Quantum Conference Key Agreement with Photon LossQuantum Conference Key Agreement • October 1st, 2020
Conference key agreement (CKA) is an information processing task where more than two parties want to share a common secret key. Here, we present a loss-resilient protocol for CKA, based on redundant encoding and error correction. Our protocol provides a speed-up in transmission rate over the existing lossy CKA protocol. However, encoding and error correction come with extra cost. We show that, using photon sources with creation probability p “ 0.3, our protocol’s secret key rate can overcome the existing protocol’s. Hence, high probability entangled photon sources are required for realistic implementation of our loss-resilient protocol.
Quantum Conference Key Agreement: A ReviewQuantum Conference Key Agreement • October 6th, 2020
Conference key agreement (CKA), or multipartite key distribution, is a cryptographic task where more than two parties wish to establish a common secret key. A composition of bipartite quantum key distribution protocols can accomplish this task. However, the existence of multipartite quantum correlations allows for new and potentially more efficient protocols, to be applied in future quantum networks. Here, we review the existing quantum CKA protocols based on multipartite entanglement, both in the device-dependent and the device-independent scenario.
