Transmon qubit readout fidelity at the threshold for quantum error correction without a quantum-limited amplifier

Chen, Liangyu; Li, Hang-Xi; Lu, Yong; Warren, Christopher W.; Križan, Christian J.; Kosen, Sandoko; Rommel, Marcus; Ahmed, Shahnawaz; Osman, Amr; Biznárová, Janka; Fadavi Roudsari, Anita; Lienhard, Benjamin; Caputo, Marco; Grigoras, Kestutis; Grönberg, Leif; Govenius, Joonas; Kockum, Anton Frisk; Delsing, Per; Bylander, Jonas; Tancredi, Giovanna

doi:10.1038/s41534-023-00689-6

Title: Transmon qubit readout fidelity at the threshold for quantum error correction without a quantum-limited amplifier

Journal Article · Thu Mar 16 04:00:00 UTC 2023 · npj Quantum Information

DOI: https://doi.org/10.1038/s41534-023-00689-6 · OSTI ID:1961891

;

; Lu, Yong;

;

; Rommel, Marcus; Ahmed, Shahnawaz;

; Biznárová, Janka;

;

; Caputo, Marco; Grigoras, Kestutis; Grönberg, Leif; Govenius, Joonas; Kockum, Anton Frisk;

;

Abstract High-fidelity and rapid readout of a qubit state is key to quantum computing and communication, and it is a prerequisite for quantum error correction. We present a readout scheme for superconducting qubits that combines two microwave techniques: applying a shelving technique to the qubit that reduces the contribution of decay error during readout, and a two-tone excitation of the readout resonator to distinguish among qubit populations in higher energy levels. Using a machine-learning algorithm to post-process the two-tone measurement results further improves the qubit-state assignment fidelity. We perform single-shot frequency-multiplexed qubit readout, with a 140 ns readout time, and demonstrate 99.5% assignment fidelity for two-state readout and 96.9% for three-state readout–without using a quantum-limited amplifier.

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Sponsoring Organization:: USDOE

OSTI ID:: 1961891

Journal Information:: npj Quantum Information, Journal Name: npj Quantum Information Journal Issue: 1 Vol. 9; ISSN 2056-6387

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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