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 Technology: Driving Commercialisation of an Enabling Science

BB84 quantum key distribution transmitter utilising broadband sources and a narrow spectral filter

Yoann Noblet, Ross J. Donaldson

Published Jan 11, 2023• 0 citations
Publisher
DOI
10.1117/12.2647391

Related papers

Study on improved implementation of a transmitter in BB84 quantum key distribution system

維楊 張

•Mar 25, 2021•0 citations

Transmitter Design Proposal for the BB84 Quantum Key Distribution Protocol using Polarization Modulated Vertical Cavity Surface-emitting Lasers

Ágoston Schranz, Eszter Udvary

International Conference on Photonics, Optics and Laser Technology•Jan 1, 2018•2 citations

Security of Practical BB84 Quantum Key Distribution

Not Available Not Available

Algorithmica•Nov 7, 2002•3 citations

BB84 quantum key distribution transmitter utilising broadband sources and a narrow spectral filter

Yoann Noblet, Ross J. Donaldson

The secure nature of Quantum Key Distribution (QKD) protocols makes it necessary to ensure that the single photon sources are indistinguishable. Any spectral, temporal or spatial discrepancy between the sources would lead to a breach in the security proofs of the QKD protocols. Traditional, weak-coherent pulse implementations of polarization-based QKD protocols have relied on identical photon sources obtained through tight temperature control and spectral filtering. However, it can be challenging to keep the temperature of the sources stable over time, particularly in a real-world setting, meaning photon sources can become distinguishable. In this work, we present an experimental demonstration of a QKD system capable of achieving spectral indistinguishability, over a 10°C range, using a combination of broadband sources, super-luminescent light emitting diodes (SLEDs), along with a narrow band-pass filter. The temperature stability could be useful in a satellite implementation, where there may be temperature gradients over the payload, particularly on a CubeSat.

Optics Express•Apr 13, 2023•6 citations

Enhancement of Quantum Key Distribution Protocol BB84

Alharith A. Abdullah, Yasser H Jassem

Journal of Computational and Theoretical Nanoscience•Mar 1, 2019•18 citations

A Quantum Key Distribution System for Mobile Platforms With Highly Indistinguishable States

Daniel Sanchez Rosales, Roderick D. Cochran, Samantha D. Isaac +2 more

ABSTRACT Quantum key distribution (QKD) allows two users to exchange a provably secure key for cryptographic applications. In prepare‐and‐measure QKD protocols, the states must be indistinguishable to prevent information leakage to an eavesdropper performing a side‐channel attack. Here, we measure the indistinguishability of quantum states in a prepare‐and‐measure three‐state BB84 polarisation‐based decoy state protocol using resonant‐cavity light‐emitting diodes (RC‐LEDs) as the source in the transmitter. We make the spatial, spectral and temporal DOF of the generated quantum states nearly indistinguishable using a spatial filter single‐mode fibre, a narrow‐band spectral filter and adjustable timing of the electrical pulses driving the RC‐LEDs, respectively. The sources have fully indistinguishable transverse spatial modes. The measured fractional mutual information between an assumed eavesdropper and the legitimate receiver is due to the spectral distinguishability and for the temporal distinguishability. The source is integrated into a full QKD system operating in a laboratory environment, where we achieve a secure key rate of 41.5 kbits/s with an average quantum bit error rate of 2.9%. The low system size, weight and power make it suitable for mobile platforms such as uncrewed aerial vehicles (drones) or automobiles.

arXiv:2411.19880•IET Quantum Communication•Jan 1, 2025•3 citations
The secure nature of Quantum Key Distribution (QKD) protocols makes it necessary to ensure that the single photon sources are indistinguishable. Any spectral, temporal or spatial discrepancy between the sources would lead to a breach in the security proofs of the QKD protocols. Traditional, weak-coherent pulse implementations of polarization-based QKD protocols have relied on identical photon sources obtained through tight temperature control and spectral filtering. However, it can be challenging to keep the temperature of the sources stable over time, particularly in a real-world setting, meaning photon sources can become distinguishable. In this work, we present an experimental demonstration of a QKD system capable of achieving spectral indistinguishability, over a 10°C range, using a combination of broadband sources, super-luminescent light emitting diodes (SLEDs), along with a narrow band-pass filter. The temperature stability could be useful in a satellite implementation, where there may be temperature gradients over the payload, particularly on a CubeSat.
ABSTRACT Quantum key distribution (QKD) allows two users to exchange a provably secure key for cryptographic applications. In prepare‐and‐measure QKD protocols, the states must be indistinguishable to prevent information leakage to an eavesdropper performing a side‐channel attack. Here, we measure the indistinguishability of quantum states in a prepare‐and‐measure three‐state BB84 polarisation‐based decoy state protocol using resonant‐cavity light‐emitting diodes (RC‐LEDs) as the source in the transmitter. We make the spatial, spectral and temporal DOF of the generated quantum states nearly indistinguishable using a spatial filter single‐mode fibre, a narrow‐band spectral filter and adjustable timing of the electrical pulses driving the RC‐LEDs, respectively. The sources have fully indistinguishable transverse spatial modes. The measured fractional mutual information between an assumed eavesdropper and the legitimate receiver is due to the spectral distinguishability and for the temporal distinguishability. The source is integrated into a full QKD system operating in a laboratory environment, where we achieve a secure key rate of 41.5 kbits/s with an average quantum bit error rate of 2.9%. The low system size, weight and power make it suitable for mobile platforms such as uncrewed aerial vehicles (drones) or automobiles.