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Rapid High-Fidelity Multiplexed Readout of Superconducting Qubits

Christian Kraglund Andersen, Johannes Heinsoo, Ants Remm +8 more

Bulletin of the American Physical SocietyMar 5, 20182 citations

Fast Microwave-free State Preparation and Measurement of Superconducting Qubits

R. Abraham, F. Amet, P. Anderson +212 more

Fast, high-fidelity, scalable state preparation and measurement is critical to the realization of a quantum computing system. The state-of-the-art methods for preparation and readout of superconducting qubits require finely tuned microwave signals and ~100 ns of measurement time, which are major obstacles to the scalability and performance of superconducting quantum computers. Here, we have demonstrated novel, microwave-free methods for both preparation and readout of superconducting qubits with >99% fidelity in only 10 ns for either operation while maintaining qubit coherence. This technology is compatible with scalable superconducting digital control systems, and using quantum flux parametrons for amplification, we demonstrated full quantum-to-digital conversion in only 15 ns, which is an order of magnitude faster than state-of-the-art microwave-based techniques.Fast, high-fidelity, scalable state preparation and measurement is critical to the realization of a quantum computing system. The state-of-the-art methods for preparation and readout of superconducting qubits require finely tuned microwave signals and ~100 ns of measurement time, which are major obstacles to the scalability and performance of superconducting quantum computers. Here, we have demonstrated novel, microwave-free methods for both preparation and readout of superconducting qubits with >99% fidelity in only 10 ns for either operation while maintaining qubit coherence. This technology is compatible with scalable superconducting digital control systems, and using quantum flux parametrons for amplification, we demonstrated full quantum-to-digital conversion in only 15 ns, which is an order of magnitude faster than state-of-the-art microwave-based techniques.

quant-pharXiv:2609.01334Sep 2, 20260 citations

Fast high fidelity quantum non-demolition superconducting qubit readout

Rémy Dassonneville, Thomas Ramos, Vladimir Milchakov +12 more

Bulletin of the American Physical SocietyMar 5, 20200 citations

Heralded State Preparation in a Superconducting Qubit

Jedediah E Johnson, Chris Macklin, D. H. Slichter +4 more

We demonstrate high-fidelity, quantum nondemolition, single-shot readout of a superconducting flux qubit in which the pointer state distributions can be resolved to below one part in 1000. In the weak excitation regime, continuous measurement permits the use of heralding to ensure initialization to a fiducial state, such as the ground state. This procedure boosts readout fidelity to 93.9% by suppressing errors due to spurious thermal population. Furthermore, heralding potentially enables a simple, fast qubit reset protocol without changing the system parameters to induce Purcell relaxation.We demonstrate high-fidelity, quantum nondemolition, single-shot readout of a superconducting flux qubit in which the pointer state distributions can be resolved to below one part in 1000. In the weak excitation regime, continuous measurement permits the use of heralding to ensure initialization to a fiducial state, such as the ground state. This procedure boosts readout fidelity to 93.9% by suppressing errors due to spurious thermal population. Furthermore, heralding potentially enables a simple, fast qubit reset protocol without changing the system parameters to induce Purcell relaxation.

arXiv:1202.5541Physical Review LettersAug 3, 2012181 citations

Readout fidelity enhancement via transient response exclusion in superconducting qubits

Wei-En Lin, Yung‐Fu Chen

Physical Review AFeb 27, 20260 citations

Preparation and Readout Methods for Noise Protected Superconducting Qubits

David Ferguson, Andy C. Y. Li, Jens Koch

Bulletin of the American Physical SocietyMar 8, 20180 citations

High fidelity readout of a superconducting qubit using heralded state preparation

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