Results 21 to 30 of about 4,670 (139)
Correlations in Entanglement-Assisted Prepare-and-Measure Scenarios
PRX Quantum, 2021 We investigate the correlations that can arise between Alice and Bob in prepare-and-measure communication scenarios where the source (Alice) and the measurement device (Bob) can share prior entanglement. The paradigmatic example of such a scenario is the
Armin Tavakoli +3 more
doaj +1 more source
Gadget structures in proofs of the Kochen-Specker theorem [PDF]
Quantum, 2020 The Kochen-Specker theorem is a fundamental result in quantum foundations that has spawned massive interest since its inception. We show that within every Kochen-Specker graph, there exist interesting subgraphs which we term $01$-gadgets, that capture ...
Ravishankar Ramanathan +5 more
doaj +1 more source
Necessary detection efficiencies for secure quantum key distribution and bound randomness [PDF]
, 2016 In recent years, several hacking attacks have broken the security of quantum cryptography implementations by exploiting the presence of losses and the ability of the eavesdropper to tune detection efficiencies.
Acín, Antonio +4 more
core +3 more sources
Entanglement in prepare-and-measure scenarios: many questions, a few answers
New Journal of Physics, 2022 Entanglement and quantum communication are paradigmatic resources in quantum information science leading to correlations between systems that have no classical analogue.
Jef Pauwels +3 more
doaj +1 more source
Quantifying multipartite nonlocality via the size of the resource [PDF]
, 2014 The generation of (Bell-)nonlocal correlations, i.e., correlations leading to the violation of a Bell-like inequality, requires the usage of a nonlocal resource, such as an entangled state.
Curchod, Florian John +2 more
core +3 more sources
Information capacity of quantum communication under natural physical assumptions [PDF]
QuantumThe quantum prepare-and-measure scenario has been studied under various physical assumptions on the emitted states. Here, we first discuss how different assumptions are conceptually and formally related.
Jef Pauwels +2 more
doaj +1 more source
The local content of all pure two-qubit states [PDF]
, 2012 The (non-)local content in the sense of Elitzur, Popescu, and Rohrlich (EPR2) [Phys. Lett. A 162, 25 (1992)] is a natural measure for the (non-)locality of quantum states. Its computation is in general difficult, even in low dimensions, and is one of the
A. Méthot +12 more
core +3 more sources
A histories perspective on characterizing quantum non-locality
New Journal of Physics, 2014 We introduce a framework for studying non-locality and contextuality inspired by the path integral formulation of quantum theory. We prove that the existence of a strongly positive joint quantum measure—the quantum analogue of a joint probability measure—
Fay Dowker, Joe Henson, Petros Wallden
doaj +1 more source
Maximal randomness from partially-entangled states
, 2020 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 certify the correct functioning of the apparatus.
Acín, Antonio +6 more
core +1 more source
Popescu-Rohrlich correlations as a unit of nonlocality [PDF]
, 2005 A set of nonlocal correlations that have come to be known as a PR box suggest themselves as a natural unit of nonlocality, much as a singlet is a natural unit of entanglement. We present two results relevant to this idea.
Barrett, Jonathan, Pironio, Stefano
core +2 more sources