Talk @UFF, Arash Jafarizadeh (UFF), Friday July 5th, 11:00

This Friday’s talk at the Infoptics group at UFF will be given by Arash Jafarizadeh (UFF). It’ll be next Friday, July 5th, at 11:00, in room A5-01, and its title is “Bipartite entanglement entropy of the excited states of the free 
fermions”. All are welcome! Please find the abstract below.

Data: Sexta-Feira 05/07/2019, Sala A5-01, 11 am.

Palestrante: Arash Jafarizadeh (UFF)

Title: Bipartite entanglement entropy of the excited states of the free 
fermions.

Abstract:  The bipartite entanglement entropy for the ground state of 
many models including free fermions, coupled harmonic oscillators, 
quantum spin chains, CFTs, and topological systems has been studied 
vastly. We know that there is universality and we can write a quantum 
field theory for the ground state of the quantum many-body systems near 
or at the critical point. However, for excited states, some volume-law 
behavior has been reported. Also, some sort of universality has been 
reported for the average of the entanglement entropy over the excited 
states. In this work, we present some exact results for the entanglement 
entropy of the excited states of free fermions in one-dimension. We also 
comment on the average of the entanglement entropy and possible methods 
to measure it.

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Talk @UFF, Rafael Bellas (UFF), Friday June 28th, 11:00

This week’s talk at the Infoptics group at UFF will be given by Rafael Bellas (UFF), next Friday, June 28th, at 11:00 in room A5-01. The title is “Transição Medida da fase geométrica em um Oscilador Paramétrico Ótico”, and all are welcome to attend! Please see below for more details.

Data: Sexta-Feira 28/06/2019, Sala A5-01, 11 am.

Palestrante: Rafael Bellas (UFF)

Title: Transição Medida da fase geométrica em um Oscilador Paramétrico Ótico

Abstract: Neste seminário vou falar do experimento que estou 
desenvolvendo no Laboratório de Óptica Quântica. O experimento tem como objetivo final medir a fase geométrica, por vezes
conhecida como a fase de Berry, em um dispositivo chamado Oscilador  Paramétrico Ótico (OPO).
Iniciarei minha apresentação com uma introdução pouco formal sobre o que é o OPO. Na sequência, apresentarei a fase geométrica, assim como expor uma maneira de se medir esta última a partir de um experimento de interferência entre os feixes de luz laser produzidos pelo nosso OPO. Apresentarei alguns resultados preliminares no final.


Talk @UFF, Kaled Dechoum (UFF), Friday June 7th, 11:00

This week’s talk at the Infoptics group at UFF will be given by Kaled Dechoum (IF-UFF), and its title is: “”Especulando sobre as ondas de de Broglie”. It’ll happen on Friday, June 7th, at 11:00 in room A5-01, all are welcome to attend. Please see below for an abstract.

Data: Sexta-Feira 07/06/2019, Sala A5-01, 11 am.

Palestrante: Kaled Dechoum (UFF)

Title: Título: Especulando sobre as ondas de de Broglie

Abstract:  Neste seminário irei especular sobre uma possível origem das 
ondas de de Broglie.


INCT-IQ outreach initiative

The INCT-IQ CNPq project involves 120 principal investigators in all over Brazil, doing research related to quantum information. If you’d like to follow Brazilian quantum information news and updates, besides the project’s website there’s now also a twitter account @InctQuantica , and a Facebook page you can “like” to follow.

The content includes descriptions of the different INCT-IQ groups and laboratories, events and new scientific results, all created and maintained by the researchers in the newly-formed Outreach Committee:

Profa. Vivian França – UNESP – Coordinator
Prof. Pierre-Louis de Assis – Unicamp – Coordinator
Prof. Carlos Eduardo de Souza – UFF
Profa. Nadja Bernardes – UFPE
Profa. Liliana Sanz – UFU
Profa. Paula Monteiro – Inst. Federal de Santa Catarina
Prof. Marcelo França – UFRJ – Contact with the management committee

Let’s support this initiative!


