49 citations · 293 across the 28 of their papers we have counts for
23 papers · 1 filter
Perfect Games in Dimension-Bounded Communication
Emmanuel Zambrini Cruzeiro
Perfect prepare-and-measure games exhibit an all-or-nothing quantum advantage: a quantum system of dimension satisfies every prescribed winning constraint, whereas a classical…
Daylight quantum keyless private communication for free-space links
Pedro Neto Mendes, Preeti Yadav, Lourenço Sumares +3
Quantum key distribution (QKD) is the most established approach in quantum communication. However, long-distance free-space implementations, particularly satellite links, remain ch…
Bell inequalities from outcome equalities
Ricardo Faleiro, Flavien Hirsch, Emmanuel Zambrini Cruzeiro +1
In this work, we study a particular class of Bell inequalities involving only direct equality-comparisons of outcomes. In the bipartite case, the scenario can be interpreted as a n…
Exploring Bell Nonlocality with Extremal Non-Signaling Boxes
Emmanuel Zambrini Cruzeiro, Junior R. Gonzales-Ureta, Raman Choudhary +3
Extremal non-signaling (ENS) boxes are correlations that correspond to vertices of the non-signaling polytope of a Bell scenario. Neither quantum theory nor any theory for ideal me…
Quantum Keyless Private Communication under intense background noise
Pedro Neto Mendes, Davide Rusca, Hugo Zbinden +1
Quantum key distribution relies on quantum mechanics to securely distribute cryptographic keys, offering security but necessitating complex infrastructure and significant resources…
Non-Interactive Oblivious Transfer and One-Time Programs from Noisy Quantum Storage
Ricardo Faleiro, Manuel Goulão, Leonardo Novo +1
Few primitives are as intertwined with the foundations of cryptography as Oblivious Transfer (OT). Not surprisingly, with the advent of quantum information processing, a major rese…
Multiplexed quantum repeaters with hot multimode alkali-noble gas memories
Alexandre Barbosa, Hugo Terças, Emmanuel Zambrini Cruzeiro
We propose a non-cryogenic optical quantum memory for noble-gas nuclear spins based on the Atomic Frequency Comb (AFC) protocol. Owing to the hours-long coherence lifetimes of the…
Compression of Entanglement Improves Quantum Communication
Yu Guo, Hao Tang, Jef Pauwels +7
Shared entanglement can significantly amplify classical correlations between systems interacting over a limited quantum channel. A natural avenue is to use entanglement of the same…
Quantum-inspired classification based on quantum state discrimination
Emmanuel Zambrini Cruzeiro, Christine De Mol, Serge Massar +1
We present quantum-inspired algorithms for classification tasks inspired by the problem of quantum state discrimination. By construction, these algorithms can perform multiclass cl…
Tight Bell inequalities from polytope slices
José Jesus, Emmanuel Zambrini Cruzeiro
We derive new tight bipartite Bell inequalities for various scenarios. A bipartite Bell scenario is defined by the numbers of settings and outcomes per party, , …
Resource-efficient simulation of noisy quantum circuits and application to network-enabled QRAM optimization
Luís Bugalho, Emmanuel Zambrini Cruzeiro, Kevin C. Chen +3
Giovannetti, Lloyd, and Maccone [Phys. Rev. Lett. 100, 160501] proposed a quantum random access memory (QRAM) architecture to retrieve arbitrary superpositions of (quantum) mem…
Adaptive advantage in entanglement-assisted communications
Jef Pauwels, Stefano Pironio, Emmanuel Zambrini Cruzeiro +1
Entanglement is known to boost the efficiency of classical communication. In distributed computation, for instance, exploiting entanglement can reduce the number of communicated bi…
A coherence-witnessing game and applications to semi-device-independent quantum key distribution
Mário Silva, Ricardo Faleiro, Paulo Mateus +1
Semi-device-independent quantum key distribution aims to achieve a balance between the highest level of security, device independence, and experimental feasibility. Semi-quantum ke…
Bounding and simulating contextual correlations in quantum theory
Armin Tavakoli, Emmanuel Zambrini Cruzeiro, Roope Uola +1
We introduce a hierarchy of semidefinite relaxations of the set of quantum correlations in generalised contextuality scenarios. This constitutes a simple and versatile tool for bou…
Informationally restricted correlations: a general framework for classical and quantum systems
Armin Tavakoli, Emmanuel Zambrini Cruzeiro, Erik Woodhead +1
We introduce new methods and tools to study and characterise classical and quantum correlations emerging from prepare-and-measure experiments with informationally restricted commun…
Blind steering in no-signalling theories
Emmanuel Zambrini Cruzeiro, Nicolas Gisin, Sandu Popescu
Steering is a physical phenomenon which is not restricted to quantum theory, it is also present in more general, no-signalling theories. Here, we study steering from the point of v…
Informationally restricted quantum correlations
Armin Tavakoli, Emmanuel Zambrini Cruzeiro, Jonatan Bohr Brask +2
Quantum communication leads to strong correlations, that can outperform classical ones. Complementary to previous works in this area, we investigate correlations in prepare-and-mea…
Bell inequalities with one bit of communication
E. Zambrini Cruzeiro, N. Gisin
We study Bell scenarios with binary outcomes supplemented by one bit of classical communication. We develop a method to find facet inequalities for such scenarios even when direct…
Complete list of Bell inequalities with four binary settings
E. Zambrini Cruzeiro, N. Gisin
We give the complete list of 175 facet Bell inequalities for the case where Alice and Bob each choose their measurements from a set of four binary outcome measurements. For each in…
Efficient optical pumping using hyperfine levels in Nd:YSiO and its application to optical storage
Emmanuel Zambrini Cruzeiro, Alexey Tiranov, Jonathan Lavoie +4
Efficient optical pumping is an important tool for state initialization in quantum technologies, such as optical quantum memories. In crystals doped with Kramers rare-earth ions, s…
Characterization of the hyperfine interaction of the excited D state of Eu:YSiO
Emmanuel Zambrini Cruzeiro, Jean Etesse, Alexey Tiranov +5
We characterize the Europium (Eu) hyperfine interaction of the excited state (D) and determine its effective spin Hamiltonian parameters for the Zeeman and quadrupol…
Quantification of multidimensional entanglement stored in a crystal
Alexey Tiranov, Sébastien Designolle, Emmanuel Zambrini Cruzeiro +5
The use of multidimensional entanglement opens new perspectives for quantum information processing. However, an important challenge in practice is to certify and characterize multi…
Simple, pulsed, polarisation entangled photon pair source
N. Bruno, E. Zambrini Cruzeiro, A. Martin +1
We report the realisation of a fibred polarisation entangled photon-pair source at 1560 nm based on a type-II non linear interaction and working in the picosecond regime. By taking…