“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!

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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


Talk @UFF, Gabriel Bié Alves, Friday April 7th, 11:00

Next Friday, April 7th, at 11:00 in room A5-01, we’ll have our next group seminar at the Infoptics group at UFF. Gabriel Bié Alves, now here at UFF, will talk about “Amplificação de valores fracos e metrologia quântica”. All are welcome! Please see an abstract below. Read the rest of this entry »


New article: Coarse graining a non-Markovian collisional model

Title: Coarse graining a non-Markovian collisional model

Authors: Nadja K. Bernardes, Andre R. R. Carvalho, C. H. Monken, and Marcelo F. Santos

Journal reference: Phys. Rev. A 95, 032117 (2017)

Media cover: Time, Randomness, and Correlations in a Quantum Model

Abstract: The dynamics of systems subjected to noise is called Markovian in the absence of memory effects, i.e., when its immediate future depends only on its present. Time correlations in the noise source may generate non-Markovian effects that, sometimes, can be erased by appropriately coarse graining the time evolution of the system. In general, the coarse-graining time tCG is taken to be much larger than the correlation time τ but no direct relation between them is established. Here we analytically obtain a relation between tCG and τ for the dynamics of a qubit subjected to a time-correlated environment. Our results can be applied in principle to any distribution of the environmental correlations and can be tested through a collisional model where the qubit sequentially interacts with correlated qutrits.


Talk@UFF, 31/3, 11:00, Vasilis Kiosses (UFG)

Next Friday (31/3) at 11:00, Room A5-01, we’ll be resuming the quantum information/quantum optics talks at our Infoptics group. This week we’ll have Vasilis Kiosses (UFG) talking about “Spin and localization of relativistic fermions and uncertainty relations”. All are welcome to attend! Please see below for an abstract. Read the rest of this entry »


Postdoc positions available at the IIP – Natal

Our good friend Rafael Chaves (IIP-Natal) has few postdoctoral positions available. I copy below his e-mail announcing the positions.

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Dear colleagues,

I would like to bring to your attention a few postdoctoral positions available at the International Institute of Physics (IIP, Natal, Brazil) in the fields of Quantum Information and Foundations of Quantum Mechanics.

Successful candidates should demonstrate a high level of expertise and strong academic record working within these or closely related areas. Strong ability of a candidate to conduct interdisciplinary research in those and the other fields of research at IIP will be considered as an additional merit by the Selection Committee.

Applications should be sent to Mr. Rodrigo Lopes (r.lopes@iip.ufrn.br), containing a CV with a list of publications, a short research statement and at least two letters of reference (in English).

The post-doctoral appointments will be for two years (extendable to two more years depending on mutual agreement) with a tax free monthly salary of R$ 7.000,00 (seven thousand Brazilian Reais, around 2.250,00 US dolars).

Further information about IIP, this and other funding possibilities can be found at

http://www.iip.ufrn.br/news#

Best regards,

Rafael Chaves
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New article: Vestiges of quantum oscillations in the open evolution of semiclassical states

Quantum Information Group @ CBPF

Title: Vestiges of quantum oscillations in the open evolution of semiclassical states

Author: Alfredo M. Ozorio de Almeida (qig@CBPF)

Link: https://arxiv.org/abs/1703.08533

Abstract: A single wave component of a quantum particle can in principle be detected by the way that it interferes with itself, that is, through the local wave function correlation. The interpretation as the expectation of a local translation operator allows this measure of quantum wavyness to be followed through the process of decoherence in open quantum systems. This is here assumed to be Markovian, determined by Lindblad operators that are linear in position and momentum. The limitation of small averaging windows and even smaller correlation lengths simplifies the semiclassical theory for the evolving local correlation. Its spectrum has a peak for each classical momentum, subjected to Gaussian broadening with decoherence. These spectral lines can be clearly resolved even after the Wigner function has become positive: The correlations located…

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QM Talks@CBPF: Alex Bouvrie — 29.03, 16h00

Quantum Information Group @ CBPF

We resume our series of seminars with a talk by Alex Bouvrie, a postdoc here in the qig@cbpf. Indeed, Alex has just being awarded a new postdoc fellowship (PCI), which will allow him to stay a little longer with us. Luckly for us!

This time he’ll tell us about his latest results on composite fermions, and how the entanglement between them explains some features of experiments producing  Bose-Einstein condensates with fermions… got confused? Check out the details of his talk below,  and see you there!

Title: Quantum information in ultracold interacting Fermi gases

Speaker: Alex Bouvrie (CBPF)

Coordinates: room 601D, CBPF. 29.03, 16h00

Abstract: Recently the quantum information group of the CBPF showed that the application of the composite bosons theory [1] to ultracold  interacting Fermi gases is remarkable [2,3]. The effects of the underlying fermionic structure of composite bosons (molecules made from two fermions) formed in two-component Fermi gases…

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