Efficient source-independent quantum conference key agreementQuantum Conference Key Agreement • June 26th, 2024
Quantum conference key agreement (QCKA) enables the unconditional secure distribution of conference keys among multiple participants. Due to challenges in high-fidelity preparation and long-distance distribution of multi-photon entanglement, entanglement-based QCKA is facing severe limitations in both key rate and scalability. Here, we propose a source-independent QCKA scheme utilizing the post-matching method, feasible within the entangled photon pair distribution network. We introduce an equivalent distributing virtual multi-photon entanglement protocol for providing the unconditional security proof even in the case of coherent attacks. For the symmetry star-network, comparing with previous n-photon entanglement protocol, the conference key rate is improved from O(ηn) to O(η2), where η is the transmittance from the entanglement source to one participant. Simulation results show that the performance of our protocol has multiple orders of magnitude advantages in the intercity distance.
High-Dimensional Quantum Conference Key AgreementQuantum Conference Key Agreement • February 2nd, 2022
Quantum Conference Key Agreement (QCKA) protocols are designed to allow mul- tiple parties to agree on a shared secret key, secure against computationally unbounded adversaries. In this paper, we consider a high-dimensional QCKA protocol and prove its information theoretic security against arbitrary, general, attacks in the finite-key scenario. Our proof technique may be useful for other high-dimensional multi-party quantum cryptographic protocols. Finally, we evaluate the protocol in a variety of settings, showing that high-dimensional states can greatly benefit QCKA protocols.
Fully Passive Quantum Conference Key AgreementQuantum Conference Key Agreement • September 10th, 2024
Here, x and y must be a positive integer that is less than the total slice number M . In this paper, M = 8 and x = y = 2 was used in the simulation shown.
Repeater-Like Asynchronous Measurement-Device-Independent Quantum Conference Key AgreementQuantum Conference Key Agreement • June 25th, 2024
between the users and the port of interference is the same as virtual protocol 1. (iii) The users identify which specific GHZ state was measured according to the click events at each detection port. Steps (iv) and (v) are the same as those in the virtual protocol 1.
Anonymous Conference Key Agreement in Quantum NetworksQuantum Conference Key Agreement • July 17th, 2020
2Electrical Engineering and Computer Science Department, Technische Universita¨t Berlin, 10587 Berlin, Germany 3Institute for Functional Matter and Quantum Technologies, Universita¨t Stuttgart, 70569 Stuttgart, Germany and 4Center for Integrated Quantum Science and Technology (IQST),Universita¨t Stuttgart, 70569 Stuttgart, Germany
