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- F M Paula, I A Silva, +8 authors M S Sarandy
- Physical review letters
- 2013

Correlations in quantum systems exhibit a rich phenomenology under the effect of various sources of noise. We investigate theoretically and experimentally the dynamics of quantum correlations and their classical counterparts in two nuclear magnetic resonance setups, as measured by geometric quantifiers based on trace norm. We consider two-qubit systems… (More)

- R Auccaise, L C Céleri, +7 authors R M Serra
- Physical review letters
- 2011

Nonclassical correlations play a crucial role in the development of quantum information science. The recent discovery that nonclassical correlations can be present even in separable (nonentangled) states has broadened this scenario. This generalized quantum correlation has been increasing in relevance in several fields, among them quantum communication,… (More)

- T B Batalhão, A M Souza, +4 authors R M Serra
- Physical review letters
- 2015

Irreversibility is one of the most intriguing concepts in physics. While microscopic physical laws are perfectly reversible, macroscopic average behavior has a preferred direction of time. According to the second law of thermodynamics, this arrow of time is associated with a positive mean entropy production. Using a nuclear magnetic resonance setup, we… (More)

- Alexandre M Souza, Gonzalo A Alvarez, Dieter Suter
- Physical review letters
- 2011

Dynamical decoupling (DD) is a popular technique for protecting qubits from the environment. However, unless special care is taken, experimental errors in the control pulses used in this technique can destroy the quantum information instead of preserving it. Here, we investigate techniques for making DD sequences robust against different types of… (More)

- Tiago B Batalhão, Alexandre M Souza, +7 authors Roberto M Serra
- Physical review letters
- 2014

We report the experimental reconstruction of the nonequilibrium work probability distribution in a closed quantum system, and the study of the corresponding quantum fluctuation relations. The experiment uses a liquid-state nuclear magnetic resonance platform that offers full control on the preparation and dynamics of the system. Our endeavors enable the… (More)

In this paper we present an analog of the Bell's inequalities violation test for N qubits to be performed in a nuclear magnetic resonance (NMR) quantum computer. This can be used to simulate or predict results for different Bell's inequalities tests, with distinct configurations and larger number of qubits. To demonstrate our scheme, we implemented a… (More)

- Alexandre M. Souza, Andre Gavini-Viana, +4 authors Tito J. Bonagamba
- Quantum Information & Computation
- 2010

In this work we applied a quantum circuit treatment to describe the nuclear spin relaxation. From the Redfield theory, we were able to describe the quadrupolar relaxation as a computational process in the case of spin 3/2 systems, through a model in which the environment is comprised by five qubits and three different quantum noise channels. The interaction… (More)

- J P S Peterson, R S Sarthour, +5 authors L C Céleri
- Proceedings. Mathematical, physical, and…
- 2016

Landauer's principle sets fundamental thermodynamical constraints for classical and quantum information processing, thus affecting not only various branches of physics, but also of computer science and engineering. Despite its importance, this principle was only recently experimentally considered for classical systems. Here we employ a nuclear magnetic… (More)

- Alexandre M Souza, Gonzalo A Álvarez, Dieter Suter
- Philosophical transactions. Series A…
- 2012

Quantum computers, which process information encoded in quantum mechanical systems, hold the potential to solve some of the hardest computational problems. A substantial obstacle for the further development of quantum computers is the fact that the lifetime of quantum information is usually too short to allow practical computation. A promising method for… (More)

- Patrice A Camati, John P S Peterson, +5 authors Roberto M Serra
- Physical review letters
- 2016

Maxwell's demon explores the role of information in physical processes. Employing information about microscopic degrees of freedom, this "intelligent observer" is capable of compensating entropy production (or extracting work), apparently challenging the second law of thermodynamics. In a modern standpoint, it is regarded as a feedback control mechanism and… (More)