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Dynamic Nonreciprocity with a Kerr Nonlinear Resonator

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Chinese Physics Letters 2022年第12期39卷 28-34页

作者： Rui-Kai Pan Lei Tang Keyu Xia franco nori College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing UniversityNanjing 210023China Shishan Laboratory Suzhou Campus of Nanjing UniversitySuzhou 215000China RIKEN Quantum Computing Center RIKEN Cluster for Pioneering ResearchWako-shiSaitama 351-0198Japan Physics Department The University of MichiganAnn ArborMichigan 48109-1040USA

On-chip optical nonreciprocal devices are vital components for integrated photonic systems and scalable quantum information *** optical isolators and circulators have attracted considerable attention because of their fundamental interest and their important advantages in integrated photonic ***,optical nonreciprocal devices based on Kerr or Kerr-like nonlinearity are subject to dynamical reciprocity when the forward and backward signals coexist simultaneously in a nonlinear ***,we theoretically propose a method for realizing on-chip nonlinear isolators and circulators with dynamic *** nonreciprocity is achieved via the chiral modulation on the resonance frequency due to coexisting self-and cross-Kerr nonlinearities in an optical ring *** work showing dynamic nonreciprocity with a Kerr nonlinear resonator can be an essential step toward integrated optical isolation.

关键词： Nonlinear nonlinear reciprocal

Quantum weak force sensing with squeezed magnomechanics

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 23-32页

作者： Qian Zhang Jie Wang Tian-Xiang Lu Ran Huang franco nori Hui Jing Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Theoretical Quantum Physics Laboratory Cluster for Pioneering ResearchRIKENWako-shi 351-0198Japan Center for Quantum Computing RIKENWako-shi 351-0198Japan Department of Physics University of MichiganAnn Arbor 48109-1040USA College of Physics and Electronic Information Gannan Normal UniversityGanzhou 341000China Academy for Quantum Science and Technology Zhengzhou University of Light IndustryZhengzhou 450002China

Cavity magnomechanics,exhibiting remarkable experimental tunability,rich magnonic nonlinearities,and compatibility with various quantum systems,has witnessed considerable advances in recent ***,the potential benefits of using cavity magnomechanical(CMM)systems in further improving the performance of quantum-enhanced sensing for weak forces remain largely *** we show that,by squeezing the magnons,the performance of a quantum CMM sensor can be significantly enhanced beyond the standard quantum limit(SQL).We find that,for comparable parameters,two orders of magnitude enhancement in the force sensitivity can be achieved in comparison with the case without magnon ***,we obtain the optimal parameter regimes of homodyne angle for minimizing the added quantum *** findings provide a promising approach for highly tunable and compatible quantum force sensing using hybrid CMM devices,with potential applications ranging from quantum precision measurements to quantum information processing.

关键词： quantum force sensing cavity magnomechanics magnon Kerr effect

Extension of Noether's theorem in PT-symmetry systems and its experimental demonstration in an optical setup

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 13-27页

作者： Qi-Cheng Wu Jun-Long Zhao Yu-Liang Fang Yu Zhang Dong-Xu Chen Chui-Ping Yang franco nori Quantum Information Research Center Shangrao Normal UniversityShangrao 334001China School of Physics Nanjing UniversityNanjing 210093China Department of Physics Hangzhou Normal UniversityHangzhou 311121China Theoretical Quantum Physics Laboratory RIKENWako-shiSaitama 351-0198Japan RIKEN Center for Quantum Computing RIKENWako-shiSaitama 351-0198Japan Physics Department The University of MichiganAnn Arbor 48109-1040USA

Noether’s theorem is one of the fundamental laws in physics,relating the symmetry of a physical system to its constant of motion and conservation *** the other hand,there exist a variety of non-Hermitian parity-time(PT)-symmetric systems,which exhibit novel quantum properties and have attracted increasing *** this work,we extend Noether’s theorem to a class of significant PT-symmetry systems for which the eigenvalues of the PT-symmetry Hamiltonian HPTchange from purely real numbers to purely imaginary numbers,and introduce a generalized expectation value of an operator based on biorthogonal quantum *** find that the generalized expectation value of a time-independent operator is a constant of motion when the operator presents a standard symmetry in the PT-symmetry unbroken regime,or a chiral symmetry in the PT-symmetry broken *** addition,we experimentally investigate the extended Noether’s theorem in PT-symmetry single-qubit and two-qubit systems using an optical *** experiment demonstrates the existence of the constant of motion and reveals how this constant of motion can be used to judge whether the PT-symmetry of a system is ***,a novel phenomenon of masking quantum information is first observed in a PT-symmetry two-qubit *** study not only contributes to full understanding of the relation between symmetry and conservation law in PT-symmetry physics,but also has potential applications in quantum information theory and quantum communication protocols.

关键词： Noether’s theorem PT-symmetry systems chiral symmetry optical setup

Ideal Quantum Nondemolition Readout of a Flux Qubit Without Purcell Limitations

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Ideal Quantum Nondemolition Readout of a Flux Qubit Without ...

第十八届全国量子光学学术会议

作者：王信 Adam Miranowicz franco nori 西安交通大学 CEMS RIKEN Faculty of Physics Adam Mickiewicz University Physics Department The University of Michigan

Dispersive coupling based on the large-detuned Rabi model is widely used for quantum nondemolition（QND） qubit readout in quantum computation. However, the measurement speed and fidelity are usually significantly limited by the three Purcell effects: Purcell decay, critical photon numbers, and qubit-dependent Kerr nonlinearity. To avoid these effects, we propose how to realize an ideal QND readout of a gradiometric flux qubit with a tunable gap via its direct dispersive coupling to a bound-tunable measurement resonator. We show that this novel readout mechanism is free of dipole-field interactions, and the qubit-QND measurement is not invaded by intracavity photons. Both qubit-readout speed and fidelity can break through the Purcell limitations. Moreover, this direct dispersive coupling can be conveniently turned on/off via an external control flux. We show how to extend this proposal tp a multi-qubit architecture for a joint qubit readout.

