Realization of an Error-Correcting Surface Code with Superconducting Qubits

Zhao, Youwei; Ye, Yangsen; Huang, He-Liang; Zhang, Yiming; Wu, Donghui; Guan, Huijie; Zhu, Qing–Ling; Wei, Zuolin; He, Tao; Cao, Shuchao; Chen, Fusheng; Chung, Taek‐Mo; Deng, Hui; Fan, Daojin; Gong, Ming; Guo, Cheng; Guo, Shaojun; Han, Lianchen; Li, Na; Li, Shaowei; Li, Yuan; Liang, Futian; Lin, Jin; Qian, Haoran; Rong, Hao; Su, Hong; Sun, Lihua; Wang, Shiyu; Wu, Yulin; Xu, Yu; Ying, Chong; Yu, Jiabing; Zha, Chen; Zhang, Kaili; Huo, Yongheng; Lu, Chao‐Yang; Peng, Cheng-Zhi; Zhu, Xiaobo; Pan, Jian-Wei

doi:10.1103/physrevlett.129.030501

Cited by 139 publications

(63 citation statements)

References 40 publications

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“…3 The QPE-based full-CI is very powerful and exponential speedup against its classical counterpart is guaranteed, but the quantum circuit for the QPE-based full-CI is so deep that it is quite difficult to obtain meaningful results unless quantum error correction code is implemented and fault-tolerant quantum computing is realized. Note that experimental demonstrations of quantum error correction have been reported recently, 4–6 but the number of available logical qubits is still too small for practical purposes.…”

Section: Introductionmentioning

confidence: 99%

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C_2v quasi-reaction pathway of beryllium insertion into a H₂ molecule

Sugisaki

Kato

Minato

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C_2v quasi-reaction pathway of beryllium insertion into a H₂ molecule

Sugisaki

Kato

Minato

et al. 2022

Phys. Chem. Chem. Phys.

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“…With the recent demonstrations of quantum error correction [1][2][3][4], superconducting circuits are one of the leading platforms towards the realization of a fault-tolerant quantum computer [5][6][7]. However, despite the remarkable progress, achieving fast and high-fidelity single-shot readout of the qubits' states remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2022

Preprint

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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 effectively increases the energy-relaxation time, 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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“…Qubit readout is generally required to meet the QND requirement [11][12][13][14][15][16][17]. Besides, the QND nature of a measurement is essential in repetitive quantum error correction [18][19][20][21][22][23][24], reducing measurement-induced state mixing error [25], and heralded state preparation [26].…”

Section: Introductionmentioning

confidence: 99%

Efficient characterization of quantum nondemolition qubit readout

Wang¹,

Cao²

2022

Preprint

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We study the quantitative characterization of the performance of qubit measurements in this paper. In particular, the back-action evading nature of quantum nondemolition (QND) readout of qubits is fully quantified by quantum trace distance. Only computational basis states are necessary to be taken into consideration. Most importantly, we propose an experimentally efficient method to evaluate the QND fidelity based on the classical trace distance, which uses an experimental scheme with two consecutive measurements. The three key quantifiers of a measurement, i.e., QND fidelity, readout fidelity, and projectivity, can be derived directly from the same experimental scheme. Besides, we present the relationships among these three factors. Theoretical simulation results for the dispersive readout of superconducting qubits show the validity of the proposed QND fidelity. Efficient quantification of measurement performance is of practical significance for the diagnosis, performance improvement, and design of measurement apparatuses.

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Realization of an Error-Correcting Surface Code with Superconducting Qubits

Cited by 139 publications

References 40 publications

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C_2v quasi-reaction pathway of beryllium insertion into a H₂ molecule

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C_2v quasi-reaction pathway of beryllium insertion into a H₂ molecule

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

Efficient characterization of quantum nondemolition qubit readout

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Realization of an Error-Correcting Surface Code with Superconducting Qubits

Cited by 139 publications

References 40 publications

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C2v quasi-reaction pathway of beryllium insertion into a H2 molecule

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C2v quasi-reaction pathway of beryllium insertion into a H2 molecule

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

Efficient characterization of quantum nondemolition qubit readout

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Product

Resources

About

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C_2v quasi-reaction pathway of beryllium insertion into a H₂ molecule

Variational quantum eigensolver simulations with the multireference unitary coupled cluster ansatz: a case study of the C_2v quasi-reaction pathway of beryllium insertion into a H₂ molecule