic scheme providing the broadest bandwidth entangled biphotons at 810 nm, to our knowledge, can readily be used for other wavelengths as required for multiparty quantum networks and quantum sensing applications.

•Oct 27, 2026•0 citations
Integrated quantum photonic circuits composed of femtosecond laser direct written waveguides (FLDWs) have allowed implementation of several quantum protocols [1], due to their advantages of fast prototyping and ease of 3D fabrication. Adding a single-photon source based on spontaneous four-wave mixing (SFWM) to such circuits on one chip would eliminate coupling loss and promises 3D all-in-one quantum photonic processors. A key issue for such sources is achieving phase-matching in a low index contrast platform. Nevertheless, waveguide form birefringence was recently used to demonstrate this [2]. Here we use a different approach, exploiting stress birefringence introduced with explicit damage structures in the glass [3]. We note that the control of birefringence via stress tracks has great potential for state engineering [4] as the effective nonlinearity can be modulated by adjusting the damage track offset along the propagation direction while keeping the main waveguide optimised for nonlinear interaction.
We demonstrate a broadband entangled photon source based on a single-pass, type-0 phase-matched, non-collinear spontaneous parametric down-conversion (SPDC) process. By spatially multiplexing the intrinsically random transverse momentum states of biphotons emitted in an annular spatial distribution from a single-frequency-pumped, 2-mm-long periodically poled KTP crystal, we generate polarization-entangled pair photons with a spectral bandwidth of ∼130 nm centered at 810 nm. The negligible group-velocity mismatch of the co-polarized near-degenerate photons in single-pass and low birefringence of standard optical components preserves indistinguishability across the broadband emission without phase compensation, enabling high-quality polarization entanglement over the entire emission bandwidth. The source achieves a brightness of 0.57 Mpairs/s/mW and a two-photon coherence length of 6.97 μm, while exhibiting an interference visibility exceeding 95%, a Bell–CHSH parameter of 2.526 ± 0.005 that remains stable over 12 h of continuous operation and violates the Bell inequality by more than 100 standard deviations, and a state fidelity of 96.3%. The generic scheme providing the broadest bandwidth entangled biphotons at 810 nm, to our knowledge, can readily be used for other wavelengths as required for multiparty quantum networks and quantum sensing applications.