IBM Quantum Seminar Series: Algebraic Techniques for Dealing with Difficult Operators in Quantum Chemistry on a Quantum Computer
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Speakers: Aleks Lasek & Florian Kranzl
Host: Olivia Lanes, PhD.
Abstract:
Quantum simulators have recently enabled experimental observations of quantum many-body systems’ internal thermalisation. Often, the global energy and particle number are conserved, and the system is prepared with a well-defined particle number—in a microcanonical subspace. However, quantum evolution can also conserve quantities, or charges, that fail to commute with each other. Noncommuting charges have recently emerged as a subfield at the intersection of quantum thermodynamics and quantum information. We initiate the experimental testing of its predictions, with a trapped-ion simulator. We prepare 6–15 spins in an approximate microcanonical subspace, a generalisation of the microcanonical subspace for accommodating noncommuting charges, which cannot necessarily have well-defined nontrivial values simultaneously. The noncommuting charges are the three spin components. We simulate a Heisenberg evolution using laser-induced entangling interactions and collective spin rotations. We report the first experimental observation of a novel non-Abelian thermal state, predicted by quantum thermodynamics. We observe reduced many-body thermalization in the presence of noncommuting charges. Quantum non-commutation effects are detectable and significant for relatively large realistic systems, despite decoherence. This work initiates the experimental testing of a subfield that has so far remained theoretical.
Bios:
Aleksander Lasek:
Aleks is a postdoc at QuICS and University of Maryland. After finishing his PhD in Cambridge, UK, supervised by Crispin Barnes, he moved to Maryland to work on quantum thermodynamics with Nicole Yunger-Halpern. He has developed a GPU-accelerated quantum simulator during his doctorate, and is interested in quantum computing, thermodynamics, information, and numerical simulations.
Florian Kranzl:
2017: Obtained MSc at Univ. Innsbruck, Austria in the group of Prof. Rainer Blatt, working at the fiber-cavity experiment of Prof. Tracy Northup on the characterization of fiber-based Fabry-Perot resonators
2017 - 2019: Working in industry on compact nanosecond Q-switched lasers
2019 - present: Working as a PhD student in the group of Prof. Rainer Blatt, working at the quantum simulation experiment of Christian Roos on quantum simulations with long strings of up to 50 individually addressable Ca40 ions.
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The Qiskit Seminar Series is a deep dive into various academic and research topics within the quantum community. It will feature community members and leaders every Friday, 12 PM EDT.
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