Quantum Optics and Information Group

Visitors

Thu, 03 Jul 2014 06:15:34 -0300

2013 Visitors

Dr. Stephen P. Walborn (UFRJ, Brazil)
Dr. Paulo H. Souto Ribeiro (UFRJ, Brazil)
Dr. Fabrício Toscano (UFRJ, Brazil)
Dr. Roberto Sarthour (CBPF, Brazil)
Dr. Gerardo Adesso (Notthingam University, UK)
Dr. Daniel Terno (Macquarie University, Australia)
Dr. André Xuereb (Queen's University, UK)
Dr. Kavan Modi (Oxford University, UK)
Dr. John Goold (ICTP, Italy)

Original

Workshop on quantum information and thermodynamics

Thu, 01 May 2014 11:44:05 -0300

Original

News

Sat, 29 Mar 2014 19:37:10 -0300

A New Lab - We are starting to implement the Quantum Optics laboratory, based on the production of twin photons by spontaneous parametric down conversion. We intend to work with continuous as well as discrete quantum degrees of freedom of the light, focusing on quantum correlations.

Recent Publications

Localized modes in quasi-two-dimensional Bose-Einstein condensates with spin-orbit and Rabi couplings

by Luca Salasnich, Wesley B. Cardoso, Boris A. Malomed

We consider a two-component pancake-shaped, i.e., effectively two-dimensional (2D), Bose-Einstein condensate coupled by the spin-orbit (SO) and Rabi terms. The SO coupling adopted here is of the mixed Rashba-Dresselhaus type. For this configuration, we derive a system of two 2D nonpolynomial Schrödinger equations (NPSEs), for both attractive and repulsive interatomic interactions. In the low- and high-density limits, the system amounts to previously known models, namely, the usual 2D Gross-Pitaevskii equation, or the Schrödinger equation with the nonlinearity of power 7/3. We present simple approximate localized solutions, obtained by treating the SO and Rabi terms as perturbations. Localized solutions of the full NPSE system are obtained in a numerical form. Remarkably, in the case of the attractive nonlinearity acting in free space (i.e., without any 2D trapping potential), we find parameter regions where the SO and Rabi couplings make 2D fundamental solitons dynamically stable. Read more here.

Quantum control in Foundational Experiments

by Lucas C. Céleri, Rafael M. Gomes, Radu Ionicioiu, Thomas Jennewein, Robert B. Mann and Daniel R. Terno.

In this article, published online in Foundations of Physics, the authors describe a new class of experiments designed to probe the foundations of quantum mechanics. Using quantum controlling devices, it was shown how to attain a freedom in temporal ordering of the control and detection of various phenomena. Considering the wave-particle duality in the context of quantum-controlled and the entanglement-assisted delayed-choice experiments, a new interpretation of Bohr's complementarity principle raised. The discussion is then extended to the quantum-controlled CHSH experiment and to the measurement of a photon’s transversal position and momentum in a single experimental setup. Read more here.

Original

Home

Fri, 25 Jan 2013 17:05:08 -0200

The Quantum Optics and Information Group of Goiânia is a research team of the Institute of Physics of Federal University of Goiás (Brazil) that undertakes research in both theoretical and experimental aspects of quantum mechanics and advanced quantum technologies with future applications in metrology, communication, and computation. Our group originated from the Quantum Optics Group, founded in 1999 by Professor Basilio Baseia, that was primarily focused on the preparation, the study of the properties and the applications of nonclassical states of the electromagnectic field in travelling waves or inside a superconducting cavity. With the incorporation of new researchers to the group: Ardiley T. Avelar (2006 ), Norton G. de Almeida (2009), Wesley B. Cardoso (2010), Lucas C. Céleri (2012) and Rafael M. Gomes (2012), the research lines was greatly expanded including, among other things, the foundations of quantum mechanics, quantum mechanics of open system, optical solitons and optical communications, nonlinear dynamics in Bose-Einstein condensates, quantum (relativistic) thermodynamics, quantum (relativistic) information and experimental quantum optics.

Institute of Physics

Federal University of Goiás

Goiânia - GO - Brazil

Who will be visiting us this year

Caslav Brukner (University of Vienna) - From 09th - 13th June
Marcelo Terra Cunha (UFMG) - From 09th - 13th June
Diogo de Oliveira Soares Pinto (IFSC - USP) - From 08th - 12th June
Diego Paiva Pires (IFSC - USP) - From 08th - 12th June
Miled H. Y. Moussa (IFSC) - From 27th - 28th January
Gentil de Morais Neto (IFSC) - From 27th to 29th January
Fabrício Toscano (UFRJ) - From 02nd to 04th February

Interesting Links

Join us

Fri, 25 Jan 2013 17:00:28 -0200

Open Positions

If you want to join the QOI group as a graduate student, there are two annual examinations selection, usually in February and July. For more information about the exames or available fellowships, please contact one of the group members. Previous contact with the future advisor is not necessary, but highly desirable.

Post-doc positions are always open, without the need for an admission exam. Just contact one of the members of the group for the definition of a project and the application for a scholarship.

If you have any doubt or suggestion, please don't hexitate in contact us.

Permanent Positions

Due to Brazilian law, the hiring of permanent members can only occur through a public concourse. At the moment there are no open calls.

Original

Events

Fri, 25 Jan 2013 17:00:13 -0200

Workshops and Conferences

Here we list all the workshops and conferences in which members of the group are involved.