Talk @UFF, Marcelo França Santos (UFRJ), Friday May 31st, 11.00

This week’s talk at the Infoptics group at UFF will be given by Marcelo França Santos (UFRJ), and is titled: “Transição Markoviano-não-Markoviano em modelos colisionais”. It’ll happen next Friday, May 31st, at 11.00 in room A5-01, all are welcome! For an abstract, please see below.


Data: Sexta-Feira 31/05/2019, Sala A5-01, 11 am.

Palestrante: Marcelo França Santos (UFRJ)

Title: Transição Markoviano-não-Markoviano em modelos colisionais.

Abstract: Nesse seminário, apresentamos dois modelos colisionais nos 
quais analisamos a transição de dinâmica Markoviana para não-Markoviana advinda exclusivamente da correlação do reservatório. Discutimos diferentes dinâmicas e mostramos como simulá-las em diversos sistemas físicos. Abordamos também o coarse-graining temporal que leva à equação mestra nos modelos tradicionais de sistemas quânticos abertos.


Talk @UFF, A. Bramati (Lab. Kastler Brossel, Paris), Friday May 24th, 11.00

This week’s talk at the Infoptics group @UFF will be given by our visitor from Paris, A. Bramati (Laboratoire Kastler Brossel, UPMC-Sorbonne 
Universités). His talk’s title is “Quantum fluids of light and nano-photonics at LKB”, and it’s scheduled for next Friday, May 24th, at 11.00 in room A5-01. All are welcome! For an abstract, please see below.

Data: Sexta-Feira 24/05/2019, Sala A5-01, 11 am.

Speaker: A. Bramati (Laboratoire Kastler Brossel, UPMC-Sorbonne 
Universités)

Title: Quantum fluids of light and nano-photonics at LKB

Abstract: In this talk I will present an overview of the recent experiments performed in our group. The first part of the talk will be devoted to the so called quantum fluids of light [1], a wide family of systems where an effective photon-photon interaction can be engineered, resulting in a  hydrodynamical-like behavior. In particular I will focus on microcavity polaritons and atomic vapors. In polaritons, I will show how the development of flexible all-optical methods to inject a controlled orbital angular momentum in such systems results in the observation of
patterns of quantized vortices [2, 3]. These results open the way to the study of Abrikosov-like physics and new vortex collective phenomena. In Rubidium atomic vapors, I will present very recent experiments demonstrating the superfluid behavior in these media.

The second part of the talk will be devoted to our recent results on 
efficient room temperature single photon emitters based on core/shell colloidal semiconductor nanocrystals. By using asymmetric core/shell nanoparticles (dots-in-rods), blinking effects, multi-excitonic emission and 
polarization of the emitted photons can be simultaneously controlled by tuning the shell dimensions [4] allowing to achieve “state of the art” blinking-free sources of polarized single photons on-demand. Finally, I will discuss the different strategies we are pursuing to
develop hybrid photonic devices by coupling single nanocrystals with  various photonic structures like optical nanofibers, deep parabolic mirrors [5], liquid crystals [6] and semiconductor nanowires [7].


Talk @UFF, Ernesto Galvão, Friday May 17th, 11.00

I will be giving this week’s talk at our group at UFF. Please come to room A5-01, next Friday May 17th at 11.00 to hear me talk about “Dimension and coherence witnesses from SWAP tests”. For an abstract, please see below.


Room A5-01. Friday, May 17th, 2019, 11.00.

Speaker: Ernesto F. Galvão (UFF)

Title: Dimension and coherence witnesses from SWAP tests

Abstract: The SWAP test is a simple quantum circuit that projects onto the symmetric subspace of two quantum systems. When applied to two separable states, it results in a direct estimation of the two-state overlap Tr(rho sigma). Using many such tests, we can gather information about many pairwise overlaps of N states. I’ll show how this relational information can be used to witness quantum coherence, i.e. guarantee that the states are not diagonal in any single basis. I’ll also show how these tests can be used as a Hilbert space dimension witness. Finally, I’ll briefly describe how to implement these tests using linear optics.