155 citations · 1.4k across the 23 of their papers we have counts for
23 papers
A mathematical foundation for self-testing: Lifting common assumptions
Pedro Baptista, Ranyiliu Chen, Jędrzej Kaniewski +4
In this work we study the phenomenon of self-testing from the first principles, aiming to place this versatile concept on a rigorous mathematical footing. Self-testing allows a cla…
Mutually Unbiased Measurements, Hadamard Matrices, and Superdense Coding
Máté Farkas, Jędrzej Kaniewski, Ashwin Nayak
Mutually unbiased bases (MUBs) are highly symmetric bases on complex Hilbert spaces, and the corresponding rank-1 projective measurements are ubiquitous in quantum information theo…
Quantifying incompatibility of quantum measurements through non-commutativity
Krzysztof Mordasewicz, Jędrzej Kaniewski
The existence of incompatible measurements, i.e. measurements which cannot be performed simultaneously on a single copy of a quantum state, constitutes an important distinction bet…
Near-maximal two-photon entanglement for quantum communications at 2.1 m
Adetunmise C. Dada, Jędrzej Kaniewski, Corin Gawith +4
Owing to a reduced solar background and low propagation losses in the atmosphere, the 2- to 2.5-m waveband is a promising candidate for daylight quantum communication. This spec…
Incompatibility robustness of quantum measurements: a unified framework
Sébastien Designolle, Máté Farkas, Jędrzej Kaniewski
In quantum mechanics performing a measurement is an invasive process which generally disturbs the system. Due to this phenomenon, there exist incompatible quantum measurements, i.e…
Maximal randomness from partially entangled states
Erik Woodhead, Jędrzej Kaniewski, Boris Bourdoncle +4
We investigate how much randomness can be extracted from a generic partially entangled pure state of two qubits in a device-independent setting, where a Bell test is used to certif…
Self-testing entangled measurements in quantum networks
Marc-Olivier Renou, Jędrzej Kaniewski, Nicolas Brunner
Self-testing refers to the possibility of characterizing an unknown quantum device based only on the observed statistics. Here we develop methods for self-testing entangled quantum…
Maximal nonlocality from maximal entanglement and mutually unbiased bases, and self-testing of two-qutrit quantum systems
Jędrzej Kaniewski, Ivan Šupić, Jordi Tura +3
Bell inequalities are an important tool in device-independent quantum information processing because their violation can serve as a certificate of relevant quantum properties. Prob…
Self-testing quantum states and measurements in the prepare-and-measure scenario
Armin Tavakoli, Jędrzej Kaniewski, Tamás Vértesi +2
The goal of self-testing is to characterize an a priori unknown quantum system based solely on measurement statistics, i.e. using an uncharacterized measurement device. Here we dev…
Geometry of the set of quantum correlations
Koon Tong Goh, Jędrzej Kaniewski, Elie Wolfe +5
It is well known that correlations predicted by quantum mechanics cannot be explained by any classical (local-realistic) theory. The relative strength of quantum and classical corr…
Self-testing of binary observables based on commutation
Jędrzej Kaniewski
We consider the problem of certifying binary observables based on a Bell inequality violation alone, a task known as self-testing of measurements. We introduce a family of commutat…
Device-independence for two-party cryptography and position verification
Jeremy Ribeiro, Le Phuc Thinh, Jedrzej Kaniewski +2
Quantum communication has demonstrated its usefulness for quantum cryptography far beyond quantum key distribution. One domain is two-party cryptography, whose goal is to allow two…
Quantum preparation uncertainty and lack of information
Filip Rozpędek, Jędrzej Kaniewski, Patrick J. Coles +1
The quantum uncertainty principle famously predicts that there exist measurements that are inherently incompatible, in the sense that their outcomes cannot be predicted simultaneou…
Analytic and nearly optimal self-testing bounds for the Clauser-Horne-Shimony-Holt and Mermin inequalities
Jędrzej Kaniewski
Self-testing refers to the phenomenon that certain extremal quantum correlations (almost) uniquely identify the quantum system under consideration. For instance observing the maxim…
Device-independent two-party cryptography secure against sequential attacks
Jędrzej Kaniewski, Stephanie Wehner
The goal of two-party cryptography is to enable two parties, Alice and Bob, to solve common tasks without the need for mutual trust. Examples of such tasks are private access to a…
Relativistic quantum cryptography
Jędrzej Kaniewski
In this thesis we explore the benefits of relativistic constraints for cryptography. We first revisit non-communicating models and its applications in the context of interactive pr…
Understanding nature from experimental observations: a theory independent test for gravitational decoherence
C. Pfister, J. Kaniewski, M. Tomamichel +5
Quantum mechanics and the theory of gravity are presently not compatible. A particular question is whether gravity causes decoherence - an unavoidable source of noise. Several mode…
Query complexity in expectation
Jedrzej Kaniewski, Troy Lee, Ronald de Wolf
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 expectati…
Practical relativistic bit commitment
Tommaso Lunghi, Jędrzej Kaniewski, Felix Bussieres +4
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 impo…
Equivalence of wave-particle duality to entropic uncertainty
Patrick J. Coles, Jędrzej Kaniewski, Stephanie Wehner
Interferometers capture a basic mystery of quantum mechanics: a single particle can exhibit wave behavior, yet that wave behavior disappears when one tries to determine the particl…
Entropic uncertainty from effective anti-commutators
Jędrzej Kaniewski, Marco Tomamichel, Stephanie Wehner
We investigate entropic uncertainty relations for two or more binary measurements, for example spin- or polarisation measurements. We argue that the effective anti-com…
Experimental bit commitment based on quantum communication and special relativity
T. Lunghi, J. Kaniewski, F. Bussieres +6
Bit commitment is a fundamental cryptographic primitive in which Bob wishes to commit a secret bit to Alice. Perfectly secure bit commitment has been proven impossible through asyn…
A Monogamy-of-Entanglement Game With Applications to Device-Independent Quantum Cryptography
Marco Tomamichel, Serge Fehr, Jędrzej Kaniewski +1
We consider a game in which two separate laboratories collaborate to prepare a quantum system and are then asked to guess the outcome of a measurement performed by a third party in…