We are glad to announce a talk by Gianluca Oppo (University of Strathclyde) which will take place on May 12, at 15:00, in Sala Polvani. Here in the following the title and abstract:
Opto-mecahnics of cold atoms and Bose-Einstein Condensates
Gianluca Oppo, University of Strathclyde
We consider theoretically and experimentally the behaviour of cold or ultra-cold atoms interacting with a laser beam in an optical cavity or in a single-feedback mirror set-up. The optical nonlinearity is augmented by the presence of the dipole force where atoms tend to move towards minima or maxima of the light intensity depending on the the difference between their resonant frequency and the frequency of the laser light (opto-mechanics). We observe novel Turing patterns entirely due to opto-mechanic effects in a cloud of cold Rubidium atoms under the action of an input laser beam and a feedback mirror. The role of the (cold) temperature is essential in these experimental measures. We then generalise these spatial features to the case of cold atoms in a cavity where dissipative solitons appear in the atomic density as well as in the light intensity distribution.
When considering ultra-cold atomic gases (Bose-Einstein condensates) new quantum features appear in the form of a threshold for pattern formation in the atomic density driven by the Heisenberg
indetermination principle. We also show that conservative chaos occurs in spite of the presence of the external driving and energy dissipation from the cavity mirrors.
A conference devoted to Non Markovian quantum dynamics will take place from 24 to 28 August 2015 organized by S. Maniscalco, J. Piilo, V. Giovannetti and M. G. A. Paris.
The idea is to put together a limited number of theoreticians in a special environment to foster discussions and collaborations. The workshop is by invitation only and the number of participants will be about 50.
The workshop will take place at the Palazzone, a monumental villa owned by Scuola Normale and located in Cortona, Italy.
The workshop has been made possible by the support of Centro di ricerca matematica E. De Giorgi with contributions from Scuola Normale Superiore, University of Turku and University of Milan.
The conference webpage is users.unimi.it/cortona15.
The next Quantum Expo workshop, on the topic Quantum Information and Control, will be held on Wednesday, February 24, 2015 at the Physics Department of the University of Milan (Aula Polvani) at 11:00. Here is the program of the workshop:
11:00 Stefano Mancini (Università di Camerino)
Entanglement assisted feedback control
11:50 Young scientist seminar
Transport process and typicality of noisy quantum systems with discrete time
14:30 Marco G. Genoni (University College London)
Cooling and squeezing generation for a levitated nanosphere via time-continuous measurements
Download the poster with program and abstracts!
On January 30th, 2015, Claudia Benedetti defended her thesis Decoherence, non-Markovianity and quantum estimation in qubit systems subject to classical noise and thus obtained her PhD degree from the University of Milan.
We all congratulate with Claudia for this important achievement in her research career and we wish her all the best for the future. Well done Claudia!!!
The next Quantum Expo workshop, on the topic Quantum estimation with classical and nonclassical states, will be held on February 18, 2015 at the Physics Department of the University of Milan (Aula Polvani) at 11:00. The workshop will feature talks by Gerardo Adesso (University of Nottingham) and Daniel Braun (Universität Tübingen).
Download the poster with program and abstracts!
We are glad to announce that the next event in the series “Quantum Expo“, featuring a talk by Peppe Liberti, titled “Il racconto della scienza”, will be held on January 27, at 11:00 in Aula E.
VIEW THE POSTER
Our PhD student Marina Samoylova has been awarded a 2014 Optics and Photonics Education Scholarship by SPIE, the international society for optics and photonics. Her research interests are theoretical investigation of photonic band gaps in optical lattices and mode-locked Bloch oscillations in ring cavities filled with cold atoms. Congratulations, Marina! See also the SPIE press release.
Great news for AQM and the FIRB project “LiCHIS” – Stefano Olivares together with Dario Tamascelli (Department of Physics, University of Milan) received a one-year grant for the project “Generation, characterization and application of non-classical continuous-variable states for quantum information protocols” supported by the Department of Physics of the University of Milan through the “Sviluppo UniMi” plan.
The project aims to enhance a setup for the generation of squeezed sates of light, that is currently present in the Quantum Optics Laboratory at the Department of Physics, up to the application level in quantum information protocols. This will require theoretical, numerical and experimental efforts to reach the expected objectives. All members of the AQM group will be involved, but, among them, the synergy with Simone Cialdi that leads the Quantum Optics Laboratory will be one of the key ingredients for the success of the project.
Furthermore, as the third year of the “LiCHIS” project, coordinated by Stefano Olivares, is devoted to the advanced analysis of correlations in optical systems, the new grant will allow to extend the research to the field of continuous-variable non-classical states, such as the squeezed states, which are the building blocks to generate continuous-variable entangled states. This new opportunity (and challenge!) will indeed improve the final results of “LiCHIS”.
Another good news for AQM and “LiCHIS” project (FIRB 2010 – Futuro in Ricerca). A paper describing the first experimental realization of “quantum illumination”, proposed so far by S. Lloyd [Science 321, 1463–1465 (2008)], has been just published in PRL and received a comment on the journal Nature. The result has been achieved by the experimental Quantum Optics group at INRIM (L. Lopaeva, I. Ruo Berchera, I. Degiovanni, G. Brida) led by Marco Genovese and by our group at UniMi.
In brief, quantum illumination exploits quantum correlations (entanglement) in order to enhance the detection of a faint object in a high-intensity thermal background. The realization of the protocol has required not only experimental efforts, but also a thorough theoretical analysis to find the best scenario to implement the protocol taking into account the current technological resources.
The joint efforts by INRIM and UniMi have lead to a slightly different protocol with respect to the original one, but it has been proved for the first time that a quantum protocol can show clear advantages with respect to classical ones, i.e. based on classical correlations. Furthermore, it demonstrates that the common belief that the advantages of quantum technologies are hardly applicable in a real context, due to the fragility to noise and losses, is not general, thus challenging the prevalent paradigm and paving the way toward their practical application.
More details at http://prl.aps.org/abstract/PRL/v110/i15/e153603