29th June - 19th July - Quantum Science: Implementations (Benasque, Spain, 2014).
06th-10th September - International Iran Conference on Quantum Information (Kish Island, Iran, 2014).
27th-29th October - III Encontro de Física do Centro-Oeste (Cuiabá, Brazil, 2014).
24th-28th November - II Physics Meeting in Amazonia (Belém, Brazil, 2014).
05th December - O pote de ouro de Bell (Rio de Janeiro, Brrazil, 2014).
23th-27th February - Workshop on Quantum Information and Thermodynamics (São Paulo, Brazil, 2015).
09th-13th March - Quantum Many-Body Systems far from equilibrium: Quench dynamics, thermalisaition, and cold atoms (Stellenbosh, South Africa, 2015).
13th-17th July - Thermodynamics and nonlinear dynamics in the information age (Telluride, USA, 2015).
27th July - 01st August - Frontiers in quantum and mesoscopic thermodynamics (Prague, Czech Republic, 2015).

Talks
01/04 - 10:00 Dr. Gabriel Agullar (UFRJ).

15/05 - 10:00 Dr. Ruben Auccaise (UEPG).

Original

Publications

Fri, 25 Jan 2013 16:59:58 -0200

2014

N. G. de Almeida. Engineering the unitary charge conjugation operator of quantum field theory for particle-antiparticle using trapped ions and light fields in cavity QED. Read.
L. Salasnich, W. B. Cardoso and B. A. Malomed. Localized modes in quasi-two-dimensional Bose-Einstein condensates with spin-orbit and Rabi couplings. Read.
L. C. Céleri, R. M. Gomes, R. Ionicioiu, T. Jennewein, R. B. Mann and D. R. Terno. Quantum control in foundational experiments. Read.

K. Micadei, D. A. Rowlands, F. A. Pollock, L. C. Céleri, R. M. Serra and K. Modi. Coherent readout leads to quadratic noise reduction over adaptive readout in noisy quantum metrology. Read.

R. M. Gomes, W. B. Cardoso, A. T. Avelar and B. Baseia. A note on quantum teleportation without the Bell-state measurement in superconducting qubits. Read.

L. Calaça, A. T. Avelar, D. Bazeia and W. B. Cardoso. Modulation of localized solutions for the Schrödinger equation with logarithm nonlinearity. Read.

Wen-Chao Qiang and W. B. Cardoso. Entanglement of formation for qubit-qudit system using partition of qudit sytem into a set of qubit system. Read.

N. G. de Almeida, A. T. Avelar and W. B. Cardoso. A proposal to implement a quantum delayed choice experiment assisted by a cavity QED. Read.

H. L. C. Couto and W. B. Cardoso. Dark soliton in quasi-one-dimensional Bose-Einstein condensates with a Gaussian trap. Read.

2013

J. Maziero, R. Auccaise, L. C. Céleri, D. O. Soares-Pinto, E. R. de Azevedo, T. J. Bonagamba, R. S. Sarthour, I. S. Oliveira and R. M. Serra. Quantum discord in nuclear magnetic resonance systems at room temperature. Read.

K. Micadei, R. M. Serra and L. C. Céleri. Thermodynamic cost of acquiring information. Read.

W. B. Cardoso, J. Zeng, A. T. Avelar, D. Bazeia and B. A. Malomed. Bright solitons from the nonpolynomial Schrödinger equation with inhomogeneous defocusing nonlinearities. Read.

Original

Research

Fri, 25 Jan 2013 16:59:34 -0200

Quantum Information

Quantum Information is an extremely exciting area of contemporary physics that has attracted much attention in the last years. An increasing number of important results from both theoretical and experimental fields are changing our basic understand of physics, specially the foundations of quantum mechanics and thermodynamics. Beyond this, the applications of quantum information to technological developments allow us to dream about processing information at the quantum level.

Quantum Thermodynamics

Thermodynamics lies at the very basis of physics and the great social and technological improvement in human life brought by its development can hardly be quantified. Now, how can we extend, and until what level, the laws of macroscopic thermodynamics to the quantum world? Is that possible to do thermodynamics in small, out-of-equilibrium quantum systems? It seems that Quantum Information holds the key to answer such deep questions. This is the field of quantum thermodynamics.

Quantum Optics

The main goal of our research in quantum optics is to study processes of light-matter interaction aiming to develop protocols to achieve quantum teleportation, quantum states engineering, Hamiltonians engineering, quantum logic gates, among others. Also, we analyze the role of the losses during the whole protocols by means of phenomenological techniques aiming to simplify the estimative for the fidelities in these protocols. We are as well interested in the dynamics of quantum correlations and of the statistical properties of quantum states.

Individual research interests

Dr. Ardiley T. Avelar is interested in quantum optics, quantum information, relativistic quantum information, foundations of quantum mechanics, and classical and quantum field theory (with particular applications in BEC and optical fiber).

Prof. Basilio Baseia devotes his research on the study of new states of the light field with applications in quantum communication protocols.

Dr. Lucas C. Céleri's research is focused on the foundations of quantum mechanics and thermodynamics as seem from the quantum information lenses. The relations between relativity, thermodynamics and quantum mechanics are also of great interest. He is mainly a theoretical physicist, but also work with experimental physics, specially in nuclear magnetic resonance and quantum optics. Some basic questions in which he is interested is: Why quantum mechanics? What are the limits imposed by thermodynamics on information processing? Is it possible to understand gravity from the informational point of view? and so on...

Dr. Norton G. de Almeida has particular interest in foundations of quantum mechanics, specially on the incompatibility between hidden variable theories and quantum mechanics stemming from entanglement and/or quantum correlations.

Dr. Wesley Bueno Cardoso has been interested in research in the areas of quantum communication and in the dynamics of quantum systems such as Bose-Einstein condensates and those modeled by networks of coupled oscillators. The main points are: Quantum teleportation, implementation of quantum communication protocols, entanglement dynamics, open systems, Anderson localization, solitons, etc..

Original