Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 54: Quantum Information: Quantum Computing and Communication II

Q 54.2: Vortrag

Donnerstag, 3. März 2016, 14:45–15:00, e214

Randomized Benchmarking protocol accounting for leakage and gate dependent errors — •Tobias Chasseur and Frank Wilhelm — Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany

In the wake of recent advances in experimental implementations of quantum gates on physical qubits characterizing the fidelity of those gates efficiently and accurately becomes increasingly important. The Randomized Benchmarking protocol allows to do so for specific sets of quantum gates such as the Clifford group in a way that is scalable in the number of qubits and robust against state preparation and measurements errors. It however suffers from several assumptions and restrictions which are typically not given for physical systems. We investigate the effect of leakage errors induced from an additional level per physical qubit on Randomized Benchmarking and provide a modified protocol that allows to derive reliable estimates for the average error per gate in their presence. Our protocol allows for gate dependent error channels without the unphysical restriction to small perturbations. We show that our protocol is compatible with Interleaved Randomized Benchmarking and expand to benchmarking of arbitrary gates. This setting is relevant for superconducting transmon qubits, among other systems.