Nature Physics最新文献_第6页

Coherent control of magnon–polaritons using an exceptional point 利用异常点对磁非极化子进行相干控制

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-19 DOI: 10.1038/s41567-025-02998-3

N. J. Lambert, A. Schumer, J. J. Longdell, S. Rotter, H. G. L. Schwefel

{"title":"Coherent control of magnon–polaritons using an exceptional point","authors":"N. J. Lambert, A. Schumer, J. J. Longdell, S. Rotter, H. G. L. Schwefel","doi":"10.1038/s41567-025-02998-3","DOIUrl":"10.1038/s41567-025-02998-3","url":null,"abstract":"In a non-Hermitian system, the amplitude of resonant oscillations can either grow or decay in time, corresponding to a mode with either gain or loss. When two coupled modes have a specific gain–loss imbalance, an exceptional point emerges at which both eigenfrequencies and eigenmodes of the system coalesce. Exceptional points have qualitative effects on the dynamics of systems due to their topological properties, and have been used to control systems including optical microcavities, the lasing of a parity–time-symmetric waveguide and terahertz pulse generation. A challenging open problem is the fully deterministic and direct manipulation of the systems’ loss and gain on timescales relevant to the coherent control of excitations. Here we demonstrate the rapid manipulation of the complex frequency of magnon–polaritons on durations much shorter than their decay rate, allowing us to exploit non-Hermitian physics for coherent control. By dynamically encircling an exceptional point, we demonstrate population transfer between coupled magnon–polariton modes. We then drive the system directly through an exceptional point, and demonstrate that this allows the coupled system to be prepared in an equal superposition of eigenmodes. These findings establish a highly controllable hybrid platform for exploring the rich dynamical properties of non-Hermitian systems. Deterministic control of the gain–loss balance in non-Hermitian systems remains challenging. A magnonic hybrid platform is now shown to enable this and, hence, coherently control excitations by leveraging an exceptional point.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 10","pages":"1570-1577"},"PeriodicalIF":18.4,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145284991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient implementation of arbitrary two-qubit gates using unified control 使用统一控制的任意双量子比特门的有效实现

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-15 DOI: 10.1038/s41567-025-02990-x

Zhen Chen, Weiyang Liu, Yanjun Ma, Weijie Sun, Ruixia Wang, He Wang, Huikai Xu, Guangming Xue, Haisheng Yan, Zhen Yang, Jiayu Ding, Yang Gao, Feiyu Li, Yujia Zhang, Zikang Zhang, Yirong Jin, Haifeng Yu, Jianxin Chen, Fei Yan

{"title":"Efficient implementation of arbitrary two-qubit gates using unified control","authors":"Zhen Chen, Weiyang Liu, Yanjun Ma, Weijie Sun, Ruixia Wang, He Wang, Huikai Xu, Guangming Xue, Haisheng Yan, Zhen Yang, Jiayu Ding, Yang Gao, Feiyu Li, Yujia Zhang, Zikang Zhang, Yirong Jin, Haifeng Yu, Jianxin Chen, Fei Yan","doi":"10.1038/s41567-025-02990-x","DOIUrl":"10.1038/s41567-025-02990-x","url":null,"abstract":"The set of quantum logic gates that can be easily implemented is fundamental to the performance of quantum computers, as it governs the accuracy of basic quantum operations and dictates the complexity of implementing quantum algorithms. Traditional approaches to extending gate sets often require operating devices outside the ideal parameter regimes used to realize qubits, leading to increased control complexity while offering only a limited set of gates. Here we experimentally demonstrate a unified and versatile gate scheme capable of generating arbitrary two-qubit gates using only an exchange interaction and qubit driving on a superconducting quantum processor. We achieve high fidelities averaging 99.38% across a wide range of commonly used two-qubit unitaries, enabling precise multipartite entangled state preparation. Furthermore, we successfully produce a B gate, which efficiently synthesizes the entire family of two-qubit gates. Our results establish that fully exploiting the capabilities of the exchange interaction can yield a comprehensive and highly accurate gate set. With maximum expressivity, optimal gate time, demonstrated high fidelity and easy adaption to other quantum platforms, our unified control scheme offers the prospect of improved performance in quantum hardware and algorithm development. The efficiency of a quantum computer depends on which basic operations it can implement. Now a scheme that can implement any two-qubit logic gate has been demonstrated on a superconducting architecture.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1489-1496"},"PeriodicalIF":18.4,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.comhttps://www.nature.com/articles/s41567-025-02990-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144851616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Entanglement and the density matrix renormalization group in the generalized Landau paradigm 广义朗道范式中的纠缠与密度矩阵重整化群

