Search Results for author: Rafael Chaves

Found 12 papers, 3 papers with code

Quantum Finance: a tutorial on quantum computing applied to the financial market

no code implementations8 Aug 2022 Askery Canabarro, Taysa M. Mendonça, Ranieri Nery, George Moreno, Anton S. Albino, Gleydson F. de Jesus, Rafael Chaves

Previously only considered a frontier area of Physics, nowadays quantum computing is one of the fastest growing research field, precisely because of its technological applications in optimization problems, machine learning, information security and simulations.

Portfolio Optimization

Causal inference with imperfect instrumental variables

no code implementations4 Nov 2021 Nikolai Miklin, Mariami Gachechiladze, George Moreno, Rafael Chaves

However, if this independence condition is not met, can we still work with imperfect instrumental variables?

Causal Inference valid

Ab-initio experimental violation of Bell inequalities

no code implementations2 Aug 2021 Davide Poderini, Emanuele Polino, Giovanni Rodari, Alessia Suprano, Rafael Chaves, Fabio Sciarrino

The violation of a Bell inequality is the paradigmatic example of device-independent quantum information: the nonclassicality of the data is certified without the knowledge of the functioning of devices.

Semi-device-independent certification of entanglement in superdense coding

no code implementations4 Feb 2021 George Moreno, Ranieri Nery, Carlos de Gois, Rafael Rabelo, Rafael Chaves

Superdense coding is a paradigmatic protocol in quantum information science, employing a quantum communication channel to send classical information more efficiently.

Quantum Physics

Quantifying causal influences in the presence of a quantum common cause

no code implementations2 Jul 2020 Mariami Gachechiladze, Nikolai Miklin, Rafael Chaves

Quantum mechanics challenges our intuition on the cause-effect relations in nature.

Device-Independent Secret Sharing and a Stronger Form of Bell Nonlocality

1 code implementation25 Sep 2019 M. G. M. Moreno, Samuraí Brito, Ranieri V. Nery, Rafael Chaves

Bell nonlocality, the fact that local hidden variable models cannot reproduce the correlations obtained by measurements on entangled states, is a cornerstone in our modern understanding of quantum theory.

Quantum Physics

Bounding the sets of classical and quantum correlations in networks

1 code implementation18 Apr 2019 Alejandro Pozas-Kerstjens, Rafael Rabelo, Łukasz Rudnicki, Rafael Chaves, Daniel Cavalcanti, Miguel Navascues, Antonio Acín

We present a method that allows the study of classical and quantum correlations in networks with causally-independent parties, such as the scenario underlying entanglement swapping.

Quantum Physics

Machine learning non-local correlations

no code implementations21 Aug 2018 Askery Canabarro, Samuraí Brito, Rafael Chaves

The ability to witness non-local correlations lies at the core of foundational aspects of quantum mechanics and its application in the processing of information.

BIG-bench Machine Learning

Semidefinite tests for latent causal structures

no code implementations3 Jan 2017 Aditya Kela, Kai von Prillwitz, Johan Aberg, Rafael Chaves, David Gross

Testing whether a probability distribution is compatible with a given Bayesian network is a fundamental task in the field of causal inference, where Bayesian networks model causal relations.

Causal Inference

A unifying framework for relaxations of the causal assumptions in Bell's theorem

no code implementations17 Nov 2014 Rafael Chaves, Richard Kueng, Jonatan Bohr Brask, David Gross

Bell's Theorem shows that quantum mechanical correlations can violate the constraints that the causal structure of certain experiments impose on any classical explanation.

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