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Quantum algorithm for obtaining the energy spectrum of a physical system

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Quantum algorithm for obtaining the energy spectrum of a phy...

第十五届全国量子光学学术报告会

作者： S.Ashhab franco nori Advanced Science Institute

＜正＞We present a polynomial-time quantum algorithm for obtaining the energy spectrum of a physical system,*** differences between the eigenvalues of the system’s Hamiltonian,provided that the spectrum of interest c...

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Noisy intermediate-scale quantum computers

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Frontiers of physics 2023年第2期18卷 1-62页

作者： Bin Cheng Xiu-Hao Deng Xiu Gu Yu He Guangchong Hu Peihao Huang Jun Li Ben-Chuan Lin Dawei Lu Yao Lu Chudan Qiu Hui Wang Tao Xin Shi Yu Man-Hong Yung Junkai Zeng Song Zhang Youpeng Zhong Xinhua Peng franco nori Dapeng Yu Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Quantum Computing Center and Cluster for Pioneering Research RIKENWakoshiSaitama 351-0198Japan Physics Department University of MichiganAnn ArborMI 48109-1040USA

Quantum computers have made extraordinary progress over the past decade,and significant milestones have been achieved along the path of pursuing universal fault-tolerant quantum *** advantage,the tipping point heralding the quantum era,has been accomplished along with several waves of *** hardware has become more integrated and architectural compared to its toddler *** controlling precision of various physical systems is pushed beyond the fault-tolerant ***,quantum computation research has established a new norm by embracing industrialization and *** joint power of governments,private investors,and tech companies has significantly shaped a new vibrant environment that accelerates the development of this field,now at the beginning of the noisy intermediate-scale quantum ***,we first discuss the progress achieved in the field of quantum computation by reviewing the most important algorithms and advances in the most promising technical routes,and then summarizing the next-stage ***,we illustrate our confidence that solid foundations have been built for the fault-tolerant quantum computer and our optimism that the emergence of quantum killer applications essential for human society shall happen in the future.

关键词： quantum computer quantum algorithm quantum chip

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位于不同腔中空间分离的量子比特纠缠态的制备和量子信息的传输

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位于不同腔中空间分离的量子比特纠缠态的制备和量子信息的传输

第十六届全国量子光学学术报告会

作者：杨垂平苏奇平 franco nori 杭州师范大学理学院物理系

＜正＞通过单个耦合超导量子比特和两个腔的耦合以及超导量子比特和腔的非共振相互作用,提出了制备分别位于两个腔中的两个超导比特的纠缠态以及实现量子信息在这两个超导比特之间传输的方案。本方案所涉及到的量子操作可以通过虚光子...

＜正＞通过单个耦合超导量子比特和两个腔的耦合以及超导量子比特和腔的非共振相互作用,提出了制备分别位于两个腔中的两个超导比特的纠缠态以及实现量子信息在这两个超导比特之间传输的方案。本方案所涉及到的量子操作可以通过虚光子过程实现,因此,操作过程中腔光子的衰减得到了很好的抑制。另外,纠缠态制备或态传输只需要用到单操作步骤,且无需使用经典脉冲,因此本方案操作简单。数值计算表明,对于量子比特是超导相位比特以及腔是一维传输线谐振器的情形,利用该方案可以制备位于两个腔中的两个超导相位比特的高保真度纠缠和实现量子态在不同腔中两个超导相位比特之间的高保真度传输。发表于New Journal of Physics 15,115003（2013）.

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光合作用中光捕获的有效量子模拟

光合作用中光捕获的有效量子模拟

第十八届全国量子光学学术会议

作者：王碧雪陶明杰艾清辛涛 Neil Lambert 阮东郑源忠 franco nori 邓富国龙桂鲁清华大学物理系

接近100%的能量传递效率在光合作用复合物中得到了广泛研究。这一现象引起了物理、生物、化学和材料科学等不同领域的广泛兴趣,因为它可能为太阳能的高效捕获提供有价值的参考。最近,人们在光合作用的光捕获中发现了量子相干效应,其在...

接近100%的能量传递效率在光合作用复合物中得到了广泛研究。这一现象引起了物理、生物、化学和材料科学等不同领域的广泛兴趣,因为它可能为太阳能的高效捕获提供有价值的参考。最近,人们在光合作用的光捕获中发现了量子相干效应,其在能源转移中的潜在作用也引起了广大学者激烈的争论。在本工作中,我们用核磁共振（NMR）完成了光合作用能量转移的量子实验模拟。结果表明,采用log2N个比特系统,可以有效地模拟具有任意结构和热浴光谱密度的发色团。用级联运动方程模拟这样一个系统的计算成本是随着exp（N）增加的,其中N是比特数目。本工作采用的NMR量子模拟可能有效地降低计算的复杂度,即它的计算成本是随着N的多项式增加的。当光谱密度复杂时,在NMR中进行这种量子模拟的好处更大,就像在实际光合作用复合物中一样。这些发现可能有助于阐明能量传递中的量子相干性,并有助于为高效的人工光采集设备提供设计指导。

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