Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Superconducting Qubits (joint session QI/TT)

TT 41.10: Talk

Wednesday, March 20, 2024, 12:00–12:15, HFT-FT 131

Improving Transmon Qudit Measurement on IBM Quantum Hardware — •Tobias Kehrer, Tobias Nadolny, and Christoph Bruder — Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

The Hilbert space of a physical qubit typically features more than two energy levels. Using states outside the qubit subspace can provide advantages in quantum computation. To benefit from these advantages, individual states of the d-dimensional qudit Hilbert space have to be discriminated properly during readout. In this contribution (arXiv:2307.13504), we propose and analyze two measurement strategies that improve the distinguishability of transmon qudit states. Both strategies aim to minimize drive-frequency dependent assignment errors of qudit states. Based on a model describing the readout of IBM Quantum devices, these strategies are compared to the default measurement. In addition, we employ higher-order X-gates that make use of two-photon transitions for qudit state preparation.

Keywords: Qudits; Quantum Computation; Quantum Gates; Superconducting Qubits