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Q: Fachverband Quantenoptik und Photonik

Q 23: Quantum Information: Concepts and Methods IV

Q 23.5: Talk

Tuesday, March 7, 2017, 15:30–15:45, P 2

Wigner tomography of operators in multi-qubit systems — •David Leiner, Robert Zeier, and Steffen J. Glaser — Department Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany

Arbitrary quantum-mechanical operators of a coupled multi-qubit system can be visualized using a Wigner-type representation composed of multiple spherical functions [1]. Building on this approach, we develop a general methodology to experimentally measure these spherical functions. The spherical functions are recovered by computing expectation values of axial spherical tensor operators rotated for a discrete set of angles. Experimental results using nuclear magnetic resonance spectroscopy are presented and visualized for up to three qubits.

[1] A. Garon, R. Zeier, and S. J. Glaser, Physical Review A, 91(4):042122, 2015