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Curated by: Qiskit (180 videos)
Episode 166 Quantum computers are currenty available as noisy intermediate-scale quantum devices. These machines yield a useful environment for research on quantum systems and dynamics. Building on this opportunity, we investigate open-system dynamics that are simulated on a quantum computer by coupling a system of interest to an ancilla. After each interaction the ancilla is measured, and the sequence of measurements defines a quantum trajectory. Using a thermodynamic analogy, which identifies trajectories as microstates [1], we show how to bias the dynamics of the open system in order to enhance the probability of quantum trajectories with desired properties, e.g., particular measurement patterns or temporal correlations. We discuss how such a biased, generally non-Markovian, dynamics can be implemented on a unitary, gate-based quantum computer and show proof-of-principle results for small systems on the ibmq_jakarta machine [2]. We also illustrate how rare events can be accessed through biased quantum dynamics [3] and present some results on the study of temporal and spatial correlations in an open constrained spin system. [1] J. P. Garrahan and I. Lesanovsky, Thermodynamics of Quantum Jump Trajectories, Physical Review Letters 104, 160601 (2010) [2] M. Cech, I. Lesanovsky and F. Carollo, Thermodynamics of quantum trajectories on a quantum computer, Physical Review Letters 131, 120401 (2023) [3] F. Carollo, J. P. Garrahan, I. Lesanovsky and C. Perez-Espigares, Making rare events typical in Markovian open quantum systems, Physical Review A 98, 010103(R) (2018) Bio sketch ---------- 2006: PhD at the University of Heidelberg/Germany (Atomic physics of Rydberg atoms in strong magnetic fields), Supervisor: Prof. Peter Schmelcher 2006: PostDoc at Institute of Electronic Structure and Laser at Heraklion/Greece, Supervisor: Dr. Wolf von Klitzing 2007-2009: PostDoc at the University of Innsbruck/Austria, Supervisor: Prof. Peter Zoller 2009-2019: Lecturer, Reader, Professor at the University of Nottingham/UK since 2019: Professor at the University of Tübingen/Germany (Theoretical Atomic Phyiscs and Synthetic Quantum Systems)