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- Nicolas J Cerf, Mohamed Bourennane, Anders Karlsson, Nicolas Gisin
- Physical review letters
- 2002

We consider two quantum cryptographic schemes relying on encoding the key into qudits, i.e., quantum states in a d-dimensional Hilbert space. The first cryptosystem uses two mutually unbiased bases (thereby extending the BB84 scheme), while the second exploits all d+1 available such bases (extending the six-state protocol for qubits). We derive the… (More)

- Christian Schmid, Pavel Trojek, Mohamed Bourennane, Christian Kurtsiefer, Marek Zukowski, Harald Weinfurter
- Physical review letters
- 2005

We present a simple and practical protocol for the solution of a secure multiparty communication task, the secret sharing, and its proof-of-principle experimental realization. In this protocol, a secret is split among several parties in a way that its reconstruction requires the collaboration of the participating parties. In our scheme the parties solve the… (More)

- Elias Amselem, Lars Eirik Danielsen, Antonio J López-Tarrida, José R Portillo, Mohamed Bourennane, Adán Cabello
- Physical review letters
- 2012

Quantum correlations are contextual yet, in general, nothing prevents the existence of even more contextual correlations. We identify and test a noncontextuality inequality in which the quantum violation cannot be improved by any hypothetical postquantum theory, and use it to experimentally obtain correlations in which the fraction of noncontextual… (More)

- Pavel Trojek, Christian Schmid, Mohamed Bourennane, Caslav Brukner, Marek Zukowski, Harald Weinfurter
- Natural Computing
- 2012

Most proposals for quantum solutions of information-theoretic problems rely on the usage of multi-partite entangled states which are still difficult to produce experimentally with current state-of-the-art technology. Here, we analyze a scheme to simplify a particular kind of multiparty communication protocols for the experiment. We prove that the fidelity… (More)

- Jonathan Jogenfors, Ashraf Mohamed Elhassan, Johan Ahrens, Mohamed Bourennane, Jan-Åke Larsson
- Science advances
- 2015

Photonic systems based on energy-time entanglement have been proposed to test local realism using the Bell inequality. A violation of this inequality normally also certifies security of device-independent quantum key distribution (QKD) so that an attacker cannot eavesdrop or control the system. We show how this security test can be circumvented in… (More)

- Mohamed Nawareg, Sadiq Muhammad, Elias Amselem, Mohamed Bourennane
- Scientific reports
- 2015

Entanglement is one of the most puzzling features of quantum theory and of great importance for the new field of quantum information. The determination whether a given state is entangled or not is one of the most challenging open problems of the field. Here we report on the experimental demonstration of measurement-device-independent (MDI) entanglement… (More)

- Johan Ahrens, Elias Amselem, Adán Cabello, Mohamed Bourennane
- Scientific reports
- 2013

We report two fundamental experiments on three-level quantum systems (qutrits). The first one tests the simplest task for which quantum mechanics provides an advantage with respect to classical physics. The quantum advantage is certified by the violation of Wright's inequality, the simplest classical inequality violated by quantum mechanics. In the second… (More)

- Elias Amselem, Muhammad Sadiq, Mohamed Bourennane
- Scientific reports
- 2013

Understanding the characteristics of a quantum systems when affected by noise is one of the biggest challenges for quantum technologies. The general Pauli error channel is an important lossless channel for quantum communication. In this work we consider the effects of a Pauli channel on a pure four-qubit state and simulate the Pauli channel experimentally… (More)

Quantum mechanics is undoubtedly a weird field of science, which violates many deep conceptual tenets of classical physics, requiring reconsideration of the concepts on which classical physics is based. For instance, it permits persistent correlations between classically separated systems, that are termed as entanglement. To circumvent these problems and… (More)

Secret sharing is a cryptographic primitive which plays a central role in various secure multiparty computation tasks and management of keys in cryptography. In secret sharing protocols, a message is divided into shares given to recipient parties in such a way that some number of parties need to collaborate in order to reconstruct the message. Quantum… (More)