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Quantum Cryptography

Quantum cryptography aims to make data secure using fundamental physical principles, such as the quantum mechanical phenomena of entanglement and Heisenberg's uncertainty principle.

Probably its best known application today is quantum key distribution, which allows two parties to protect their secret communication from the prying eyes of an eavesdropper. Quantum key distribution is technologically much easier to implement than a full quantum computer and the first commercial implementations are already available today. Yet many challenges remain in bringing quantum key distribution into practise. For example, recent work by CQT researchers has shown that current practical proposals are plagued by problems that can allow hackers access to the secret communications. By understanding such attacks, one can find new ways to improve practical implementations.

CQT researchers have been and continue to be at the forefront of research in quantum cryptography, from quantum key distribution in 1991 to very active recent research in device independent key distribution, testing the security of practical systems, and two-party protocols such as secure identification.

Theory Group

Valerio Scarani

Experimental Group

Alexander Ling
Christian Kurtsiefer