QM Talks@CBPF: Alexandre B. Tacla — 13.11, 16h00

Our next talk in the series QM Talks@CBPF will be delivered by Alexandre B. Tacla (Glasgow). Alexandre has many interests, and a broad knowledge. In this talk he will tell us about his recent results on how to deal with complex many-body systems in an efficient way.

Note that this week, due to the holiday celebrating the Proclamation of the Republic in Brazil on Wednesday, the talk will be on Monday. See the full info below, and be sure to not miss this talk!

Title: Particle-correlated states: A non-perturbative treatment beyond mean field

Speaker: Alexandre B. Tacla (Glasgow)

Coordinates: room 601C, CBPF. 13.11 (Monday), 16h00

Abstract: Many useful properties of dilute Bose gases at ultralow temperatures are predicted precisely by the (mean-field) product-state Ansatz, in which all particles are in the same single-particle state. However, in situations where particle-particle correlations become important, this technique fails and more sophisticated methods are required. In this talk, I will introduce a new set of states that include quantum correlations nonperturbatively: The particle-correlated state (PCS) of N = l × n particles is derived by symmetrizing the n-fold product of an l-particle quantum state. Quantum correlations of the l-particle state “spread out” to any subset of the N bosons by symmetrization. Specifically, I will present the PCS theory for the ground-state of bosonic systems constructed from a two-particle pure state (l=2) [Phys. Rev. A 96, 023621 (2017)]. In particular, I will show (i) how to simulate PCS efficiently for large systems and (ii) how to calculate analytically the reduced density matrices (correlation functions) directly from the PCS normalization factor. Lastly, I will discuss the efficacy of PCS when applied to the two-site Bose-Hubbard model. The key result is that the PCS Ansatz can faithfully represent the exact ground-state over the entire parameter region from a superfluid to a Mott insulator.


QM Talks@CBPF: Daniel S. Tasca — 27.09, 16h00

We continue our series of seminars with a talk by Daniel S. Tasca (IF-UFF). Daniel and co-authors have recently performed an experiment where they verify that a coarse graining procedure might break the mutual unbiasedness between conjugate variables. That sounds interesting! To know more about the topic, check out Daniel’s article here, and attend to his talk. See you there.

Title: Mutual Unbiasedness in Coarse-grained Continuous Variables

Speaker: Daniel S. Tasca (IF-UFF)

Coordinates: room 601C, CBPF. 27.09, 16h00

Abstract: The notion of mutual unbiasedness for coarse-grained measurements of quantum continuous variable systems is considered. It is shown that while the procedure of “standard” coarse graining breaks the mutual unbiasedness between conjugate variables, this desired feature can be theoretically established and experimentally observed in periodic coarse graining. We illustrate our results in an optics experiment implementing Fraunhofer diffraction through a periodic diffraction grating, finding excellent agreement with the derived theory. Our results are an important step in developing a formal connection between discrete and continuous variable quantum mechanics.

Paraty VI: Registration is open!

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The time has come… again. The sixth edition of the Quantum Information School and Workshop is accepting applications.

In this edition we will be celebrating 10 years from the first “Quantum Paraty”. Ten years have passed but the relaxed atmosphere — great science, long lunch breaks, friendly people, a boat trip instead of the boring usual conference dinner, and Paraty itself –, that build up the reputation of Paraty as the coolest quantum information conference in the world, continue as our commandment. Ask people about it and register! All the info and registration form can be found in the conference webpage http://paratyquantum.info.

See you in Paraty!

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Quantum Rio Workshop, Dec. 7/8th

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Next week, on December 7th and 8th, in CBPF (at the 6th floor auditorium), we’ll have our first Quantum Rio Workshop, an informal gathering of the quantum information community in and around Rio, organized by Malena Hor-Meyll (UFRJ), Roberto Sarthour (CBPF) and Ernesto Galvão (UFF).

The idea of the workshop is to foster more interaction and collaboration among the quantum information/quantum optics researchers in the area. We’ve allocated half-hour talk slots to some of the group leaders, complemented by posters and coffee during the talk breaks, mostly by students (please encourage them to contribute!). The workshop will be financed by workshop fees (paid only by professors).

Please find the schedule below:

Wednesday, Dec. 7th:
9:00-09:30 Luiz Davidovich
9:30-10:00 Fernando Melo
10:00-10:30 coffee
10:30-11:00 Gabriel Aguilar
11:00-11:30 Alexandre Souza
11:30-12:00 Ernesto Galvão
12:00-14:00 lunch
14:00-14:30 José Augusto Huguenin/Alexandre Schmidt
14:30-15:00 Mohammad Rajabpour
15:00-16:00 coffee/posters
16:30-17:00 Marcelo França
17:00-17:30 Leandro Aolita
Thursday, Dec…

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BLOCO 2016

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———— Guest post by Jéssica O. de Almeida (UFRJ) e Gabriel D. Carvalho (CBPF) ————

Em outubro de 2016 acontecerá o BLOCO (Bienal Latinoamericana de Óptica Cuántica O), uma conferência satélite ao Quantum Optics. Essa conferência é voltada para os alunos da América Latina, dando oportunidade para que esses apresentem seus trabalhos. Professores também estão convidados, porém só poderão assistir as palestras e apresentar pôster. O evento será realizado no CBPF nos dias 19-21/10.

O BLOCO tem como objetivo dar oportunidade de alunos de pós-graduação e jovens pesquisadores latinos americanos exporem trabalhos na forma de seminários e pôsteres, além de trocar experiências científicas na América Latina. Isso fortalece os laços da comunidade de óptica quântica da América Latina, algo essencial para aumentar, ainda mais, a relevância internacional de nossos grupos.

As inscrições estão abertas! Veja mais informações e se inscreva no site https://bloco2016.wordpress.com/.

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Minicourse @CBPF: Enrique Solano – 15-17.08, 10h30

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In August, Enrique Solano (University of the Basque Country) will be visiting the Quantum Information and Quantum Optics Group at UFRJ. Solano got his PhD in 2000 at UFRJ under supervision of Nicim Zagury. Today he is the head of the Quantum Technologies for Information Science at the University of the Basque Country, and has published around 30 papers just in 2016. Many of these papers are about quantum simulations.

During his visit, Solano will give a set of three lectures on “Fundamentals and applications of quantum simulations”. Due to the Olympic Games, the course will be held at CBPF. See the information below and don’t miss this chance! If you are planning to attend this course, and you should do it, please send an e-mail to fmelo [at] cbpf.br, such that we can organize a corresponding lecture room and have a list of the participants at the entrance of…

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Quantumness: A Celebration of Luiz Davidovich’s research career on his 70th birthday

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Dear quantum people,

next June, our dear colleague Luiz Davidovich will complete 70 years. To celebrate this event, we are organizing a conference to celebrate the scientific career Luiz entitled Quantumness, to be held on the campus of UFRJ from 22 to 24 June 2016.


At this conference, the multiple facets of Luiz’s scientific career will be represented, with seminars covering topics in Quantum Optics, Quantum Information and Atomic Physics. The line up of speakers is amazing!


You don’t want to miss that, do you? Even better, there is no registration fee!
Register now at http://www.luizdavidovich2016.com
Registrations will be accepted in order of arrival, up to the capacity limit of the auditorium… and the available sits are running out fast!

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