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TT: Fachverband Tiefe Temperaturen

TT 42: Quantum Coherence, Quantum Information Systems 2

TT 42.10: Vortrag

Mittwoch, 13. März 2013, 17:45–18:00, H18

Making optimal control work for superconducting qubits — Daniel Egger¹, Fadi Abu Dagga¹, Daniel Sank², and •Frank K. Wilhelm^1,3 — ¹Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken — ²Physics Department, University of California, Santa Barbara, USA — ³IQC and Department of Physics and Astronomy, University of Waterloo, Canada

Optimal control is a powerful tool to find pulse sequences and shapes that implement quantum gates on given realistic hardware, such as superconducting qubits. For practical applicability, the intense filtering as well as the challenge of precise calibration need to be met. We illustrate this challenge along the example of the implementation of a controlled phase shift gate between transmon qubits coupled by a resonator. The pulse sequence reaches a high fidelity gate in short time but is highly sensitive to the characterization of the transmon frequencies. We show how a combination of robust optimal control, genetic algorithms, and plain debugging help meet these challenges.