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- T Lunghi, J Kaniewski, +4 authors H Zbinden
- Physical review letters
- 2015

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

- 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)

- Jędrzej Kaniewski
- Physical review letters
- 2016

Self-testing refers to the phenomenon that certain extremal quantum correlations (almost) uniquely identify the quantum system under consideration. For instance, observing the maximal violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality certifies that the two parties share a singlet. While self-testing results are known for several classes of… (More)

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

We study the query complexity of computing a function f : {0, 1} → 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)

- 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)

- 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)

- 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)

- Gerardo Adesso, Thomas R Bromley, +9 authors Patrick J Coles
- 2017

The quantumuncertainty principle famously predicts that there existmeasurements that are inherently incompatible, in the sense that their outcomes cannot be predicted simultaneously. In contrast, no such uncertainty exists in the classical domain, where all uncertainty results from ignorance about the exact state of the physical system.Here, we critically… (More)

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