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-15 DOI: 10.1038/s41567-025-02961-2

Laurens Lootens, Clement Delcamp, Frank Verstraete

{"title":"Entanglement and the density matrix renormalization group in the generalized Landau paradigm","authors":"Laurens Lootens, Clement Delcamp, Frank Verstraete","doi":"10.1038/s41567-025-02961-2","DOIUrl":"10.1038/s41567-025-02961-2","url":null,"abstract":"The fields of entanglement theory and tensor networks have recently emerged as central tools for characterizing quantum phases of matter. Here we determine the entanglement structure of ground states of gapped symmetric quantum lattice models and use this to obtain the most efficient tensor network representation of those ground states. We do this by showing that degeneracies in the entanglement spectrum arise through a duality transformation of the original model to the unique dual model where the entire dual symmetry is spontaneously broken. Physically, this duality transformation amounts to a—potentially twisted—gauging of the unbroken symmetry in the original ground state. In general, the dual symmetries of the resulting models are generalized non-invertible symmetries that cannot be described by groups. This result has strong implications for the complexity of simulating many-body systems using variational tensor network methods. For every phase in the phase diagram, the dual representation of the ground state that completely breaks the symmetry minimizes both the entanglement entropy and the required number of variational parameters. We demonstrate the applicability of this idea by developing a generalized density matrix renormalization group algorithm that works on constrained Hilbert spaces and quantify the computational gains obtained over traditional tensor network methods in a perturbed Heisenberg model. Our work testifies to the usefulness of generalized non-invertible symmetries and their formal category theoretic description for the practical simulation of strongly correlated systems. Quantum spin chains can be represented in several ways, and eigenstates in these dual models have different entanglement structures. By characterizing the dual theories, the optimal tensor network algorithm for simulating the models has been found.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 10","pages":"1657-1663"},"PeriodicalIF":18.4,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.comhttps://www.nature.com/articles/s41567-025-02961-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144851689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Universality in quantum critical flow of charge and heat in ultraclean graphene 超净石墨烯中电荷和热流量子临界流的普遍性

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-13 DOI: 10.1038/s41567-025-02972-z

Aniket Majumdar, Nisarg Chadha, Pritam Pal, Akash Gugnani, Bhaskar Ghawri, Kenji Watanabe, Takashi Taniguchi, Subroto Mukerjee, Arindam Ghosh

{"title":"Universality in quantum critical flow of charge and heat in ultraclean graphene","authors":"Aniket Majumdar, Nisarg Chadha, Pritam Pal, Akash Gugnani, Bhaskar Ghawri, Kenji Watanabe, Takashi Taniguchi, Subroto Mukerjee, Arindam Ghosh","doi":"10.1038/s41567-025-02972-z","DOIUrl":"10.1038/s41567-025-02972-z","url":null,"abstract":"Close to the Dirac point, graphene is expected to exist in a quantum critical Dirac fluid state, where the flow of both charge and heat can be described with a characteristic d.c. electrical conductivity and thermodynamic variables such as entropy and enthalpy densities. Although the fluid-like viscous flow of charge has been reported in state-of-the-art graphene devices, the value of conductivity, predicted to be quantized and determined only by the universality class of the critical point, has not been established experimentally so far. Here we have discerned the quantum critical universality in graphene transport by combining the electrical and thermal conductivities in very high-quality devices close to the Dirac point. We find that they are inversely related, as expected from relativistic hydrodynamics, and the characteristic conductivity converges to a quantized value. We also observe a giant violation of the Wiedemann–Franz law, where the Lorentz number exceeds the semiclassical value by more than 200 times close to the Dirac point at low temperatures. At high temperatures, the effective dynamic viscosity to entropy density ratio close to the Dirac point in the cleanest devices approaches that of a minimally viscous quantum fluid within a factor of four. Critical behaviour is expected in graphene when the carrier density is tuned to the Dirac point. Now, universality associated with the critical point is observed in electronic and thermal transport.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1374-1379"},"PeriodicalIF":18.4,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144824983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

How to twist anyons 如何扭曲任何人

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-13 DOI: 10.1038/s41567-025-03009-1

