Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Quantum Information (Concepts and Methods) III

Q 16.1: Talk

Tuesday, March 10, 2020, 14:00–14:15, e001

Wigner Process Tomography of Unknown Quantum Propagators — •Amit Devra and Steffen J. Glaser — Technische Universität München, Department Chemie, Lichtenbergstrasse 4, 85747 Garching, Germany

We study the tomography of unknown propagators for the spin system in the context of finite-dimensional Wigner representations, which completely characterize and visualize operators using shapes assembled from linear combinations of spherical harmonics. These shapes can be experimentally recovered by measuring the expectation values of the rotated axial tensor operator. Recent works show the general methodology to experimentally recover the shapes for density matrices (ρ) and known quantum propagators (U). This work extends the tomography approach for the unknown propagators. The approach is experimentally demonstrated for one-qubit quantum gates using NMR spectroscopy.