Quantum Alice and Silent Bob: Qubit-based Quantum Key Recycling with almost no classical communication
Quantum Physics
2020-03-27 v1
Abstract
We answer an open question about Quantum Key Recycling (QKR): Is it possible to put the message entirely in the qubits without increasing the number of qubits? We show that this is indeed possible. We introduce a prepare-and-measure QKR protocol where the communication from Alice to Bob consists entirely of qubits. As usual, Bob responds with an authenticated one-bit accept/reject classical message. Compared to Quantum Key Distribution (QKD), QKR has reduced round complexity. Compared to previous qubit-wise QKR protocols, our scheme has far less classical communication. We provide a security proof in the universal composability framework and find that the communication rate is asymptotically the same as for QKD with one-way postprocessing.
Cite
@article{arxiv.2003.11799,
title = {Quantum Alice and Silent Bob: Qubit-based Quantum Key Recycling with almost no classical communication},
author = {Daan Leermakers and Boris Skoric},
journal= {arXiv preprint arXiv:2003.11799},
year = {2020}
}