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- T Lunghi, J Kaniewski, +6 authors H Zbinden
- Physical review letters
- 2013

Bit commitment is a fundamental cryptographic primitive in which Bob wishes to commit a secret bit to Alice. Perfectly secure bit commitment between two mistrustful parties is impossible through asynchronous exchange of quantum information. Perfect security is however possible when Alice and Bob split into several agents exchanging classical and quantum… (More)

- Jedrzej Kaniewski, Marco Tomamichel, Esther Hänggi, Stephanie Wehner
- IEEE Transactions on Information Theory
- 2013

We investigate two-party cryptographic protocols that are secure under assumptions motivated by physics, namely special relativity and quantum mechanics. In particular, we discuss the security of bit commitment in the so-called split models, i.e., models in which at least one of the parties is not allowed to communicate during certain phases of the… (More)

- Jedrzej Kaniewski, Troy Lee, Ronald de Wolf
- ICALP
- 2015

We study the query complexity of computing a function f : {0, 1} n → R + in expectation. This requires the algorithm on input x to output a nonnegative random variable whose expectation equals f (x), using as few queries to the input x as possible. We exactly characterize both the randomized and the quantum query complexity by two polynomial degrees, the… (More)

- Patrick J Coles, Jedrzej Kaniewski, Stephanie Wehner
- Nature communications
- 2014

Interferometers capture a basic mystery of quantum mechanics: a single particle can exhibit wave behaviour, yet that wave behaviour disappears when one tries to determine the particle's path inside the interferometer. This idea has been formulated quantitatively as an inequality, for example, by Englert and Jaeger, Shimony and Vaidman, which upper bounds… (More)

- Marco Tomamichel, Serge Fehr, Jedrzej Kaniewski, Stephanie Wehner
- EUROCRYPT
- 2013

A serious concern with quantum key distribution (QKD) schemes is that, when under attack, the quantum devices in a real-life implementation may behave differently than modeled in the security proof. This can lead to real-life attacks against provably secure QKD schemes. In this work, we show that the standard BB84 QKD scheme is one-sided device-independent.… (More)

- C Pfister, J Kaniewski, +5 authors S Wehner
- Nature communications
- 2016

Quantum mechanics and the theory of gravity are presently not compatible. A particular question is whether gravity causes decoherence. Several models for gravitational decoherence have been proposed, not all of which can be described quantum mechanically. Since quantum mechanics may need to be modified, one may question the use of quantum mechanics as a… (More)

- Patrick Coles, Jedrzej Kaniewski, George Rajna
- 2014

Wehner made the breakthrough while at the Centre for Quantum Technologies at the National University of Singapore. They found that 'wave-particle duality' is simply the quantum 'uncertainty principle' in disguise, reducing two mysteries to one. [4] The accelerating electrons explain not only the Maxwell Equations and the Special Relativity, but the… (More)

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