Nature Physics最新文献_第4页

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 19.6 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":"https://doi.org/10.1038/s41567-025-02961-2","url":null,"abstract":"<p>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.</p>","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"184 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","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":"","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

Beet fringes and dimples 甜菜条纹和酒窝

IF 18.4 1区物理与天体物理

Nature Physics Pub Date : 2025-08-11 DOI: 10.1038/s41567-025-03006-4

Elizaveta Dubrovina

引用次数: 0

We never thought alone 我们从未独自思考