Matteo Carrega, Stefan Heun

引用次数: 0

A mechanical quantum memory for microwave photons 微波光子的机械量子存储器

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-13 DOI: 10.1038/s41567-025-02975-w

Alkım B. Bozkurt, Omid Golami, Yue Yu, Hao Tian, Mohammad Mirhosseini

{"title":"A mechanical quantum memory for microwave photons","authors":"Alkım B. Bozkurt, Omid Golami, Yue Yu, Hao Tian, Mohammad Mirhosseini","doi":"10.1038/s41567-025-02975-w","DOIUrl":"10.1038/s41567-025-02975-w","url":null,"abstract":"Superconducting qubits possess outstanding capabilities for processing quantum information in the microwave domain; however they have limited coherence times. An interface between photons and phonons could allow quantum information to be stored in long-lived mechanical oscillators. Here, we introduce a platform that relies on electrostatic forces in nanoscale structures to achieve strong coupling between a superconducting qubit and a nanomechanical oscillator with an energy decay time (T1) of approximately 25 ms, well beyond those achieved in integrated superconducting circuits. We use quantum operations in this system to investigate the microscopic origins of mechanical decoherence and mitigate its impact. By using two-pulse dynamical decoupling sequences, we can extend the coherence time (T2) from 64 μs to 1 ms. These findings establish that mechanical oscillators can act as quantum memories for superconducting devices, with potential future applications in quantum computing, sensing and transduction. Superconducting qubits, a leading platform for quantum information processing, suffer from decoherence. Interfacing them with nanomechanical oscillators allows quantum information to be stored in motional states with longer lifetimes.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1469-1474"},"PeriodicalIF":18.4,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144824881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantized limit of conductivity in near-ideal graphene 近理想石墨烯中电导率的量子化极限

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-13 DOI: 10.1038/s41567-025-02974-x

引用次数: 0

Liquid dipole lattice 液体偶极晶格

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-12 DOI: 10.1038/s41567-025-02992-9

Liana Lucchetti

引用次数: 0

Optomechanical control of long-lived bulk acoustic phonons in the quantum regime 量子体制中长寿命体声子的光力学控制

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-11 DOI: 10.1038/s41567-025-02989-4

Hilel Hagai Diamandi, Yizhi Luo, David Mason, Tevfik Bulent Kanmaz, Sayan Ghosh, Margaret Pavlovich, Taekwan Yoon, Ryan Behunin, Shruti Puri, Jack G. E. Harris, Peter T. Rakich

{"title":"Optomechanical control of long-lived bulk acoustic phonons in the quantum regime","authors":"Hilel Hagai Diamandi, Yizhi Luo, David Mason, Tevfik Bulent Kanmaz, Sayan Ghosh, Margaret Pavlovich, Taekwan Yoon, Ryan Behunin, Shruti Puri, Jack G. E. Harris, Peter T. Rakich","doi":"10.1038/s41567-025-02989-4","DOIUrl":"10.1038/s41567-025-02989-4","url":null,"abstract":"High-fidelity quantum optomechanical control of a mechanical oscillator requires the ability to perform efficient, low-noise operations on long-lived phononic excitations. Microfabricated high-overtone bulk acoustic wave resonators (μHBARs) support high-frequency mechanical modes above 10 GHz with coherence times exceeding one millisecond. Here we demonstrate a μHBAR-based cavity optomechanical system that permits quantum optomechanical control of individual high-coherence phonon modes. We perform laser cooling of the phonon modes from an occupation of approximately 22 phonons to fewer than 0.4, corresponding to laser-based ground-state cooling of a mechanical object with a mass of 7.5 μg. During the cooling process we do not observe any absorption-induced heating, demonstrating the resilience of the HBAR optomechanical systems against parasitic heating. Our work demonstrates that μHBARs are promising as the basis for quantum optomechanical systems with robustness to decoherence that is necessary for efficient, low-noise photon–phonon conversion. A massive phonon mode in a high-overtone bulk acoustic wave resonator has been laser cooled close to its ground state. Its robustness to decoherence establishes the potential of these devices for quantum technologies.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"21 9","pages":"1482-1488"},"PeriodicalIF":18.4,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.comhttps://www.nature.com/articles/s41567-025-02989-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144812888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced photon avalanche 增强光子雪崩

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-11 DOI: 10.1038/s41567-025-03007-3

Sonal Mistry

引用次数: 0