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Fabrication and characterization of superconducting multiqubit device with niobium base layer 被引量:3
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作者 Feifan Su Zhaohua Yang +5 位作者 Shoukuan Zhao Haisheng Yan Ziting Wang Xiaohui Song Ye Tian Shiping Zhao 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期138-142,共5页
Superconducting transmon qubits are the leading platform in solid-state quantum computing and quantum simulation applications.In this work,we develop a fabrication process for the transmon multiqubit device with a nio... Superconducting transmon qubits are the leading platform in solid-state quantum computing and quantum simulation applications.In this work,we develop a fabrication process for the transmon multiqubit device with a niobium base layer,shadow-evaporated Josephson junctions,and airbridges across the qubit control lines to suppress crosstalk.Our results show that these multiqubit devices have well-characterized readout resonators,and that the energy relaxation and Ramsey(spin-echo)dephasing times are up to∼40µs and 14(47)µs,respectively.We perform single-qubit gate operations that demonstrate a maximum gate fidelity of 99.97%.In addition,two-qubit vacuum Rabi oscillations are measured to evaluate the coupling strength between qubits,and the crosstalk among qubits is found to be less than 1%with the fabricated airbridges.Further improvements in qubit coherence performance using this fabrication process are also discussed. 展开更多
关键词 superconducting quantum computing transmon qubit device fabrication CHARACTERIZATION
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Demonstration of quantum permutation parity determine algorithm in a superconducting qutrit
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作者 Kunzhe Dai Peng Zhao +3 位作者 Mengmeng Li Xinsheng Tan Haifeng Yu Yang Yu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第6期164-167,共4页
A quantum algorithm provides a new way in solving certain computing problems and usually faster than classical algorithms. Here we report an implementation of a quantum algorithm to determine the parity of permutation... A quantum algorithm provides a new way in solving certain computing problems and usually faster than classical algorithms. Here we report an implementation of a quantum algorithm to determine the parity of permutation in a single three-dimensional(3D) superconducting transmon qutrit system. The experiment shows the capacity to speed up in a qutrit,which can also be extended to a multi-level system for solving high-dimensional permutation parity determination problem. 展开更多
关键词 quantum algorithm QUTRIT superconducting quantum computing
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Superconducting quantum bits
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作者 刘伟洋 郑东宁 赵士平 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第2期184-194,共11页
Superconducting quantum bits (qubits) and circuits are the leading candidate for the implementation of solid-state quantum computation. They have also been widely used in a variety of studies of quantum physics, ato... Superconducting quantum bits (qubits) and circuits are the leading candidate for the implementation of solid-state quantum computation. They have also been widely used in a variety of studies of quantum physics, atomic physics, quantum optics, and quantum simulation. In this article, we will present an overview of the basic principles of the superconducting qubits, including the phase, flux, charge, and transmon (Xmon) qubits, and the progress achieved so far concerning the improvements of the device design and quantum coherence property. Experimental studies in various research fields using the superconducting qubits and circuits will be briefly reviewed. 展开更多
关键词 superconducting qubit superconducting quantum computing quantum physics quantum optics quantum simulation
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Entanglement Purification for Mixed Entangled Quantum Dot States via Superconducing Transmission Line Resonators 被引量:1
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作者 董萍 张刚 曹卓良 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第3期13-16,共4页
An entanglement purification protocol for mixed entangled states is presented via double quantum dot molecules inside a superconducing transmission line resonator (TLR). In the current scenario, coupling for arbitra... An entanglement purification protocol for mixed entangled states is presented via double quantum dot molecules inside a superconducing transmission line resonator (TLR). In the current scenario, coupling for arbitrary double quantum dot molecules can be tuned via the TLR in the large detuning region by controlling the qubit level splitting. The TLR is always empty and only virtually excited, so the interaction is insensitive to both the TLR decay and thermal field. Discussion about the feasibility of our scheme shows that the entanglement purification can be implemented with high fidelity and successful probability. 展开更多
