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ArXiv identifier: 



Christoffer Wittmann


C. Wiechers, L. Lydersen, C. Wittmann, D. Elser, J. Skaar, C. Marquardt, V. Makarov, and G. Leuchs

We present a method to control the detection events in quantum key distribution systems that use gated single-photon detectors. We employ bright pulses as faked states, timed to arrive at the avalanche photodiodes outside the activation time. The attack can remain unnoticed, since the faked states do not increase the error rate per se. This allows for an intercept–resend attack, where an eavesdropper transfers her detection events to the legitimate receiver without causing any errors.

The electronic chips of the future might not be made of silicon or even graphene but of a material called molybdenite (MoS2). EU-funded research presented in the journal Nature Nanotechnology demonstrates that molybdenite is a highly effective semi-conductor that could be used to make transistors both smaller and more energy efficient.

PhD project in quantum information and the foundations of quantum theory.

A fully funded PhD position is available for a UK/EU student, project title "Quantum theory and the nature of time". This position is partially supported by a large grant from the Foundational Questions Institute. The aim is to investigate the connections between the mathematical formalism of quantum theory and facts about time, such as reversibility and irreversibility of physical laws. For more details, including an introduction and technical abstract, see here:

The purpose of this conference is to provide a technical forum for discussions in the latest developments in quantum-physics-based information security. Traditional approaches to information security rely on mathematical relationships associated with encryption keys and encryption algorithms to achieve practical security. Quantum computing is considered to be an emerging threat to these classical techniques.


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