Article
Quantum Science & Technology
Michael Berger, Jamal Berakdar
Summary: Quantum states of systems with classical chaotic dynamics can be scarred, and this study demonstrates how the scarred state can be imaged to a region that does not support scarring. This phantom scar has a significant impact on the spin-dependent system dynamics, as shown by explicit calculations for fidelity and correlation functions. Numerical simulations and analysis for the spin-dependent electron dynamics in semiconductor-based double quantum dots provide insights into the coherent phenomenon of scarring and its localization properties in a narrow spectral window.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Multidisciplinary
Dries Sels, Anatoli Polkovnikov
Summary: We investigate the crossover from ergodic to nonergodic behavior in an interacting spin chain with sparse impurity density. By studying the relaxation and delocalization of these impurities, we find that they always exchange energy with the rest of the chain, leading to weakly dependent relaxation rates and exponential decay with field strength. This relaxation is connected to operator spreading and hinders the construction of local integrals of motion. In the high field limit, the impurities appear localized, but eventual delocalization occurs due to a flowing localization length.
Article
Materials Science, Multidisciplinary
Umar Javed, Jamir Marino, Vadim Oganesyan, Michael Kolodrubetz
Summary: In this study, we investigate the dynamics of the one-dimensional Ising model in the presence of a static symmetry-breaking boundary field. We observe oscillatory correlations with power-law decay and discover a phase diagram of dynamical responses, which directly relates to changes in the number of edge modes as the boundary and bulk magnetic field are varied. We propose experimental setups, such as Rydberg chains, to demonstrate the universal physics.
Article
Physics, Applied
Y. N. Dong, X. N. Zhao, X. Han, Y. B. Fan, X. J. Xie, Y. X. Chen, L. H. Bai, Y. Y. Dai, S. S. Yan, Y. F. Tian
Summary: The study demonstrates the realization of all 16 Boolean logic functions within a single four-state nonvolatile magnetic heterojunction, utilizing controllable field-free spin-orbit torque switching. By assigning different values to four variables of the four-state memory, the complete Boolean logic functions are achieved in three steps.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Gehad Sadiek, Maryam AlQasimi
Summary: In this study, a finite two-dimensional Heisenberg triangular spin lattice coupled to a dissipative Markovian environment at finite temperature in the presence of an external uniform magnetic field is considered. It is shown that inserting a magnetic impurity in the spin system can effectively control the dynamics and asymptotic state of the system. A strong impurity, at a border or central site, enhances its entanglement with other spins and their thermal robustness to the dissipative environment, leading to an asymptotic state independent of the initial state. However, it reduces the entanglement among other spins in the lattice and their thermal robustness, potentially diminishing them depending on its strength and the environment temperature. Moreover, the effect of the impurity increases significantly as the degree of anisotropy of the spin system increases. Therefore, the entanglement distribution over the different sites of the lattice can be modulated by tuning the impurity strength, system anisotropy, and environment temperature. The impurity can be used as a switch that simultaneously turns on entanglement among specific spins and turns it off among others.
RESULTS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
G. A. R. van Dalum, C. Ortix, L. Fritz
Summary: In this paper, a one-dimensional insulator with approximate chiral symmetry belonging to the AIII class was constructed by intentionally polluting the edge of a two-dimensional quantum spin Hall insulator with magnetic impurities. The resulting bound states hybridize and disperse along the edge, with discussions on the existence of zero-dimensional boundary modes. The construction is independent of impurity lattice details, and the stability of zero modes against disorder and random lattice configurations was confirmed numerically in a microscopic model.
Article
Materials Science, Ceramics
Rongqing Jiang, Hanwei Wu, Kai Li, Wenchao Zhang, Yunlan Guo, Jing Wang, Chao Liu
Summary: In this study, the influence of Na2O concentration on the precipitation of CdSe quantum dots (QDs) in glasses is investigated. It is found that higher Na2O concentration leads to decreased connectivity and solubility of Se in the glass, resulting in the formation of Se-related clusters and lower temperature for the precipitation of CdSe QDs. In glasses with lower Na2O concentration, defect-related photoluminescence (PL) is suppressed and the overall PL changes from dual band to narrow band with tunable wavelength in the visible range. Glasses with higher Na2O concentration only exhibit dual band PL due to phase separation during high temperature heat-treatment. These results demonstrate that the PL properties of QDs in glasses can be modulated by adjusting the glass composition and structure.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Physics, Fluids & Plasmas
Kumpei Shiraishi, Yusuke Hara, Hideyuki Mizuno
Summary: This study investigates the behavior of localized vibrations during the ideal glass transition using a random pinning method. The research reveals that these vibrations persist even in equilibrium glass states and maintain their characteristics below the boson peak frequency.
