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Quantum cryptography offers a remarkable advantage compared to classical cryptography, because we can prove its security against all possible attacks an adversary can perform. Such proofs are always built on various assumptions, for example on the quantum states and measurements or on the isolation of the laboratories. The validity of the proof depends on the fulfilment of these assumptions, necessitating careful selection. Consequently, device-independent quantum key distribution (QKD) represents the ``holy grail’’ as it requires no assumptions about the quantum devices. Unfortunately, achieving practical implementation of these protocols poses substantial challenges. In this talk, I will delve into the ongoing quest to strike a balance between assumptions and practicality on QKD protocols. Throughout the talk, I will provide a comprehensive overview of QKD, ensuring that all the essential background information is covered.

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Ramona Wolf, ETH Zürich
0.03 THP
Contact: David Gross