Entanglement Detection and Characterization of Topological States

拓扑态的纠缠检测和表征

• 批准号: 19F19326
• 负责人: NORI FRANCO
• 金额: $ 1.54万
• 依托单位: Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-11-08 至 2022-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19F19326/
• 关键词: multipartite; entanglement; quantum simulation; superconducting qubits; quantum simulator; superconducting; phase transition; non-Markovian; multichannels in diamond; information backflow; Multipartite; quantum Fisher; non-Markovianity; non-H

We studied several emergent phenomena in quantum many-body systems from the perspective of quantum information. We theoretically studied topological phases in perturbed toric codes using quantum Fisher information (QFI). We showed thermalization and disorder-assisted stabilization of topological order after a quantum quench. We studied the 2D toric code at finite temperatures and showed that topological order cannot survive. Using a 19-qubit superconducting (SC) circuit, we generated and characterized multi-qubit entangled states. With 10 qubits, we measured the nonlinear squeezing parameter that had never been measured before. With all 19 qubits, we observed a metrological gain of 9.89 dB over the standard quantum limit, indicating a high level of entanglement for quantum-enhanced estimation sensitivity. We employed a 1D 12-qubit SC circuit to identify regimes of strong and weak thermalization with different states. Using a ladder-type SC circuit, we simulated both the XX-ladder and XX-chain models. We signaled thermalization and information scrambling in the XX ladder, which are absent in the XX chain. We realized a deterministic one-way C-not gate and one-way X rotations on IBM’s quantum-computing platform. We used multipartite entanglement to detect dynamical phase transitions using 16 SC qubits. We demonstrated the engineering of multiple dissipative channels by controlling adjacent nuclear spins of a NV center and observed the QFI’s flows to and from the environment.

从量子信息的角度研究了量子多体系统中的几种涌现现象。利用量子Fisher信息理论研究了扰动环面码的拓扑相位。我们证明了量子猝灭后拓扑有序的热化和无序辅助稳定。我们研究了有限温度下的二维复曲面代码，并表明拓扑顺序不能生存。利用一个19量子比特的超导电路，制备了多量子比特纠缠态，并对其进行了表征。用10个量子比特，我们测量了以前从未测量过的非线性压缩参数。对于所有19个量子比特，我们观察到超过标准量子极限的9.89 dB的量子增益，这表明量子增强估计灵敏度的高水平纠缠。我们采用了一个一维12量子位SC电路来识别不同状态的强和弱热化机制。使用梯形SC电路，我们模拟了XX-阶梯和XX-链模型。我们在XX阶梯中发出热化和信息扰乱的信号，这在XX链中是不存在的。我们在IBM的量子计算平台上实现了确定性的单向C-not门和单向X旋转。我们使用多体纠缠来检测使用16 SC量子比特的动力学相变。我们通过控制NV中心的相邻核自旋展示了多个耗散通道的工程，并观察了QFI进出环境的流动。

项目成果

Deterministic one-way logic gates on a cloud quantum computer

• DOI: 10.1103/physreva.105.042610
• 发表时间: 2021-08
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Zhi-Peng Yang;Huan-Yu Ku;A. Baishya;Yu-Ran Zhang;A. F. Kockum;Yueh-Nan Chen;Fu-li Li;J. Tsai;F. Nori

Observing nonlinear spin squeezing and entanglement of non-Gaussian states with interconnected superconducting qubits

观察具有互连超导量子位的非高斯态的非线性自旋挤压和纠缠

• 发表时间: 2021
• 作者: Shao Lian-He;Zhang Yu-Ran;Luo Yu;Xi Zhengjun;Fei Shao-Ming;Yu-Ran Zhang
• 通讯作者: Yu-Ran Zhang

Discrete time crystal in a driven-dissipative Bose-Hubbard model with two-photon processes

具有双光子过程的驱动耗散 Bose-Hubbard 模型中的离散时间晶体

• DOI: 10.1103/physreva.105.013710
• 发表时间: 2022-01
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Liu Tong;Zhang Yu-Ran;Xu Kai;Cui Jian;Fan Heng
• 通讯作者: Fan Heng

Quantifying quantum non-Markovianity based on quantum coherence via skew information

通过偏斜信息基于量子相干性量化量子非马尔可夫性

• DOI: 10.1088/1612-202x/ab5fe3
• 发表时间: 2020
• 期刊: Laser Physics Letters
• 影响因子: 1.7
• 作者: Shao Lian-He;Zhang Yu-Ran;Luo Yu;Xi Zhengjun;Fei Shao-Ming
• 通讯作者: Fei Shao-Ming

Observation of Thermalization and Information Scrambling in a Superconducting Quantum Processor

超导量子处理器中热化和信息加扰的观察

• DOI: 10.1103/physrevlett.128.160502
• 发表时间: 2022
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Qingling Zhu;Zheng-Hang Sun;Ming Gong;Fusheng Chen;Yu-Ran Zhang;Yulin Wu;Yangsen Ye;Chen Zha;Shaowei Li;Shaojun Guo;Haoran Qian;He-Liang Huang;Jiale Yu;Hui Deng;Hao Rong;Jin Lin;Yu Xu;Lihua Sun;Cheng Guo;Na Li;Futian Liang;Cheng-Zhi Peng;Heng Fan;Xiaobo Z
• 通讯作者: Xiaobo Z