关键词 Superconductivity Computational physics Surfaces interfaces and thin films Nanoscale science and low-D systems Quantum information and quantum mechanics
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Scheme for Generating Cluster States with Charge Qubits in a Cavity 被引量:1
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作者 宋克慧 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第12期16-19,共4页
Based on superconducting charge qubits (SCCQs) coupled to a single-mode microwave cavity, we propose a scheme for generating charge cluster states. For all SCCQs, the controlled gate voltages are all in their degene... Based on superconducting charge qubits (SCCQs) coupled to a single-mode microwave cavity, we propose a scheme for generating charge cluster states. For all SCCQs, the controlled gate voltages are all in their degeneracy points, the quantum information is encoded in two logic states of charge basis. The generation of the multi-qubit cluster state can be achieved step by step on a pair of nearest-neighbor qubits. Considering effective long-rang coupling, we provide an efficient way to one-step generating of a highly entangled cluster state, in which the qubit-qubit coupling is mediated by the cavity mode. Our quantum operations are insensitive to the initial state of the cavity mode by removing the influence of the cavity mode via the periodical evolution of the system. Thus, our operation may be against the decoherence from the cavity. 展开更多
关键词 Superconductivity Computational physics Quantum information and quantum mechanics
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Universal Quantum Cloning Machine in Circuit Quantum Electrodynamics
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作者 吕丹丹 路洪 +2 位作者 於亚飞 冯勋立 张智明 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第2期12-15,共4页
We propose a scheme for realizing the 1 → 2 universal quantum cloning machine (UQCM) with superconducting quantum interference device (SQUID) qubits in circuit quantum electrodynamics (circuit QED). In this sch... We propose a scheme for realizing the 1 → 2 universal quantum cloning machine (UQCM) with superconducting quantum interference device (SQUID) qubits in circuit quantum electrodynamics (circuit QED). In this scheme, in order to implement UQCM, we only need phase shift gate operation on SQUID qubits and the Raman transitions. The cavity number we need is only one. Thus our scheme is simple and has advantages in the experimental realization. Furthermore, both the cavity and the SQUID qubits are virtually excited, so the decoherence can be neglected. 展开更多
关键词 Superconductivity Computational physics Optics quantum optics and lasers Quantum information and quantum mechanics
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Quantum computational advantage via 60-qubit 24-cycle random circuit sampling 被引量:6
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作者 Qingling Zhua Sirui Cao +50 位作者 Fusheng Chen Ming-Cheng Chen Xiawei Chen Tung-Hsun Chung Hui Deng Yajie Du Daojin Fan Ming Gong Cheng Guo Chu Guo Shaojun Guo Lianchen Han Linyin Hong He-Liang Huang Yong-Heng Huo Liping Li Na Li Shaowei Li Yuan Li Futian Liang Chun Lin Jin Lin Haoran Qian Dan Qiao Hao Rong Hong Su Lihua Sun Liangyuan Wang Shiyu Wang Dachao Wu Yulin Wu Yu Xu Kai Yan Weifeng Yang Yang Yang Yangsen Ye Jianghan Yin Chong Ying Jiale Yu Chen Zha Cha Zhang Haibin Zhang Kaili Zhang Yiming Zhang Han Zhao Youwei Zhao Liang Zhou Chao-Yang Lu Cheng-Zhi Peng Xiaobo Zhu Jian-Wei Pan 《Science Bulletin》 SCIE EI CSCD 2022年第3期240-245,共6页
To ensure a long-term quantum computational advantage,the quantum hardware should be upgraded to withstand the competition of continuously improved classical algorithms and hardwares.Here,we demonstrate a superconduct... To ensure a long-term quantum computational advantage,the quantum hardware should be upgraded to withstand the competition of continuously improved classical algorithms and hardwares.Here,we demonstrate a superconducting quantum computing systems Zuchongzhi 2.1,which has 66 qubits in a two-dimensional array in a tunable coupler architecture.The readout fidelity of Zuchongzhi 2.1 is considerably improved to an average of 97.74%.The more powerful quantum processor enables us to achieve larger-scale random quantum circuit sampling,with a system scale of up to 60 qubits and 24 cycles,and fidelity of FXEB=(3·66±0·345)×10^(-4).The achieved sampling task is about 6 orders of magnitude more difficult than that of Sycamore[Nature 574,505(2019)]in the classic simulation,and 3 orders of magnitude more difficult than the sampling task on Zuchongzhi 2.0[arXiv:2106.14734(2021)].The time consumption of classically simulating random circuit sampling experiment using state-of-the-art classical algorithm and supercomputer is extended to tens of thousands of years(about 4·8×104years),while Zuchongzhi 2.1 only takes about 4.2 h,thereby significantly enhancing the quantum computational advantage. 展开更多
关键词 Quantum physics Quantum computation Quantum information superconducting quantum computing superconducting qubit
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