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

Quantum Information Group @ CBPF

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…

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Talk @UFF, Márcio Taddei (UFRJ), Friday Nov. 10th, 11.00

Next Friday, Nov. 10th at 11.00 in room A5-01 we’ll have our next group seminar at UFF. This time Márcio Taddei (UFRJ) will be talking on “Superposição quântica de ordens causais”. All are welcome! for an abstract please see below. Read the rest of this entry »


Postdoctoral position in Quantum Information Theory at ICTP/SAIFR São Paulo

Dear colleagues,

I would like to draw your attention to a postdoctoral position in the fields of quantum computing, quantum information theory, and foundations of quantum mechanics. 

The postdoc will work with Prof. Leandro Aolita, who will be a regular visiting fellow at the International Centre for Theoretical Physics – South American Institute for Fundamental Research (ICTP/SAIFR), in São Paulo, Brazil, 

The centre — created in 2011 as a collaboration of ICTP (Trieste), the São Paulo State University (UNESP), and the São Paulo Research Funding Agency — has rapidly positioned itself as a South American hub for theoretical physics. It is located in the vibrant city of São Paulo and has a large number of postdocs and visitors, with an effervescent scientific agenda throughout the year. For further information about the centre see:

http://www.ictp-saifr.org/

The postdoctoral fellowship will be for 2 years, with a possible extension for another 2 years, and will pay an annual tax-free salary of 86,000 Brazilian reais (about US$ 2,200 monthly) as well as a yearly allowance of 12,900 Brazilian reais (about US$ 3950) for travelling and research expenses. In addition to that, other funds may be available too, and ICTP/SAIFR postdocs also have access to ICTP-SAIFR funds to invite visitors and organize activities.

Successful candidates should demonstrate a world-class academic track in the above-mentioned fields and a high level of scientific independence. Background in quantum algorithms and machine learning is specially welcome.

The position should be filled during the first semester of 2018. Applications are expected before December 15th 2017, and should be sent through the online application form at

http://www.ictp-saifr.org/?page_id=625

Best regards,

Leandro Aolita


QM Talks@CBPF: Marcelo F. Santos — 08.11, 16h00

Quantum Information Group @ CBPF

This week we have the pleasure to receive Marcelo F. Santos (UFRJ) as a speaker in our series QM Talks@CBPF. Marcelo and co-authors have recently put in the arXiv an intriguing paper: Photonic Counterparts of Cooper Pairs. This article, already accepted for publication in Physical Review Letters, attracted quite some attention (see here the Nature News feature on the article) for proposing that photons can interact inside a medium in a way very similar to that of electrons in a superconducting material, forming the so-called Cooper pairs. Got interested?! Then do not miss Marcelo’s talk. The info follows:

Title: Photonic Cooper pairs

Speaker: Marcelo F. Santos (UFRJ)

Coordinates: room 601C, CBPF. 08.11, 16h00

Abstract: Photons are the elementary particles of light. Contrary to most particles, photons do not interact directly with each other in vacuum. However, when propagating in a material, e.g. water, photon pairs may interact through the medium…

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Talk @UFRJ, Marcelo Terra Cunha, Monday 06/11, 15H30

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

See the details of the talk below:

MONDAY, November 6th, at 15H30
in room 343 (3rd floor of block A of the Technology Center building)

“Is quantum theory just about exclusivity?”
Marcelo Terra Cunha (UNICAMP)

Abstract:
Quantum Theory is a very successful set of rules about calculating probabilities of measurement outcomes. But what is it really about? This naive question is still open… Probably, the most basic non-classical feature of quantum theory is contextuality: the failure of conciliating the probabilities prescribed by quantum theory with averaging over models with definite answers for any question. In this talk we must review the notion of contextuality and its exclusivity-graph approach, introduced by Cabello, Severini, and Winter. Then we will elaborate on the question: can the exclusivity principle generate the same set of correlations of quantum theory?
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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 @UFRJ, Alexandre Baron, Monday 30/10, 15H30

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

See the details of the talk below:

MONDAY, October 30th, at 15H30
in the LADIF auditorium (4th floor of block A of the Technology Center building)

“Particle-correlated states: A non-perturbative treatment beyond mean field”
Alexandre Baron

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.

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You can incorporate our calendar to your Google Calendar and have information about all the confirmed seminars using this link.


QM Talks@CBPF: Thiago Guerreiro — 01.11, 16h00

Quantum Information Group @ CBPF

Following with our series of seminars QM Talks@CBPF, the next talk will be given by Thiago Guerreiro (PUC-RJ). Thiago has just returned to Brazil after postdoc and PhD in the group of Nicolas Gisin. In this “welcome back” talk, Thiago will tell us about his recent results and also about his research plans. Be sure to be there!

Title: Table-top high-energy quantum physics

Speaker: Thiago Gurreiro (PUC-RJ)

Coordinates: room 601C, CBPF. 01.11, 16h00

Abstract: Often in history, important measurements and discoveries were preceded by long periods of technical development. Today, fundamental physics may be at the edge of a new exciting age which will exploit the development of so-called quantum technologies. In this talk I will discuss examples of how precise control over quantum matter can lead to new developments in fundamental physics, from gravitational waves to the search for new particles and interactions of nature.

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