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[16:00-17:00] MST colloquium
- Description:
- Monday April 23, 2018
Speaker: Prof. Dimitris G. Angelakis
Affiliation: School of Electronic and Computer Engineering, Technical University of Crete and
Centre for Quantum Technologies, National University of Singapore
Title: Quantum simulators with light: Merging quantum optics to condensed matter for quantum technologies
Location: Computer Science Department, room A115 (ground floor), Voutes
Time: 16:00
Language: English
Abstract :
Classical computers require enormous computing power and memory to simulate even the most modest quantum systems. That makes it difficult
to model, for example, why certain materials are insulators and others are conductors or even superconductors. R. Feynman had grasped this
since the 1980s and suggested to use instead another more controllable and perhaps artificial quantum system as a "quantum computer" or
specifically in this case a "quantum simulator".
Working examples of quantum simulators today include extremely cold atoms trapped with lasers and magnetic fields and ions in electromagnetic traps. Photons and polaritons in light-matter systems have also recently emerged as a promising avenue especially for simulating out of equilibrium many-body phenomena in a natural
driven-dissipative setting.
I will briefly review in non-specialist terms the main results in this area including the early ideas on realizing Mott insulators, Fractional Hall states and Luttinger liquids with photons [1,2,3]. After that I
will present in more detail a recent experiment realizing the Hoeftstaedter butterfly and the many-body localization (MBL) transition using interacting photons in the latest superconducting quantum chip of
Google [4]. A simple method to study the energy-levels-and their statistics - of many-body quantum systems as they udergo the ergodic to
the MBL transition, was proposed and implemented. The formation of a mobility edge of an energy band was observed and its shrinkage with disorder toward the center of the bands was measured.
Beyond the applications in understanding fundamental physics, the potential impact of quantum simulators in different areas of quantum and nano technology, material science as well as machine learning and big data processing will be touched upon.
References
1. D.G. Angelakis and C. Noh “Many-body physics and quantum simulations
with light” Report of Progress in Physics, 80 016401 (2016)
2. "Quantum Simulations with Photons and Polaritons: Merging Quantum
Optics with Condensed Matter Physics" by D.G. Angelakis (ed), Quantum
Science and Technology Series, Springer, 2017, ISBN 978-3-319-52023-0.
3. P. Roushan, C. Neill, J. Tangpanitanon, V.M. Bastidas,…, H. Neven, D.
G. Angelakis, J. Martinis, “Spectral signatures of many-body
localization with interacting photons” Science, 358, I6367, 2017
Host: Ioannis Remediakis 4250
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April 2018
