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

Frequency-multiplexed high dimensional quantum key distribution via a singly-filtered biphoton frequency comb

Xiang Cheng, Murat Can Sarihan, Kai-Chi Chang, Franco N. C. Wong, Jeffrey H. Shapiro, Chee Wei Wong

Published Jan 1, 2026• 0 citations
Publisher

Abstract

We experimentally demonstrated frequency-multiplexed high-dimensional quantum key distribution based on a singly-filtered biphoton frequency comb, which provided high photon flux surpassing doubly-filtered scheme, and achieved multi-bit encoding across 24 channels.
DOI
10.1364/cleo_fs.2026.fm1a.2

Related papers

High-dimensional Quantum Networks: deploying the frequency and time modalities

Kemal Enes Akyuz, Kai-Chi Chang, Murat Can Sarihan +5 more

Quantum networks enable fundamentally secure communications and entanglement distribution in parallelized quantum computation. Here we describe our high-dimensional quantum network based on frequency-multiplexed time-bin encoding. Our multi-user 21-km experimental testbed is designed for robustness and scalability, with frequency- and temporal-multiplexing for high-rate interconnects while preserving minimal resource usage and multi-party access through simultaneous key or entanglement distribution. Our measurements are in the high-dimensional frequency and temporal conjugate subspaces, via our biphoton frequency comb qudit. Non-local Franson interferometry provide a measured lower-bound of our entanglement-of-formation, and the Schmidt mode decomposition provide an estimate of the accessible quantum information. We highlight adaptive optimization and singly-filtered biphoton combs as a practical architecture in our high-rate quantum network testbed. We describe the photon information efficiency, Shannon capacity, entanglement distribution, raw key rates, security measurements, dispersive bases, code-efficient non-binary error correction, and Holevo bounds embedded in our network.

Quantum Computing, Communication, and Simulation•Mar 5, 2026•0 citations

Frequency-Multiplexed Rate-Adaptive Quantum Key Distribution with High-Dimensional Encoding

Murat Can Sarihan, Kai-Chi Chang, Xiang Cheng +8 more

We offer a photon-efficient QKD protocol based on energy-time entangled biphoton frequency combs that supports multiplexing and rate adaptivity under various channel conditions.

Conference on Lasers and Electro-Optics•Jan 1, 2020•2 citations

Towards high-dimensional frequency-bin quantum key distribution in a multi-user quantum network

Meritxell Cabrejo Ponce, Fabian Steinlechner

We develop methods to harness the high-dimensional entanglement of biphoton quantum frequency combs for frequency-multiplexed, multi-user networks. Using matrix completion techniques and computing asymptotic keys, we investigate the impact of dimension-dependent noise and identify the optimal dimension for encoding quantum information.

•Jan 1, 2026•0 citations

High Dimensional Quantum Key Distribution with Biphoton Frequency Combs through Energy-Time Entanglement

Murat Can Sarihan, Kai-Chi Chang, Xiang Cheng +7 more

Biphoton frequency combs offer a photon-efficient way to achieve a very high-rate quantum key distribution by utilizing both time and frequency-bin encoding, while offering theoretically proven unconditional security.

Conference on Lasers and Electro-Optics•Jan 1, 2019•5 citations

High-dimensional time-frequency entanglement in a singly-filtered biphoton frequency comb

Xiang Cheng, Kai-Chi Chang, Murat Can Sarihan +8 more

Abstract High-dimensional quantum entanglement is a cornerstone for advanced technology enabling large-scale noise-tolerant quantum systems, fault-tolerant quantum computing, and distributed quantum networks. The recently developed biphoton frequency comb (BFC) provides a powerful platform for high-dimensional quantum information processing in its spectral and temporal quantum modes. Here we propose and generate a singly-filtered high-dimensional BFC via spontaneous parametric down-conversion by spectrally shaping only the signal photons with a Fabry-Pérot cavity. High-dimensional energy-time entanglement is verified through Franson-interference recurrences and temporal correlation with low-jitter detectors. Frequency- and temporal- entanglement of our singly-filtered BFC is then quantified by Schmidt mode decomposition. Subsequently, we distribute the high-dimensional singly-filtered BFC state over a 10 km fiber link with a post-distribution time-bin dimension lower bounded to be at least 168. Our demonstrations of high-dimensional entanglement and entanglement distribution show the singly-filtered quantum frequency comb’s capability for high-efficiency quantum information processing and high-capacity quantum networks.

arXiv:2309.05234•Communications Physics•Sep 28, 2023•25 citations

High-dimensional Energy-time Entanglement Distribution via a Biphoton Frequency Comb

Kai-Chi Chang, Xiang Cheng, Murat Can Sarihan +3 more

We report the first high-dimensional energy-time entanglement distribution with a singly-resonant biphoton frequency comb, demonstrating time-frequency Franson interferences with high visibility, and establishing a high-dimensional entanglement link.

Conference on Lasers and Electro-Optics•Jan 1, 2021•7 citations
Quantum networks enable fundamentally secure communications and entanglement distribution in parallelized quantum computation. Here we describe our high-dimensional quantum network based on frequency-multiplexed time-bin encoding. Our multi-user 21-km experimental testbed is designed for robustness and scalability, with frequency- and temporal-multiplexing for high-rate interconnects while preserving minimal resource usage and multi-party access through simultaneous key or entanglement distribution. Our measurements are in the high-dimensional frequency and temporal conjugate subspaces, via our biphoton frequency comb qudit. Non-local Franson interferometry provide a measured lower-bound of our entanglement-of-formation, and the Schmidt mode decomposition provide an estimate of the accessible quantum information. We highlight adaptive optimization and singly-filtered biphoton combs as a practical architecture in our high-rate quantum network testbed. We describe the photon information efficiency, Shannon capacity, entanglement distribution, raw key rates, security measurements, dispersive bases, code-efficient non-binary error correction, and Holevo bounds embedded in our network.
Abstract High-dimensional quantum entanglement is a cornerstone for advanced technology enabling large-scale noise-tolerant quantum systems, fault-tolerant quantum computing, and distributed quantum networks. The recently developed biphoton frequency comb (BFC) provides a powerful platform for high-dimensional quantum information processing in its spectral and temporal quantum modes. Here we propose and generate a singly-filtered high-dimensional BFC via spontaneous parametric down-conversion by spectrally shaping only the signal photons with a Fabry-Pérot cavity. High-dimensional energy-time entanglement is verified through Franson-interference recurrences and temporal correlation with low-jitter detectors. Frequency- and temporal- entanglement of our singly-filtered BFC is then quantified by Schmidt mode decomposition. Subsequently, we distribute the high-dimensional singly-filtered BFC state over a 10 km fiber link with a post-distribution time-bin dimension lower bounded to be at least 168. Our demonstrations of high-dimensional entanglement and entanglement distribution show the singly-filtered quantum frequency comb’s capability for high-efficiency quantum information processing and high-capacity quantum networks.