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

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

doi:10.1038/s41534-023-00709-5

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Cited by 6 publications

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SFQ Circuits for Quantum Computing

Krylov,

Jabbari,

Friedman

2023

Single Flux Quantum Integrated Circuit Design

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SFQ Circuits for Quantum Computing

Krylov,

Jabbari,

Friedman

2023

Single Flux Quantum Integrated Circuit Design

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Single-shot readout of a superconducting qubit using a thermal detector

Gunyhó,

Kundu,

et al. 2024

Nat Electron

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Measuring the state of a qubit is a key fundamental operation of a quantum computer. High-fidelity single-shot readout of superconducting qubits can be achieved using parametric amplifiers at millikelvin temperatures. However, scaling parametric amplifiers beyond hundreds of qubits is challenging due to practical size and power limitations. Nanobolometers can, in contrast, offer scalability, sensitivity and speed suitable for qubit readout. Here we show that a bolometer can provide single-shot qubit readout with a readout duration of 13.9 μs and a single-shot fidelity of 0.618. The fidelity is mainly limited by the energy relaxation time of the qubit (28 μs), and a fidelity of 0.927 is found after removing errors arising from this relaxation. In the future, higher-fidelity single-shot readout may be achieved through improvements in chip design and experimental setup, as well as a change in the bolometer absorber material to reduce the readout time to the level of hundreds of nanoseconds and below.

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Search for QCD axion dark matter with transmon qubits and quantum circuit

Chen,

Fukuda,

Inada

et al. 2024

Phys. Rev. D

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We propose a direct axion dark matter (DM) search using superconducting transmon quantum bits (qubits) as quantum sensors. With an external magnetic field applied, axion DM generates an oscillating electric field, which causes the excitation of the qubit. Such an excitation can be regarded as a signal of the axion DM. We provide a theoretical consideration of the excitation process of the qubits, taking into account the effects of the shielding cavity surrounding the qubits, and estimate the signal rate for the axion DM detection. We also discuss the enhancement of the DM signal by using cavity resonance and entangled quantum sensors realized by a quantum circuit. Combining these two effects, we can reach the parameter region suggested by QCD axion models. Published by the American Physical Society 2024

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

Abstract: The HTML has been updated to include a corrected version of the Supplementary Information.

Cited by 6 publications

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SFQ Circuits for Quantum Computing

SFQ Circuits for Quantum Computing

Single-shot readout of a superconducting qubit using a thermal detector

Search for QCD axion dark matter with transmon qubits and quantum circuit

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