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Seminar Announcement Date: Wednesday, 4 December 2024 Time: 11:30 AM Venue: Lecture Hall 202 Efficient Fully One-Way Quantum Key Distribution in the Bounded Storage Model Sayantan Chakraborty NUS. 04-12-24 Abstract Quantum Key Distribution (QKD) is one of the most important applications of quantum information science, in that it achieves the task of distributing statistically secure private keys, even in the presence of an arbitrarily powerful adversary. Additionally, practical QKD protocols like BB84 require the parties to have only very basic, and currently feasible, quantum hardware, and do not assume that the parties can store qubits indefinitely or have access to a fully functional quantum computer. However, all known QKD protocols seem to fall into 2 categories: either they require 2 way communication or they require the parties to be able to store qubits indefinitely with good fidelity. This raises the question whether there exist QKD protocols which can be realised with solely one way communication and without the use of quantum memory devices. In this work, we answer this question in the affirmative, albeit in the bounded storage model. We demonstrate the first QKD protocol, which requires solely one-way communication, and also requires the parties to only have the capability to implement single qubit measurements and Hadamard gates, capabilities which are well within the bounds of current technology. Our protocol is based on the information locking protocol of Fawzi, Hayden and Sen, Along the way, we also introduce a new \emph{efficient} information reconciliation scheme which is secure against \emph{worst case} errors which can be introduced by the adversary, along with having an optimal rate-distance tradeoff for any such scheme. To the best of our knowledge, most other such schemes available in the literature with comparable performance are shown to be secure under much more restrictive assumptions.
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