aiqbench analysis
This paper addresses a critical vulnerability in quantum key distribution by formalizing transmitter-device-independence using faithful quantum steering and photon storage. The proposed protocol successfully closes the signaling loophole inherent in existing one-sided device-independent frameworks while maintaining strong loss tolerance over 27 km of fiber. These findings represent a significant step toward securing real-world QKD deployments against both measurement-side and transmitter-side attacks without compromising practicality.
Transmitter-device-independent quantum key distribution
arXiv:2604.25225v3 Announce Type: replace Abstract: Transmitter-side device dependence is a longstanding yet implicit problem in quantum key distribution (QKD), in contrast to the thoroughly addressed measurement-side case. Quantum steering, which intrinsically distinguishes the roles of sender and receiver in entanglement certification, offers a natural route to lifting trust assumptions on the transmitter. Existing one-sided device-independent (1sDI) protocols primarily exploit steering as a security resource, and provoke a signaling loophole in the transmitter-receiver architecture. Here we formalize transmitter-device-independence on the basis of faithful quantum steering and propose a transmitter-device-independent (TDI) QKD protocol within 1sDI framework that closes this loophole through introducing a photon storage, thereby eliminating transmitter-side device vulnerabilities. In a proof-of-principle experiment we validate the feasibility of the TDI protocol, achieving a key-rate in the asymptotic limit of 410~bps over 27~km spool fiber. By delivering TDI security while retaining strong loss tolerance, our approach helps bridge the gap between security and practicality for real-world QKD deployments.
Abstract:Transmitter-side device dependence is a longstanding yet implicit problem in quantum key distribution (QKD), in contrast to the thoroughly addressed measurement-side case. Quantum steering, which intrinsically distinguishes the roles of sender and receiver in entanglement certification, offers a natural route to lifting trust assumptions on the transmitter. Existing one-sided device-independent (1sDI) protocols primarily exploit steering as a security resource, and provoke a signaling loophole in the transmitter-receiver architecture. Here we formalize transmitter-device-independence on the basis of faithful quantum steering and propose a transmitter-device-independent (TDI) QKD protocol within 1sDI framework that closes this loophole through introducing a photon storage, thereby eliminating transmitter-side device vulnerabilities. In a proof-of-principle experiment we validate the feasibility of the TDI protocol, achieving a key-rate in the asymptotic limit of 410~bps over 27~km spool fiber. By delivering TDI security while retaining strong loss tolerance, our approach helps bridge the gap between security and practicality for real-world QKD deployments.
14 pages, 9 figures. Comments are welcome!
arXiv:2604.25225 [quant-ph]
(or arXiv:2604.25225v3 [quant-ph] for this version)
Full text under the publisher's open licence · 166 words
Related coverage
Researchers Build First Fully Connected Quantum Network with Microcombs
Quantum Zeitgeist · Aug 3, 2026
Toward Scalable Quantum Networks: An Efficient And Practical Approach to Secure Quantum Conferencing
The Quantum Insider · Sep 22, 2026
Efficient Heralding of Loss-Tolerant Photonic GHZ States for Device-Independent Conference Key Agreement over Long Distances
arXiv · Sep 22, 2026
Researchers Enhance Device-Independent Quantum Key Distribution with Multiple Sources
Quantum Zeitgeist · Jul 16, 2026