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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)

We propose an extension of quantum key distribution based on encoding the key into quNits, i.e. quantum states in an N-dimensional Hilbert space. We estimate both the mutual information between the legitimate parties and the eavesdropper, and the error rate, as a function of the dimension of the Hilbert space. We derive the information gained by an… (More)

- Mohamed Bourennane, Manfred Eibl, Sascha Gaertner, Christian Kurtsiefer, Adán Cabello, Harald Weinfurter
- Physical review letters
- 2004

Decoherence-free states protect quantum information from collective noise, the predominant cause of decoherence in current implementations of quantum communication and computation. Here we demonstrate that spontaneous parametric down conversion can be used to generate four-photon states which enable the encoding of one qubit in a decoherence-free subspace.… (More)

- Mohamed Bourennane, Fay Gibson, +5 authors Erland Sundberg
- Optics express
- 1999

An interferometric quantum cryptographic system at 1550nm wavelength using gated InGaAs Avalanche Photo Diodes as single-photon receivers is demonstrated for a transmission distance up to 40 km.

- Manfred Eibl, Sascha Gaertner, Mohamed Bourennane, Christian Kurtsiefer, Marek Zukowski, Harald Weinfurter
- Physical review letters
- 2003

We observe polarization entanglement between four photons produced from a single down-conversion source. The nonclassical correlations between the measurement results violate a generalized Bell inequality for four qubits. The characteristic properties and its easy generation with high interferometric contrast make the observed four-photon state well suited… (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)

- Pavel Trojek, Ch Schmid, Mohamed Bourennane, Harald Weinfurter, Ch Kurtsiefer
- Optics express
- 2004

We present a compact source of polarization-entangled photon pairs at a wavelength of 805 nm using a violet single-mode laser diode as the pump source of type-II spontaneous parametric down-conversion. The source exhibits entanglement and pair-rate comparable to conventional systems utilizing large frame ion lasers thus significantly increases the… (More)

- Armin Tavakoli, Alley Hameedi, Breno Marques, Mohamed Bourennane
- Physical review letters
- 2015

Random access codes (RACs) are used by a party to, with limited communication, access an arbitrary subset of information held by another party. Quantum resources are known to enable RACs that break classical limitations. Here, we study quantum and classical RACs with high-level communication. We derive average performances of classical RACs and present… (More)

- Stefan Gaertner, Ch Kurtsiefer, Mohamed Bourennane, Harald Weinfurter
- Physical review letters
- 2007

Secret sharing is a multiparty cryptographic task in which some secret information is split into several pieces which are distributed among the participants such that only an authorized set of participants can reconstruct the original secret. Similar to quantum key distribution, in quantum secret sharing, the secrecy of the shared information relies not on… (More)

- Mohamed Bourennane, Manfred Eibl, +7 authors Anna Sanpera
- Physical review letters
- 2004

We present the experimental detection of genuine multipartite entanglement using entanglement witness operators. To this aim, we introduce a canonical way of constructing and decomposing witness operators so that they can be directly implemented with present technology. We apply this method to three- and four-qubit entangled states of polarized photons,… (More)