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

Quantum Information and Measurement (QIM)

Time/frequency high-dimensional entanglement via engineered parametric downconversion

Francesco Graffitti, Alexander Pickston, Peter Barrow, Massimiliano Proietti, Dmytro O. Kundys, Alessandro Fedrizzi, Agata M. Brańczyk

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We introduce and experimentally benchmark a new scheme for generating frequency-entangled photon pairs in engineered parametric downconversion processes. We discuss how this technique can be used to easily generate high-dimensional entangled bi-photon states.
DOI
10.1364/qim.2019.t5a.15

Related papers

High dimensional frequency-bin entanglement from domain engineered parametric downconversion

Christopher L. Morrison, Francesco Graffitti, Joseph Ho +2 more

We demonstrate the generation of high-dimensional frequency entangled photon pairs using domain engineered parametric down conversion. A natural application of this source would be multi-user quantum key distribution using ITU standard wavelength division multiplexing systems.

Conference on Lasers and Electro-Optics•Jan 1, 2021•1 citation

Time/Frequency High-Dimensional Entanglement via Engineered Parametric Downconversion

Francesco Graffitti, Alexander Pickston, Peter Barrow +4 more

Photonic quantum technologies rely on the deterministic preparation of quantum states encoded in single-photons degrees of freedom. While polarisation, orbital angular momentum and path have been routinely used since the early days of photonic quantum information, the last few years have seen an increasing interest in the frequency-time encoding [1, 2]. Indeed, the possibility of generating high-dimensional states, together with the compatibility of frequency modes and standard optical components, makes the spectral degree of freedom suitable for enhancing the efficiency of quantum protocols, spanning from quantum communication to optical quantum computation.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 1, 2019•0 citations

Towards highly entangled two photon states: observation of ultra-broadband parameteric downconversion

Kevin A. O’Donnell, Alfred B. U’Ren

We demonstrate a parametric downconversion source with an exceptionally large bandwidth (1080nm full-width half-maximum about the 1885nm degenerate wavelength), as a step towards the generation of photon pairs with high dimensional entanglement.

International Conference on Quantum Information•Jan 1, 2007•0 citations

Hyper-entanglement between pulse modes and frequency bins

Fabrizio Chiriano, Joseph Ho, Christopher L. Morrison +4 more

Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols by allowing each DOF to perform the task it is optimally suited for. Here we demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins. The pulse modes are generated via parametric downconversion in a domain-engineered crystal and subsequently entangled to two frequency bins via a spectral mapping technique. The resulting hyper-entangled state is characterized and verified via measurement of its joint spectral intensity and non-classical two-photon interference patterns from which we infer its spectral phase. The protocol combines the robustness to loss, intrinsic high dimensionality and compatibility with standard fiber-optic networks of the energy-time DOF with the ability of hyper-entanglement to increase the capacity and efficiency of the quantum channel, already exploited in recent experimental applications in both quantum information and quantum computation.

arXiv:2304.12195•Optics Express•Sep 25, 2023•11 citations

Simple method of generating and distributing frequency-entangled qudits

Rui-Bo Jin, Ryosuke Shimizu, Mikio Fujiwara +7 more

High-dimensional, frequency-entangled photonic quantum bits (qudits for d -dimension) are promising resources for quantum information processing in an optical fiber network and can also be used to improve channel capacity and security for quantum communication. However, up to now, it is still challenging to prepare high-dimensional frequency-entangled qudits in experiments, due to technical limitations. Here we propose and experimentally implement a novel method for a simple generation of frequency-entangled qudts with without the use of any spectral filters or cavities. The generated state is distributed over 15 km in total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. Our frequency-entangled qudits will enable quantum cryptographic experiments with enhanced performances. This distribution of distinct entangled frequency modes may also be useful for improved metrology, quantum remote synchronization, as well as for fundamental test of stronger violation of local realism.

arXiv:1603.07887•Quantum Science and Technology•Nov 1, 2016•61 citations

Engineering a Factorable Photon Pair Source

Kevin Zielnicki, Paul G. Kwiat

Spontaneous parametric downconversion is an important process for providing pairs of photons for quantum optics. We discuss a scheme for eliminating undesired inter-photon correlations inherent in this process, and several methods of characterizing these correlations [1].

Frontiers in Optics•Jan 1, 2013•0 citations
Photonic quantum technologies rely on the deterministic preparation of quantum states encoded in single-photons degrees of freedom. While polarisation, orbital angular momentum and path have been routinely used since the early days of photonic quantum information, the last few years have seen an increasing interest in the frequency-time encoding [1, 2]. Indeed, the possibility of generating high-dimensional states, together with the compatibility of frequency modes and standard optical components, makes the spectral degree of freedom suitable for enhancing the efficiency of quantum protocols, spanning from quantum communication to optical quantum computation.
Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols by allowing each DOF to perform the task it is optimally suited for. Here we demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins. The pulse modes are generated via parametric downconversion in a domain-engineered crystal and subsequently entangled to two frequency bins via a spectral mapping technique. The resulting hyper-entangled state is characterized and verified via measurement of its joint spectral intensity and non-classical two-photon interference patterns from which we infer its spectral phase. The protocol combines the robustness to loss, intrinsic high dimensionality and compatibility with standard fiber-optic networks of the energy-time DOF with the ability of hyper-entanglement to increase the capacity and efficiency of the quantum channel, already exploited in recent experimental applications in both quantum information and quantum computation.
High-dimensional, frequency-entangled photonic quantum bits (qudits for d -dimension) are promising resources for quantum information processing in an optical fiber network and can also be used to improve channel capacity and security for quantum communication. However, up to now, it is still challenging to prepare high-dimensional frequency-entangled qudits in experiments, due to technical limitations. Here we propose and experimentally implement a novel method for a simple generation of frequency-entangled qudts with without the use of any spectral filters or cavities. The generated state is distributed over 15 km in total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. Our frequency-entangled qudits will enable quantum cryptographic experiments with enhanced performances. This distribution of distinct entangled frequency modes may also be useful for improved metrology, quantum remote synchronization, as well as for fundamental test of stronger violation of local realism.