Article
Chemistry, Multidisciplinary
Wei-Ling Jiang, Zhiyong Peng, Bin Huang, Xiao-Li Zhao, Di Sun, Xueliang Shi, Hai-Bo Yang
Summary: This study systematically investigated the spin-spin interactions of exo- and endo-TEMPO radical-functionalized metallacycles and metallacages constructed via coordination-driven self-assembly. The results revealed distinct spin-spin interactions in solution and solid states, with a large zero-field splitting observed in certain crystalline forms. Moreover, reversible on-off switching of the zero-field splitting was successfully achieved via crystal-to-amorphous transformation induced by mechanical grinding and solvent vapor stimuli.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Laura Kim, Hyeongrak Choi, Matthew E. E. Trusheim, Hanfeng Wang, Dirk R. R. Englund
Summary: Nitrogen vacancy centers in diamond provide a spin-based qubit system with long coherence time even at room temperature, making them suitable ambient-condition quantum sensors for quantities including electromagnetic fields, temperature, and rotation. The optically addressable level structures of NV spins allow transduction of spin information onto light-field intensity. The sub-optimal readout fidelity of conventional fluorescence measurement remains a significant drawback for room-temperature ensemble sensing. Here, we discuss nanophotonic interfaces that provide opportunities to achieve near-unity readout fidelity based on IR absorption via resonantly enhanced spin-optic coupling. Spin-coupled resonant nanophotonic devices are projected to particularly benefit applications that utilize micro- to nanoscale sensing volume and to outperform present methods in their volume-normalized sensitivity.
Article
Quantum Science & Technology
Junghyun Lee, Keigo Arai, Huiliang Zhang, Mark J. H. Ku, Ronald L. Walsworth
Summary: This study demonstrates the transitions of a Chern number from 0 to 3 in an electronic-nuclear spin system associated with the nitrogen-vacancy (NV) centre in diamond. The topological transitions between different phases are realized by varying the radius and offset of the control Hamiltonian parameter sphere, showing consistency with numerical calculations.
NPJ QUANTUM INFORMATION
(2023)
Review
Chemistry, Multidisciplinary
Shuxuan Tang, Xinping Wang
Summary: Spin frustration, resulting from geometric frustration and the inability to simultaneously satisfy all antiferromagnetic interactions, is highly important in physics and materials science. Organic radical species, with their flexible chemical structures, show great potential in building spin-frustrated molecules and lattices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Charlotte Pughe, Otto H. J. Mustonen, Alexandra S. Gibbs, Stephen Lee, Rhea Stewart, Ben Gade, Chennan Wang, Hubertus Luetkens, Anna Foster, Fiona C. Coomer, Hidenori Takagi, Edmund J. Cussen
Summary: Ba2CuTeO6 is a material with a two-leg spin ladder structure of Cu2+ cations, which can be chemically tuned by substituting non-magnetic Zn2+ at the Cu2+ site. The substitution partitions the spin ladders into clusters, leading to a transition from long-range order to spin-freezing as the Zn2+ substitution increases. This provides a well-controlled tuning of the magnetic disorder and a model system for studying defects and segmentation in low-dimensional quantum magnets.
