Experimental certification of contextuality, coherence, and dimension in a programmable universal photonic processor

T Giordani, R Wagner, C Esposito, A Camillini… - Science …, 2023 - science.org
Quantum superposition of high-dimensional states enables both computational speed-up
and security in cryptographic protocols. However, the exponential complexity of tomographic …

Properties and Applications of the Kirkwood-Dirac Distribution

DRM Arvidsson-Shukur, WF Braasch Jr… - arXiv preprint arXiv …, 2024 - arxiv.org
The most famous quasi-probability distribution, the Wigner function, has played a pivotal role
in the development of a continuous-variable quantum theory that has clear analogues of …

Aspects of the phenomenology of interference that are genuinely nonclassical

L Catani, M Leifer, G Scala, D Schmid, RW Spekkens - Physical Review A, 2023 - APS
Interference phenomena are often claimed to resist classical explanation. However, such
claims are undermined by the fact that the specific aspects of the phenomenology upon …

What is nonclassical about uncertainty relations?

L Catani, M Leifer, G Scala, D Schmid, RW Spekkens - Physical Review Letters, 2022 - APS
Uncertainty relations express limits on the extent to which the outcomes of distinct
measurements on a single state can be made jointly predictable. The existence of nontrivial …

Linear program for testing nonclassicality and an open-source implementation

JH Selby, E Wolfe, D Schmid, AB Sainz, VP Rossi - Physical Review Letters, 2024 - APS
A well-motivated method for demonstrating that an experiment resists any classical
explanation is to show that its statistics violate generalized noncontextuality. We here …

Coherence and contextuality in a Mach-Zehnder interferometer

R Wagner, A Camillini, EF Galvão - Quantum, 2024 - quantum-journal.org
We analyse nonclassical resources in interference phenomena using generalized
noncontextuality inequalities and basis-independent coherence witnesses. We use recently …

Contextuality with vanishing coherence and maximal robustness to dephasing

VP Rossi, D Schmid, JH Selby, AB Sainz - Physical Review A, 2023 - APS
Generalized contextuality is a resource for a wide range of communication and information
processing protocols. However, contextuality is not possible without coherence, and so can …

Quantum vs noncontextual semi-device-independent randomness certification

C Roch i Carceller, K Flatt, H Lee, J Bae, JB Brask - Physical Review Letters, 2022 - APS
We compare the power of quantum and classical physics in terms of randomness
certification from devices which are only partially characterized. We study randomness …

Alternative robust ways of witnessing nonclassicality in the simplest scenario

M Khoshbin, L Catani, M Leifer - Physical Review A, 2024 - APS
In this paper we relate notions of nonclassicality in what is known as the simplest nontrivial
scenario (a prepare and measure scenario composed of four preparations and two binary …

Kirkwood-Dirac representations beyond quantum states and their relation to noncontextuality

D Schmid, RD Baldijão, Y Yīng, R Wagner, JH Selby - Physical Review A, 2024 - APS
Kirkwood-Dirac representations of quantum states are increasingly finding use in many
areas within quantum theory. Usually, representations of this sort are only applied to provide …