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

Author:

Gunyhó András M.ORCID,Kundu SumanORCID,Ma Jian,Liu WeiORCID,Niemelä Sakari,Catto Giacomo,Vadimov VasiliiORCID,Vesterinen VisaORCID,Singh PriyankORCID,Chen QimingORCID,Möttönen MikkoORCID

Abstract

AbstractMeasuring 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.

Publisher

Springer Science and Business Media LLC

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Inherent Thermal-Noise Problem in Addressing Qubits;PRX Quantum;2024-07-02

2. Measuring qubits with thermometers;Nature Electronics;2024-04-25

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