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Optimal and tight Bell inequalities for state-independent contextuality sets
(American Physical Society, 2023)
Two fundamental quantum resources, nonlocality and contextuality, can be connected through Bell inequalities that are violated by state-independent contextuality (SI-C) sets. These Bell inequalities allow for applications ...
Artículo
Minimal true-implies-false and true-implies-true sets of propositions in noncontextual hidden-variable theories
(American Physical Society, 2018)
An essential ingredient in many examples of the conflict between quantum theory and noncontextual hidden variables (e.g., the proof of the Kochen-Specker theorem and Hardy’s proof of Bell’s theorem) is a set of ...
Artículo
Experimental certification of an informationally complete quantum measurement in a device-independent protocol
(Optical Society of America, 2020-02)
Minimal informationally complete positive operator-valued measures (MIC-POVMs) are special kinds of measurement in quantum theory in which the statistics of their d2-outcomes are enough to reconstruct any d-dimensional ...
Artículo
Graph-theoretic approach to Bell experiments with low detection efficiency
(Cornell University, 2023)
Bell inequality tests where the detection efficiency is below a certain threshold ηcrit can be simulated with local hidden-variable models. For the Clauser-Horne-Shimony-Holt Bell inequality and maximally entangled states, ...
Artículo
Kochen-Specker contextuality
(American Physical Society, 2022-12-19)
A central result in the foundations of quantum mechanics is the Kochen-Specker theorem. In short, it states that quantum mechanics is in conflict with classical models in which the result of a measurement does not depend ...
Artículo
Stronger two-observer all-versus-nothing violation of local realism
(American Physical Society, 2005-11-18)
We introduce a two-observer all-versus-nothing proof of Bell’s theorem which reduces the number of required quantum predictions from 9 [A. Cabello, Phys. Rev. Lett. 87, 010403 (2001); Z.-B. Chen et al., Phys. Rev. Lett. ...
Artículo
Thermodynamical cost of some interpretations of quantum theory
(PRA, 2016)
The interpretation of quantum theory is one of the longest-standing debates in physics. Type I interpretations see quantum probabilities as determined by intrinsic properties of the observed system. Type II see them as ...
Artículo
Experimental post-selection loophole-free time-bin and energy-time nonlocality with integrated photonics
(Optica Publishing Group, 2024-04-20)
Time-bin (TB) and energy-time (ET) entanglements are crucial resources for long-distance quantum information processing. However, their standard implementations suffer from the so-called post-selection loophole that allows ...
Artículo
Certifying sets of quantum observables with any full-rank state
(American Physical Society, 2024-04-03)
We show that some sets of quantum observables are unique up to an isometry and have a contextuality witness that attains the same value for any initial state. We prove that these two properties make it possible to certify ...