CHEMISTRY OF MATERIALS
(2023)
Article
Physics, Condensed Matter
Jiyuan Bai, Minqian Chen, Changjie Zhou, Yadong Li, Kongfa Chen, Zelong He
Summary: In this study, we designed and investigated an A-B interferometer with different embedded quantum dot structures to achieve controlled spin-polarized transport. Our results demonstrate that the introduction of an external field has a significant impact on the transmission coefficient and current characteristics, which can be controlled by adjusting relevant parameters for spin-polarized transport.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Norihiro Oyama, Hideyuki Mizuno, Atsushi Ikeda
Summary: This letter reports that the instantaneous normal modes with negative eigenvalues, or so-called imaginary modes, serve as the structural signatures for the Herschel-Bulkley rheology in sheared glasses, providing new insights into the structural origins of the Herschel-Bulkley law.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Luca Chirolli, Norman Y. Yao, Joel E. Moore
Summary: The hybrid architecture proposed in this Letter combines a superconducting qubit with a topologically protected Majorana memory, enabling the combination of fast gates and long-lived quantum memories.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Bingtian Ye, Francisco Machado, Jack Kemp, Ross B. Hutson, Norman Y. Yao
Summary: This study reveals the anomalous nature of high-temperature spin transport dynamics and proposes the universality of KPZ dynamics in integrable spin chains with non-Abelian symmetry. The researchers also observe the generality of KPZ transport in supersymmetric and periodically driven models. Based on recent advances in alkaline-earth-based optical lattice experiments, a protocol to directly investigate the KPZ scaling function in such systems is proposed.
PHYSICAL REVIEW LETTERS
(2022)
Review
Physics, Multidisciplinary
Sarang Gopalakrishnan, Romain Vasseur
Summary: This article reviews the transport properties of the XXZ spin chain using a intuitive quasiparticle picture based on the framework of generalized hydrodynamics. It discusses the emergence of anomalous linear response properties from hierarchies of quasiparticles in both integrable and near-integrable limits, with a focus on the role of hydrodynamic fluctuations. The article also comments on recent developments including non-linear response, full-counting statistics, and far-from-equilibrium transport, and provides an overview of recent numerical and experimental results on transport in XXZ spin chains.
REPORTS ON PROGRESS IN PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Lillian B. Hughes, Zhiran Zhang, Chang Jin, Simon A. Meynell, Bingtian Ye, Weijie Wu, Zilin Wang, Emily J. Davis, Thomas E. Mates, Norman Y. Yao, Kunal Mukherjee, Ania C. Bleszynski C. Jayich
Summary: Using plasma-enhanced chemical vapor deposition epitaxial growth with delta-doping, we have successfully engineered dense 2D nitrogen and NV layers with a density of 1 ppm·nm. We characterized the density and dimensionality of the P1 and NV layers using traditional materials techniques and NV spin decoherence-based measurements. The P1 density was found to be between 5-10 ppm·nm, the NV density can be tuned to 1-3.5 ppm·nm by electron irradiation dosage, and the depth confinement of the spin layer is approximately 1.6 nm. We also observed a high ratio of NV to P1 centers up to 0.74 and reproducibly long NV coherence times, mainly influenced by dipolar interactions with the engineered P1 and NV spin baths.
Article
Multidisciplinary Sciences
Cheng Chen, Guillaume Bornet, Marcus Bintz, Gabriel Emperauger, Lucas Leclerc, Vincent S. Liu, Pascal Scholl, Daniel Barredo, Johannes Hauschild, Shubhayu Chatterjee, Michael Schuler, Andreas M. Laeuchli, Michael P. Zaletel, Thierry Lahaye, Norman Y. Yao, Antoine Browaeys
Summary: Spontaneous symmetry breaking is the basis of classifying phases of matter and their transitions, and continuous symmetry breaking leads to the emergence of gapless Goldstone modes that control the thermodynamic stability of the ordered phase. In this study, a two-dimensional dipolar XY model is realized using a programmable Rydberg quantum simulator, and the presence of long-range XY order is characterized. This work complements recent studies on Ising-type interactions showing discrete spin rotation symmetry using the Rydberg-blockade mechanism.
Article
Physics, Multidisciplinary
Pai Peng, Bingtian Ye, Norman Y. Yao, Paola Cappellaro
Summary: Probing strongly interacting quantum systems with high spatial resolution can be challenging. An experiment now uses disorder in nuclear spin chains as a local probe to investigate spin and energy hydrodynamics. Our approach leverages the intrinsic disorder present in a solid-state spin ensemble to measure local correlation functions, down to single-site resolution, despite access to only global controls. We investigate the cross-over between ballistic and diffusive hydrodynamics by tuning the interaction Hamiltonian via Floquet engineering.
Article
Physics, Multidisciplinary
E. J. Davis, B. Ye, F. Machado, S. A. Meynell, W. Wu, T. Mittiga, W. Schenken, M. Joos, B. Kobrin, Y. Lyu, Z. Wang, D. Bluvstein, S. Choi, C. Zu, A. C. Bleszynski Jayich, N. Y. Yao
Summary: The quantum decoherence dynamics of probe spins in diamond defects can be used to study strongly interacting many-body systems, and the information about the many-body system can be obtained by measuring the decoherence dynamics of the probe qubit.
