Daniel Brod soon to join the UFF group as faculty

We have just got the good news that my former PhD student Daniel Jost Brod will soon join the Infoptics group at UFF as faculty. After his PhD, Daniel spend 2 1/2 years a post-doc at Perimeter Institute, and had since last March been back at UFF as a postdoc. Daniel’s research focuses on restricted models of quantum computation, linear and non-linear optics, and foundational issues. He’s a friend and long-time collaborator of mine, I’m very happy with the outcome, it’s a great addition to the quantum information community in Rio.

Congratulations Daniel, welcome aboard, Professor!

Here’s a picture of the first, improvised celebration yesterday, when the concurso’s result was announced.

daniel_celebration

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Talk @UFRJ, Breno Marques, Monday 04/12, 15H30

The Quantum Optics and Information Group (UFRJ) is proud to announce next week’s seminar, which will be given by Breno Marques (USP). We invite all to come!

See the details of the talk below:

MONDAY, December 4th, at 15H30
in room 343 (3rd floor of block A of the Technology Center building)

“Jogos de Comunicação Revelam Contextualidade de Preparação”
Breno Marques (USP)

Abstract:
Um jogo de comunicação consiste em um grupo completar uma tarefa conjuntamente dada alguma regra que restringe a comunicação entre os jogadores. Esse tipo de jogo pode ser usado como ferramenta para estudar limitações de teorias física. Pode-se testar usando jogos de comunicação se uma teoria é contextual de preparação. Nesse palestra será discutido o que é uma teoria contextual de preparação e como podemos usar um jogo de comunicação para mostrar que a mecânica quântica é um desses casos. Além disso será mostrado que preparação de contextualidade tem uma correspondência direta com correlações quânticas separadas especialmente que obedecem o princípio de não-sinalização. Também será mostrado a realização experimental demostrando uma grande violação das restrições de uma teoria não-contextual de preparação.
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You can incorporate our calendar to your Google Calendar and have information about all the confirmed seminars using this link.


Talk @UFF, Jacopo Viti (IIP, Natal), Wednesday Nov. 29th, 11:00

Next Thursday and Friday we’ll be having the II Quantum Rio workshop at CBPF. So our weekly seminar at the infoptics group at UFF will exceptionally be on Wednesday, November 29th, at 11:00 in room A5-01. Jacopo Viti (IIP, Natal) will be talking about “Analytic solution of the Domain Wall non-equilibrium stationary state”, all are welcome to attend! For an abstract, please see below. Read the rest of this entry »


Talk @UFRJ, Nadja Bernardes, Monday 27/11, 15H30

The Quantum Optics and Information Group (UFRJ) is proud to announce next week’s seminar, which will be given by Nadja Bernardes (UFPE). We invite all to come!

See the details of the talk below:

MONDAY, November 27th, at 15H30
in room 343 (3rd floor of block A of the Technology Center building)

“Probing quantum fluctuation theorems in engineered reservoirs”
Nadja Bernardes (UFPE)

Abstract:
Fluctuation Theorems are central in stochastic thermodynamics, as they allow for quantifying the irreversibility of single trajectories. Although they have been experimentally checked in the classical regime, a practical demonstration in the framework of quantum open systems is still to come. Here we propose a realistic platform to probe fluctuation theorems in the quantum regime. It is based on an effective two-level system coupled to an engineered reservoir, that enables the detection of the photons emitted and absorbed by the system. When the system is coherently driven, a measurable quantum component in the entropy production is evidenced. We quantify the error due to photon detection inefficiency, and show that the missing information can be efficiently corrected, based solely on the detected events. Our findings provide new insights into how the quantum character of a physical system impacts its thermodynamic evolution.
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You can incorporate our calendar to your Google Calendar and have information about all the confirmed seminars using this link.


The Quantum Rio Workshop strikes back!

The time has come. Again. Next week the quantum information community from Rio and surrounds will gather at CBPF to show what we’ve been up to this year, what we are planning for 2018. It will be an informal, relaxed, kind of family meeting. The idea of the workshop is to foster more interaction and collaboration among the quantum information/quantum optics researchers in the area.

Information about the event can be found at https://quantumrio.wordpress.com/quantumrioworkshop2/.

Please get in touch if you’re planning on attending (emailing Ruynet, Ernesto or Fernando), so that we can leave a participants list at the reception of CBPF, which is necessary for security purposes.

See you there!


New article: Quantum Algorithm for Simulating the Wave Equation

Quantum Information Group @ CBPF

Title: Quantum Algorithm for Simulating the Wave Equation

Authors: Pedro C.S. Costa (CBPF), Stephen Jordan (NIST/Maryland), Aaron Ostrander (Maryland)

Link: https://scirate.com/arxiv/1711.05394

Abstract: We present a quantum algorithm for simulating the wave equation under Dirichlet and Neumann boundary conditions. The algorithm uses Hamiltonian simulation and quantum linear system algorithms as subroutines. It relies on factorizations of discretized Laplacian operators to allow for improved scaling in truncation errors and improved scaling for state preparation relative to general purpose linear differential equation algorithms. We also consider using Hamiltonian simulation for Klein-Gordon equations and Maxwell’s equations.

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New article: Reversing the thermodynamic arrow of time using quantum correlations

Quantum Information Group @ CBPF

Title: Reversing the thermodynamic arrow of time using quantum correlations

Authors: Kaonan Micadei, John P. S. Peterson, Alexandre M. Souza, Roberto S. Sarthour, Ivan S. Oliveira, Gabriel T. Landi, Tiago B. Batalhão, Roberto M. Serra, Eric Lutz

Link: https://arxiv.org/abs/1711.03323

Abstract: The second law permits the prediction of the direction of natural processes, thus defining a thermodynamic arrow of time. However, standard thermodynamics presupposes the absence of initial correlations between interacting systems. We here experimentally demonstrate the reversal of the arrow of time for two initially quantum correlated spins-1/2, prepared in local thermal states at different temperatures, employing a Nuclear Magnetic Resonance setup. We observe a spontaneous heat flow from the cold to the hot system. This process is enabled by a trade off between correlations and entropy that we quantify with information-theoretical quantities.

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