Paraty VI: Registration is open!

quantum Rio

The time has come… again. The sixth edition of the Quantum Information School and Workshop is accepting applications.

In this edition we will be celebrating 10 years from the first “Quantum Paraty”. Ten years have passed but the relaxed atmosphere — great science, long lunch breaks, friendly people, a boat trip instead of the boring usual conference dinner, and Paraty itself –, that build up the reputation of Paraty as the coolest quantum information conference in the world, continue as our commandment. Ask people about it and register! All the info and registration form can be found in the conference webpage http://paratyquantum.info.

See you in Paraty!

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Open postdoc positions

The Brazilian Center for Research in Physics (CBPF), a research unit of the Ministry of Science, Technology, Innovations and Communications (MCTIC), has openings for 13 postdoctoral scholar positions in various research topics. The topics include quantum information, both theory and experiment.

Interested candidates can find information about the call at http://portal.cbpf.br/chamada-publica-pci-2016.

Contact us if you are willing to join our quantum information group as postdoc!

Quantum Rio Workshop, Dec. 7/8th

quantum Rio

Next week, on December 7th and 8th, in CBPF (at the 6th floor auditorium), we’ll have our first Quantum Rio Workshop, an informal gathering of the quantum information community in and around Rio, organized by Malena Hor-Meyll (UFRJ), Roberto Sarthour (CBPF) and Ernesto Galvão (UFF).

The idea of the workshop is to foster more interaction and collaboration among the quantum information/quantum optics researchers in the area. We’ve allocated half-hour talk slots to some of the group leaders, complemented by posters and coffee during the talk breaks, mostly by students (please encourage them to contribute!). The workshop will be financed by workshop fees (paid only by professors).

Please find the schedule below:

Wednesday, Dec. 7th:
9:00-09:30 Luiz Davidovich
9:30-10:00 Fernando Melo
10:00-10:30 coffee
10:30-11:00 Gabriel Aguilar
11:00-11:30 Alexandre Souza
11:30-12:00 Ernesto Galvão
12:00-14:00 lunch
14:00-14:30 José Augusto Huguenin/Alexandre Schmidt
14:30-15:00 Mohammad Rajabpour
15:00-16:00 coffee/posters
16:30-17:00 Marcelo França
17:00-17:30 Leandro Aolita
Thursday, Dec…

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QM Talks@CBPF: Yelena Guryanova — 30.11, 16h00

Title: Thermodynamics of quantum systems with multiple conserved quantities

Speaker: Yelena Guryanova (IQOQI- Institute for Quantum Optics and Quantum Information)

Coordinates: room 601D, CBPF. 30.11, 16h00

Abstract: We consider a generalisation of thermodynamics that deals with multiple conserved quantities at the level of individual quantum systems. Each conserved quantity, which, importantly, need not commute with the rest, can be extracted and stored in its own battery. Unlike in standard thermodynamics, where the second law places a constraint on how much of the conserved quantity (energy) that can be extracted, here, on the contrary, there is no limit on how much of any individual conserved quantity that can be extracted. However, other conserved quantities must be supplied, and the second law constrains the combination of extractable quantities and the trade-offs between them which are allowed. We present explicit protocols which allow us to perform arbitrarily good trade-offs and extract arbitrarily good combinations of conserved quantities from individual quantum systems.

New Article: Reliability of digitized quantum annealing and the decay of entanglement

In this new article we used our NMR quantum computer (only two qubits…), in collaboration with Frederico Brito (USP-SC), to simulate in a digital-analog way a quantum annealing process. We currently hold (as far as I know…) the record of Trotter steps (235) and gates (more than 2000) in a quantum simulation. Moreover, we were able to relate the quality of the computation with the amount of entanglement it generated. But don’t let this trick you: more entanglement does seem to relate with better computation quality, but it does not necessarily imply better-than-classical computation! See the plot and description below, and click here for the full article.

Computation Reliabilty. Experimental results for mean (time-average) success and fidelity (top panel) and maximum and mean entanglement (bottom panel), as a function of the applied magnetic field gradient. Classical algorithm is assumed to not suffer any kind of noise, as it is implemented in a classical computer.

Computation Reliabilty. Experimental results for mean
(time-average) success and fidelity (top panel) and maximum and mean
entanglement (bottom panel), as a function of the applied magnetic
field gradient. Classical algorithm is assumed to not suffer any kind
of noise, as it is implemented in a classical computer.

Title: Reliability of digitized quantum annealing and the decay of entanglement

Authors: John P. S. Peterson (CBPF), Roberto S. Sarthour (CBPF), Alexandre M. Souza (CBPF), Ivan S. Oliveira (CBPF), Frederico Brito (USP-SC), Fernando de Melo (CBPF)

Abstract: We performed a banged-digital-analog simulation of a quantum annealing protocol in a two-qubit Nuclear Magnetic Resonance (NMR) quantum computer. Our experimental simulation employed up to 235 Trotter steps, with more than 2000 gates (pulses), and we obtained a protocol success above 80%. Given the exquisite control of the NMR quantum computer, we performed the simulation with different noise levels. We thus analyzed the reliability of the quantum annealing process, and related it to the level of entanglement produced during the protocol. Although the presence of entanglement is not a sufficient signature for a better-than-classical simulation, the level of entanglement achieved relates to the fidelity of the protocol.

QM Talks@CBPF: David Jennings – 30.08, 16h00

The Olympic games are over, but Rio is still receiving many visitors. Among them, next week, we welcome David Jennings, from Imperial College London. David’s interests are really broad, ranging from foundational issues in quantum mechanics up to cosmology. From the micro up to the macro, his research also crosses quantum thermodynamics, and this is the subject he’ll tell us about in our next QM Talks@CBPF. See the description below, and see you there!

Title: Thermodynamics and quantum information theory

Speaker: David Jennings (Imperial College London)

Coordinates: room 601D (tentative), CBPF. 30.08, 16h00

Abstract: How do we separate finite-sized effects and stochasticity from genuinely non-classical features in thermodynamics? In the past two decades, quantum information science has developed a range of results designed to perform precisely this type of separation. While these results were originally motivated by computational, information-processing and foundational concerns, more recently there is increasing work that applies such techniques to thermodynamics.
Here I will describe such approaches and discuss their strengths and weaknesses. I will argue that present approaches are poorly suited to handling such topics as quantum phase transitions, however I will also argue that such approaches do provide new perspectives on the interplay between coherence and time-dependent processes, shed light on the role of non-commutativity and emphasize structural relations between thermodynamics and the theory of entanglement.

BLOCO 2016

quantum Rio

———— Guest post by Jéssica O. de Almeida (UFRJ) e Gabriel D. Carvalho (CBPF) ————

bLOCO4_St
Em outubro de 2016 acontecerá o BLOCO (Bienal Latinoamericana de Óptica Cuántica O), uma conferência satélite ao Quantum Optics. Essa conferência é voltada para os alunos da América Latina, dando oportunidade para que esses apresentem seus trabalhos. Professores também estão convidados, porém só poderão assistir as palestras e apresentar pôster. O evento será realizado no CBPF nos dias 19-21/10.

O BLOCO tem como objetivo dar oportunidade de alunos de pós-graduação e jovens pesquisadores latinos americanos exporem trabalhos na forma de seminários e pôsteres, além de trocar experiências científicas na América Latina. Isso fortalece os laços da comunidade de óptica quântica da América Latina, algo essencial para aumentar, ainda mais, a relevância internacional de nossos grupos.

As inscrições estão abertas! Veja mais informações e se inscreva no site https://bloco2016.wordpress.com/.

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