QRC Seminar Series - Prof. Dario Poletti

May 06, 2024
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Prof. Dario Poletti

Head of Cluster, Science, Mathematics and Technology (SMT) Cluster

Programme Director, SUTD Honours and Research Programme (SHARP)

Singapore University of Technology and Design (SUTD) 

6th May 2024 - 5:00pm - 6:00pm (GST)

Location: Auditorium 1. 

Title:Emergence of steady quantum transport in a superconducting processor 

Non-equilibrium quantum transport is crucial to technological advances ranging from nanoelectronics to thermal management. In essence, it deals with the coherent transfer of energy and (quasi-)particles through quantum channels between thermodynamic baths. 

A complete understanding of quantum transport thus requires the ability to simulate and probe macroscopic and microscopic physics on equal footing. Using a superconducting quantum processor, we demonstrate the emergence of non-equilibrium steady quantum transport by emulating the baths with qubit ladders and realizing steady particle currents between the baths.

 We experimentally show that the currents are independent of the microscopic details of bath initialization, and their temporal fluctuations decrease rapidly with the size of the baths, emulating those predicted by thermodynamic baths. The above characteristics are experimental evidence of pure-state statistical mechanics and prethermalization in non-equilibrium many-body quantum systems. Furthermore, by utilizing precise controls and measurements with single-site resolution, we demonstrate the capability to tune steady currents by manipulating the macroscopic properties of the baths, including filling and spectral properties. Our investigation paves the way for a new generation of experimental exploration of non-equilibrium quantum transport in strongly correlated quantum matter.

Bio:Associate Professor Dario Poletti is the Head for the Science, Mathematics and Technology (SMT) cluster at SUTD and he is also concurrently the Programme Director for the SUTD Honours and Research Programme (SHARP). Being one of the early faculty members who joined our Freshmore curriculum team in July 2012, Dario has actively contributed to SUTD’s pedagogy as well as research. In 2015, he was named in Asia Pacific MIT Technology Review’s Innovators under 35 list, and in 2017 the IoP Outstanding Referee Award for New Journal of Physics. Dario obtained his joint PhD in Physics from the National University of Singapore and the Australian National University, for which he received the Medal of Material Research Society of Singapore for the best PhD thesis in NUS Physics Department in 2010. Before that he earned a Master of Engineering (Nuclear Engineering) from Politecnico di Milano and Master of Engineer (Applied Physics) from Ecole Centrale Paris. His research areas focus on Complex Quantum Systems, including the topics of Quantum Transport, Quantum Thermodynamics, Quantum Chaos, Quantum Computing, and development of advanced classical numerical methods to study these systems. He has more than 90 publications appearing in journals including Nature, Nature Quantum Information, Physical Review Letters and Review of Modern Physics.