Article
Physics, Multidisciplinary
Javad Kazemi, Hendrik Weimer
Summary: This study theoretically analyzes the steady state of a van der Waals interacting Rydberg gas in an optical lattice, with a focus on the physics of the Rydberg blockade. The research finds that, under sufficiently strong dephasing, the steady state undergoes a first order phase transition from a blockaded Rydberg gas to a facilitation phase where the blockade is lifted. This transition terminates in a critical point, offering a promising route to investigate dissipative criticality in these systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Quantum Science & Technology
Aniruddha Bapat, Andrew M. Childs, Alexey V. Gorshkov, Eddie Schoute
Summary: The SWAP gate is a classical operation that can be considered as a tool for moving information on quantum hardware. However, genuine quantum operations have the potential to outperform SWAP in terms of qubit permutation within an architecture, which is known as routing. We explore quantum routing in two models, allowing either arbitrary two-qubit unitaries or Hamiltonians with norm-bounded interactions. Through spectral analysis of graphs representing interaction constraints, we provide lower bounds for the circuit depth or time of quantum routing and a generalized upper bound for all simple connected n-vertex graphs. Additionally, we identify conditions for a superpolynomial classical-quantum routing separation, excluding graphs with a small spectral gap and graphs of bounded degree. Finally, we demonstrate examples of quadratic separation between gate-based and Hamiltonian routing models, with a constant number of local ancillas per qubit, as well as an O(n) speedup with fast local interactions.
Review
Physics, Multidisciplinary
Michael P. Zaletel, Mikhail Lukin, Christopher Monroe, Chetan Nayak, Frank Wilczek, Norman Y. Yao
Summary: The spontaneous breaking of time-translation symmetry has led to the discovery of a new phase of matter called the discrete time crystal. This Colloquium reviews recent theoretical and experimental advances in the study of quantum and classical discrete time crystals, focusing on the breaking of ergodicity as the key to understanding these crystals. The paper discusses theoretical strategies to stabilize time crystalline order and experimental platforms for investigating time-crystalline order.
REVIEWS OF MODERN PHYSICS
(2023)
Article
Multidisciplinary Sciences
Lee R. Liu, Dina Rosenberg, P. Bryan Changala, Philip J. D. Crowley, David J. Nesbitt, Norman Y. Yao, Timur V. Tscherbul, Jun Ye
Summary: This study reports the observation of rotational ergodicity breaking in the large molecule C-12(60). The unique combination of symmetry, size, and rigidity of the molecule leads to the peculiar dynamics observed.
Article
Materials Science, Multidisciplinary
Amit Jamadagni, Javad Kazemi, Hendrik Weimer
Summary: We propose a binary classifier based on neural networks to detect gapped quantum phases. By considering the errors on a suitable reference state, we demonstrate that a neural network trained on these errors can capture the correlation between the errors and detect the phase boundaries. We apply this method to matrix product state calculations for various quantum phases.
Article
Physics, Multidisciplinary
Aniruddha Bapat, Eddie Schoute, Alexey Gorshkov, Andrew M. Childs
Summary: The study introduces a time-independent Hamiltonian protocol for the reversal of qubit ordering in a chain of spins, achieving faster state reversal than a naive approach using SWAP gates. By proving lower bounds on state reversal using entanglement capacity results, the protocol demonstrates advantages in implementing state reversal and offers extensions to other types of Hamiltonian protocols.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Christopher M. Langlett, Zhi-Cheng Yang, Julia Wildeboer, Alexey Gorshkov, Thomas Iadecola, Shenglong Xu
Summary: This study develops a generic construction that embeds a new class of quantum many-body scars, called rainbow scars, into the spectrum of an arbitrary Hamiltonian. Unlike other examples of quantum many-body scars, rainbow scars display extensive bipartite entanglement entropy and can occur multiple times or even throughout the spectrum in the presence of internal symmetries.
Correction
Optics
Zachary Eldredge, Michael Foss-Feig, Jonathan A. Gross, S. L. Rolston, Alexey V. Gorshkov
