Talk @UFF, Luis Gustavo Soares (UFF), Friday June 29th, 11.00

Next Friday, June 29th, at 11.00 in room A5-01 we’ll have our next group talk at UFF. This time Luis Gustavo Soares (IF-UFF) will be talking on “Squeezing no oscilador paramétrico ótico injetado com momento angular orbital”. All are welcome! For an abstract, please see below. Read the rest of this entry »

Advertisements

Talk @UFRJ, Diego Wisniacki, Thursday 28/06, 15H30

The Quantum Optics and Information Group (UFRJ) is proud to announce the last seminar of the semester, which will be given by Diego Wisniacki (UBA). We invite all to come!

See the details of the talk below:

THURSDAY, June 28th, at 15H30
in room 343 (3rd floor of block A of the Technology Center building)

“Quantum Optimal Control: Landscape topology and minimum control time”
Diego Wisniacki (UBA)

Abstract:
The core problem in optimal control theory applied to quantum systems is to determine the temporal shape of an applied field in order to maximize the expectation value of some physical observable. The functional which maps the control field into a givenvalue of the observable defines a Quantum Control Landscape (QCL). In this talk I will analyze the rich structure of the QCL of the paradigmatic Landau-Zener two-level model, studying several features of the optimized solutions, such as their abundance, spatial distribution and fidelities. We are able to rationalize several geometrical and topological aspects of the QCL of this simple model and the effects produced by the constraints. Our study opens the doorfor a deeper understanding of the QCL of general quantum systems.
________________________________________________________________________________

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


Talk @UFRJ, Daniel Brod, Monday 25/06, 15H30

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

See the details of the talk below:

MONDAY, June 25th, at 15H30
in room 343 (3rd floor of block A of the Technology Center building)

“Simulação clássica de óptica linear com perdas”
Daniel Brod (UFF)

Abstract:
Neste seminário, vou discutir um esquema para simulação clássica de experimentos de óptica linear sujeitos a perdas, focando especialmente nas condições que tornam essa simulação eficiente. Considere um experimento com as etapas a seguir: (i) preparamos um estado de Fock de n fótons, (ii) propagamos esse estado por um interferômetro (i.e. um circuito de divisores de feixe) de m modos, (iii) medimos todas as saídas do interferômetros na base de Fock. Esse experimento é a base do modelo computacional conhecido como BosonSampling (ou amostragem bosônica), mas também pode representar diversas tarefas de processamento de informação quântica baseadas em óptica linear. Vou descrever algumas formas diferentes de modelar perdas de fótons e seu efeitos sobre o poder computacional desses sistemas. O resultado central que vou descrever mostra que, se S é o número de divisores de feixe que cada fóton tem que atravessar, um experimento de amostragem bosônica já se torna simulável classicamente se S cresce logaritmicamente com n. Isso coloca limitações sobre tentativas, no futuro próximo, de demonstrar a “supremacia computacional quântica” através da óptica linear. No caminho para esse resultado também provamos em que condições podemos supor que perdas ocorrem no início de um interferômetro, que é um resultado de interesse independente para a comunidade de óptica linear.
________________________________________________________________________________

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


Talk @UFRJ, Gabriel Landi, Monday 11/06, 15H30

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

See the details of the talk below:

MONDAY, June 11th, at 15H30
in room 343 (3rd floor of block A of the Technology Center building)

Gabriel Landi (USP)

Abstract:
Irreversibility is an emergent concept, stemming from the complex interaction of a macroscopically large number of particles. It is also one of the most important concepts in thermodynamics, with ramifications in diverse fields. Understanding irreversibility from the microscopic level constitutes an active topic of research, particularly in the case of quantum system where irreversibility is known to emerge due to the entanglement between a system and its environment. In this lecture I will discuss recent results concerning the use of quantum phase space technique to establish measures of entropy production, the key quantifier of irreversibility. We will show how our formalism enables one to identify phase space currents operating both in the system and in the bath and which are ultimately responsible for the emergence of irreversibility. Our model also allows full control over the environment’s degrees of freedom, which allows us to study also the interplay between irreversibility and the degree of non-Markovianity in a system. As we show, the system-environment mutual information is not a faithful witness of non-Markovianity, whereas the entropic distance of the environment from its initial state is. Finally, we will also discuss an application of these concepts to construct Onsager’s transport theory for the combined transfer of energy and squeezing in bosonic systems.
________________________________________________________________________________

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


Talk @UFF: Alan Costa Santos, Friday June 8th, 11.00

This week’s talk at the Infoptics group at UFF will be given by Alan Costa Santos (UFF) next Friday, June 8th at 11.00 in room A5-01. His talk’s title is “Evoluções não-transicionais generalizadas: Teoria e experimento”, all are welcome! For an abstract, please see below. Read the rest of this entry »


Brandão + Sahinoglu minicourse on Quantum Entanglement: Deadline June 23rd 2018. Don´t miss it!

The deadline for the “Mini-course  on Quantum Entanglement: From Quantum Information to Many-Body Physics and Beyond” approaches: June 23rd 2018. Don´t miss it, sign up for it!

More infos: http://www.ictp-saifr.org/brandao-minicourse-on-quantum-information/

qinfo-poster

 


Talk @UFRJ, Daniel Felinto, Monday 04/06, 15H30

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

See the details of the talk below:

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

“Closed Quantum Systems: exploring the coherent nature of spontaneous emission”
Daniel Felinto (UFPE)

Abstract:
The formation of collective entangled states on atomic ensembles is heralded by detection of photons spontaneously emitted by the sample. Its origin is the coherent interaction of atoms with the quantum reservoir of vacuum modes. Control of this process leads to important applications in quantum information. Here we present our recent work on the problem, focusing on two fronts. We first develop a bottom-up approach to the study of superradiance from particular quantum states. Later, we introduce our first results on non-volatile atomic memories generated in the linear scattering of light by a cold atomic cloud.

________________________________________________________________________________

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