State preparation of a fluxonium qubit with feedback from a custom FPGA-based platform
| Autor: | Marc H. Weber, Alexey V. Ustinov, Nicolas Roch, Ivan Takmakov, Lukas Grünhaupt, Daria Gusenkova, Patrick Winkel, Wolfgang Wernsdorfer, Richard Gebauer, Nick Karcher, Oliver Sander, Martin Weides, Martin Spiecker, Ioan Pop, Luca Planat |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Quantum Physics
business.industry Computer science Condensed Matter - Superconductivity Latency (audio) Initialization FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superconductivity (cond-mat.supr-con) Gate array Qubit 0103 physical sciences State (computer science) Hardware_ARITHMETICANDLOGICSTRUCTURES 010306 general physics 0210 nano-technology business Field-programmable gate array Quantum Physics (quant-ph) Reset (computing) Computer hardware Energy (signal processing) |
| ISSN: | 0094-243X |
| Popis: | We developed a versatile integrated control and readout instrument for experiments with superconducting quantum bits (qubits), based on a field-programmable gate array (FPGA) platform. Using this platform, we perform measurement-based, closed-loop feedback operations with $428 \, \mathrm{ns}$ platform latency. The feedback capability is instrumental in realizing active reset initialization of the qubit into the ground state in a time much shorter than its energy relaxation time $T_1$. We show experimental results demonstrating reset of a fluxonium qubit with $99.4\,\%$ fidelity, using a readout-and-drive pulse sequence approximately $1.5 \, \mathrm{\mu s}$ long. Compared to passive ground state initialization through thermalization, with the time constant given by $T_1 = ~ 80 \, \mathrm{\mu s}$, the use of the FPGA-based platform allows us to improve both the fidelity and the time of the qubit initialization by an order of magnitude. Comment: 3 pages, 2 figures. The following article has been submitted to the AIP Conference Proceedings of the Fifth International Conference on Quantum Technologies (ICQT-2019) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|