Open faculty position at IFSC-USP

The Department of Physics and Materials Science, at the São Carlos Institute of Physics, is seeking to make one faculty appointment for a theoretician in the area of atomic and molecular physics: light-matter interaction, out-of-equilibrium scattering processes, optical lattices with extensions to statistical physics.

Click here to download more informations about the call. You can also check the IFSC’s Open Positions page.


QM Talks@CBPF: Víctor Montenegro — 28.06, 16h00

Quantum Information Group @ CBPF

Next week in our QM Talks@CBPF series we’ll have a talk by Víctor Montenegro, from the Pontificia Universidad Catolica de Chile. Victor holds a postdoc position at the PUC-Chile in the group lead by Miguel Orszag — a group which has contributed a lot to the development of the quantum optics area.

Victor is on vacation in Rio, and he was very kind to contact us and to accept to give a talk at CBPF. See the details of the talk below, and be sure to be there!

Title: Macro-mechanical quantum state superposition via spin post-selection in dispersive systems

Speaker: Víctor Montenegro (PUC- Chile)

Coordinates: room 601C, CBPF. 28.06, 16h00

Abstract: Macroscopic quantum superposition states are fundamental to test the classical-quantum boundary and present suitable candidates for quantum technologies. Although the preparation of such states have already been realized, the existing setups commonly consider external driving and resonant interactions, which…

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QM Talks@CBPF: Tobias Micklitz — 21.06, 16h00

Quantum Information Group @ CBPF

Our series of seminars continues this week with Tobias Micklitz (CBPF). Tobias is an expert on many-body problems within condensed matter, especially on issues related to Anderson’s location. Recently, we’ve been discussing some ideas at the interface between condensed matter and quantum information. I’m sure something nice will come out of this interaction.

See the details of the talk below, and be sure to not miss it. See you there!

Title: Disordered Quantum Systems from Anderson- to many-body localization

Speaker: Tobias Micklitz (CBPF)

Coordinates: room 601C, CBPF. 21.06, 16h00

Abstract: Disorder is known to have dramatic effects on single particle-dynamics in low dimensional quantum systems. The absence of diffusion in dimensions smaller than three emerges within a single-particle picture where non-interacting particles, scattering off disorder, interfere with themselves and effectively get localized to a finite region in space. This ‘Anderson localization’ originates from the quantum-mechanical wave-nature of particles and is…

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QM Talks@CBPF: Fernando Nicácio — 07.06, 16h00

Quantum Information Group @ CBPF

Our next seminar from the series QM Talks@CBPF will be given by Fernando Nicácio, aka, Boiúna (or is it the other way around?).
See the details below. See you there!

Title: Determinando propriedades de estados estacionários diretamente
das interações do sistema com o ambiente

Speaker: Fernando Nicácio (UFRJ)

Coordinates: room 601C, CBPF. 07.06, 16h00

Abstract: Considerando estados estacionários de um sistema de variáveis contínuas evoluindo sob uma dinâmica não-unitária, revelamos a conexão entre propriedades e simetrias do sistema com os parâmetros dinâmicos da evolução. Em particular, estabelecemos uma relação entre a equação de Lyapunov para sistemas dinâmicos não-Hamiltonianos e as soluções estacionárias de uma equação mestra de Lindblad independente do tempo para modos bosônicos. Explorando relações de “bona fide”, as quais são utilizadas para caracterizar propriedades quânticas genuínas (emaranhamento, “steerabilidade”, classicalidade), obtemos condições sobre os parâmetros dinâmicos da equação de Lindblad que fazem com que o sistema seja conduzido a…

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New article: Emerging Dynamics Arising From Quantum Mechanics

Quantum Information Group @ CBPF

Title: Emerging Dynamics Arising From Quantum Mechanics

Authors: Cristhiano Duarte (UFMG), Gabriel Dias Carvalho (CBPF), Nadja K. Bernades (UFMG), Fernando de Melo (CBPF)

