Sumários
Exploring the interface between quantum physics and gravity in experiments
28 novembro 2014, 14:00 • Yasser Omar
Markus Aspelmeyer, University of Vienna
I will argue for and against possibilities to experimentally test the interface between quantum physics and gravity in a meaningful way. One promising route has been opened by massive mechanical objects that are now becoming available as new systems for quantum science. Devices currently under investigation cover a mass range of more than 17 orders of magnitude - from nanomechanical waveguides of some picogram to macroscopic, kilogram-weight mirrors of gravitational wave detectors. This provides access to a hitherto untested parameter regime of macroscopic quantum physics, eventually at the interface to gravity. My conclusion is therefore going to be an optimistic one.
Quantum Optomechanics: State of the Play, Challenges & Perspectives
28 novembro 2014, 10:00 • Yasser Omar
Markus Aspelmeyer (University of Vienna)
Quantum simulation with integrated photonics
21 novembro 2014, 14:00 • Yasser Omar
Fabio Sciarrino, Università di Roma La Sapienza
Integrated photonics circuits have a strong potential to perform quantum information processing. Indeed, the ability to manipulate quantum states of light by integrated devices may open new perspectives both for fundamental tests of quantum mechanics and for novel technological applications. Within this framework we have developed a directional coupler, fabricated by femtosecond laser waveguide writing, acting as an integrated beam splitter able to support polarization-encoded qubits. As following step we addressed the implementation of quantum walk. This represents one of the most promising resources for the simulation of physical quantum systems, and has also emerged as an alternative to the standard circuit model for quantum computing. Up to now the experimental implementations have been restricted to single particle quantum walk, while very recently the quantum walks of two identical phot ons have been reported. For the first time, we investigated how the particle statistics, either bosonic or fermionic, influences a two-particle discrete quantum walk. Such experiment has been realized by adopting two-photon entangled states and integrated photonic circuits. As following step we have exploited this technology to simulate the evolution for disordered quantum systems observing how the particle statistics influences Anderson localization. Finally we will discuss the perspectives of optical quantum simulation: the implementation of the boson sampling to demonstrate the computational capability of quantum systems and the development of integrated architecture with three-dimensional geometries.
Quantum Information Processing with Integrated Photonics
21 novembro 2014, 10:00 • Yasser Omar
Fabio Sciarrino (Università di Roma "La Sapienza")