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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Information (Quantum Communication and Quantum Repeater) II

Q 48.1: Gruppenbericht

Donnerstag, 12. März 2020, 14:00–14:30, e001

Quantum Readout of Physical Unclonable Keys for Authentication and Authenticated Communication — •Pepijn W. H. Pinkse — University of Twente, Enschede, The Netherlands

Authentication is essential to ensure trust in communication in modern society and will play an even more important role in automated networks. Symmetric authentication schemes rely on a shared secret, which does not scale well with the number of potential communication partners. Asymmetric authentication schemes rely on the combination of a public key and a private key. This scales better with the number of potential partners, but still requires a secret to be kept and stored in a secure way, which could be copied without the owner knowing. This is an important issue even in Quantum Key Distribution schemes that do not provide an intrinsic solution for the authentication of the communication partners.

In the past we have demonstrated the quantum-secure optical readout of a physical unclonable key (PUK) [1]. A PUK is a unique key which cannot be physically copied with existing or foreseeable technology. Recently, we have devised a communication scheme based on optical PUKs employing readout with shaped complex wavefronts of weak coherent light pulses [2].

In this talk I will give an overview of the state of the art, some insights in the hardness of copying and the possibilities to do readout over single-spatial modes.

[1] Goorden et al., Optica 1, 421 (2014). [2] Uppu et al., Quantum Sci. Tech. 4, 04501 (2019).