Link: https://arxiv.org/abs/1705.01604

Abstract: Physics dares to describe Nature from elementary particles all the way up to cosmological objects like cluster of galaxies and black holes. Although a unified description for all this spectrum of events is desirable, an one-theory-fits-all would be highly impractical. To not get lost in unnecessary details, effective descriptions are mandatory. Here we analyze what are the dynamics that may emerge from a fully quantum description when one does not have access to all the degrees of freedom of a system. More concretely, we describe the properties of the dynamics that arise from Quantum Mechanics if one has only access to a coarse grained description of the system. We obtain that the effective channels are not necessarily of Kraus form, due to correlations between…

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Master dissertation defense @ CBPF: Pedro Correia — 05.05, 14h00

Quantum Information Group @ CBPF

This Friday, Pedro Correia, student at the qig@CBPF, will defend his master dissertation.
The dissertation title is “Entanglement in Coarse-grained Systems”, and it contains results on: i) coarse-grained entanglement dynamics in spin-chains, and ii) coarse-grained entanglement in micro-macro systems, with an application to the measurement problem. The details of the defense talk are below. Everyone is invited to attend it.
Boa defesa, Pedrinho!

Title: Entanglement in Coarse-grained Systems

Candidate: Pedro Correia (qig@CBPF)

Dissertation Committee: Marcelo Sarandy (UFF), Roberto Sarthour (CBPF), Gabriel Aguilar (UFRJ), Raul Vallejos (CBPF), and Fernando de Melo (CBPF).

Coordinates: Auditorium 6th floor, CBPF. 05.05, 14h00.

Abstract: In the present work we investigate the behavior of entanglement in coarse-grained systems. Our approach is basically composed of two parts.
In the first, we construct a coarse graining map that describes the entanglement dynamics in a spin-chain considering a “blurred” detection of the system. In the second part we derive…

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“Quantum Bayesian networks: the physics of nonlocal events”

Here is the announcement of the third event of the series: “Quantum Bayesian networks: the physics of nonlocal events”. The last one in Natal was great!

____________________________________________

Dear colleagues,

We are organising a workshop on quantum networks sponsored by the Foundational Questions Institute (FQXI) under the project “Quantum Bayesian networks: the physics of nonlocal events”. This will the last in a series of three workshops, the first of which took place in Barcelona (http://qbnetworks.icfo.eu/), and the second in Natal, Brazil (http://iip.ufrn.br/eventsdetail.php?inf===QTUVkM).

The workshop will take place at the Department of Computer Science (http://www.cs.ox.ac.uk) at the University of Oxford, UK on 1st-4th August 2017.

The workshop webpage is: http://www.cs.ox.ac.uk/qnetworks2017

We have the following invited speakers:

Fabio Costa (University of Queensland)
Robin Evans (University of Oxford)
Lucien Hardy (Perimeter Institute)
Matt Leifer (Chapman University)
Ognyan Oreshkov (University of Oxford)
Jacques Pienaar (IIP Natal, Brazil)
Stefano Pironio (Université Libre de Bruxelles)
Ana Belén Sainz (Perimeter Institute)
Philip Walther (University of Vienna)
Stephanie Wehner (Delft University of Technology)

In addition, we anticipate accepting additional contributed talks and posters (deadline 28th May 2017). Abstract submission is open at https://easychair.org/conferences/?conf=qnetworks2017.

Registration will be opening shortly so please check back in the coming days to register. We are also offering limited financial support to students and postdoctoral researchers. Please consult the workshop website for details.

Background: Causality is a crucial concept for our understanding of nature. In relativity, the objective properties of a system are dictated by the causal relations between events in spacetime. While quantum mechanical predictions comply with relativity, objective properties do not satisfy the same causal relations—the phenomenon known as non-locality. Quantum mechanics is consistent with special relativity at an operational level but appears to violate it at an ontological level. This reveals a deep subtlety in the way that quantum theory and relativity co-exist. Understanding this subtlety will be crucial to understanding how physical theories lead to a notion of things happening through the language of causality. The aim of the workshop is to explore all these different concepts, bringing together researchers interested in causality within quantum physics.

We look forward to seeing you in Oxford!

Antonio Acín
Rafael Chaves
Matty Hoban