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14 September 2020 – 17 September 2020 OSA Virtual Event - Eastern Daylight Time (UTC - 04:00)

Ignacio Cirac

Max Planck Institute of Quantum Optics

Quantum Algorithms for Finite Energies and Temperatures

I will introduce two quantum algorithms to determine finite energy and temperature properties of many-body quantum systems [1]. The first one obtains the desired result in polynomial time in the number of qubits. The other one uses the quantum computer as a subroutine for a Monte Carlo method and avoids the so-called sign problem. Both of them can be used with NISQ and analog quantum simulators. [1] S. Lu, M.C. Banuls, and J.I. Cirac, arXiv:2006.03032

About the Speaker

Born in Manresa, Spain. In 1988, he graduated in Theoretical Physics from the Complutense University, Madrid, and gained his PhD in 1991. Between 1991 and 1996, he was Associate Professor at the University of Castilla-La Mancha. From 1996 until 2001 he was Professor of Theoretical Physics at the University of Innsbruck, Austria. Since 2001 he is the director of the Theory Division at the Max Planck Institute of Quantum Optics and Honorary Professor at the Technical University of Munich. The focus of his research work is the quantum theory of information and quantum optics. With his colleague Peter Zoller, he made the first proposals to build quantum computers, quantum simulators, and quantum repeaters using atoms, ions, photons and other physical systems. He also introduced basic concepts and techniques in quantum information theory and, in particular, in entanglement theory. In the last years, he introduced the tensor networks states called PEPS, developed their theory, and related the entanglement of a many-body quantum system with the possibility of describing it efficiently.