Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 17: Superconductivity: Qubits II
TT 17.2: Talk
Monday, March 12, 2018, 15:15–15:30, H 2053
FPGA-based Quantum Feedback for Superconducting Qubits — •Richard Gebauer1,2, Nick Karcher1, Martin Weides2, Oliver Sander1, Alexey V. Ustinov2, and Marc Weber1 — 1Institut für Prozessdatenverarbeitung und Elektronik, KIT — 2Physikalisches Institut, KIT
A typical measurement setup for superconducting qubits consists of arbitrary waveform generators, signal recorders and vector network analyzers. Although sufficient for simple experiments, its applicability is limited due to long data communication delays, poor scalability and static pulse sequences. A faster and more flexible solution for qubit readout and control is FPGA-based custom hardware. It not only dramatically reduces costs and space requirements but also simplifies measurements and enables customized control schemes like quantum feedback where a low response time is critical.
We implemented an FPGA design for experiments with superconducting qubits which also enables fast feedback loops to control qubits depending on their measured state. Thus, it provides the basis for experiments and algorithms like quantum error correction or active reset. While typically the signal-to-noise ratio is improved by averaging, feedback loops require single shot measurements. Therefore, we employ a Josephson parametric amplifier with its superior noise characteristics. In the current state of development, we demonstrate arbitrary qubit rotations around X and Y axis. Furthermore, we can perform all standard measurements for qubit characterization using an FPGA and will present first results on implementing quantum feedback.