Article
Optics
F. De Zela
Summary: The physical meaning of the quantum weak value is still debated, but it has become a widely used practical tool. We provide closed-form expressions that can untie weak values from weak measurements, allowing for the inclusion of strong measurements within the framework of weak values.
Article
Multidisciplinary Sciences
Joshua Foo, Estelle Asmodelle, Austin P. Lund, Timothy C. Ralph
Summary: Bohmian mechanics is a nonlocal hidden-variable interpretation of quantum theory that predicts deterministic trajectories for particles in spacetime. This study proposes an approach to construct relativistic Bohmian-type velocity field and applies it to obtain relativistic spacetime trajectories of photons in a Michelson-Sagnac interferometer.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Anffany Chen, Hauke Brand, Tobias Helbig, Tobias Hofmann, Stefan Imhof, Alexander Fritzsche, Tobias Kieling, Alexander Stegmaier, Lavi K. Upreti, Titus Neupert, Tomas Bzdusek, Martin Greiter, Ronny Thomale, Igor Boettcher
Summary: In this study, we introduce and experimentally realize hyperbolic matter as a paradigm for topological states using topolectrical circuit networks with a complex-phase circuit element. We confirm hyperbolic band theory through an unprecedented numerical survey of finite hyperbolic lattices. Our work demonstrates the implementation of hyperbolic graphene as an example of topologically nontrivial hyperbolic matter. This research sets the stage for realizing more complex forms of hyperbolic matter and provides a key ingredient for future experimental simulation of various Hamiltonians with topological ground states.
NATURE COMMUNICATIONS
(2023)
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
Optics
Xu-Lin Zhang, Feng Yu, Ze-Guo Chen, Zhen-Nan Tian, Qi-Dai Chen, Hong-Bo Sun, Guancong Ma
Summary: The study successfully demonstrates non-Abelian braiding by controlling the geometric-phase matrix in a photonic chip, observing its key characteristics crucial for realizing quantum logics. The experiment showed the swapping of photon dwell sites in both classical-light and single-photon experiments, indicating the potential for implementing non-Abelian physics in photonics. The proposed on-chip photonic system opens up possibilities for studying non-Abelian physics and may lead to the development of next-generation non-Abelian photonic devices.
Article
Materials Science, Multidisciplinary
J. M. Wilde, A. Sapkota, W. Tian, S. L. Bud'ko, R. A. Ribeiro, A. Kreyssig, P. C. Canfield
Summary: La2Ni7 is a metallic intermetallic compound with itinerant magnetism that undergoes magnetic phase transitions at different temperatures. A recent study using single crystal samples determined the propagation vector and magnetic moment direction of the three magnetically ordered phases and revealed the influence of temperature.
Article
Physics, Multidisciplinary
Lupei Qin, Luting Xu, Xin-Qi Li
Summary: We present a theoretical analysis for the metrology quality of joint weak measurements (JWMs), in close comparison with the weak-value-amplification technique. We point out that the difference probability function employed in the JWM scheme cannot be used to calculate the uncertainty variance and Fisher information (FI). In order to carry out the metrological precision, we reformulate the problem in terms of difference-combined stochastic variables, which makes all calculations well defined. We reveal that, in general, the metrological precision of the JWM scheme cannot reach that indicated by the total FI, despite that all the readouts are collected without discarding. We also analyze the effect of technical noise, showing that the technical noise cannot be removed by the subtracting procedure, which yet can be utilized to outperform the conventional measurement, when considering the imaginary weak value measurement.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Multidisciplinary Sciences
Janusz E. Jacak
Summary: Using braid symmetry, we rigorously derive the Laughlin function for the main hierarchy 1/q of FQHE in a two-dimensional electron system, proving that its derivation requires topological elements and cannot be completed within local quantum mechanics. Additionally, we propose a generalization of this function to other fractions in the quantum Hall hierarchy.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Benoit Estienne, Jean-Marie Stephan, William Witczak-Krempa
Summary: Understanding the fluctuations of observables is crucial in science. In this study, the authors investigate the fluctuations in a subregion with sharp corners and find that the angle dependence is universal. They show that the prefactor contains important physical information and demonstrate its application in different systems. Additionally, they highlight the similarities between fluctuation shape dependence and quantum entanglement measures.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Rhine Samajdar, Wen Wei Ho, Hannes Pichler, Mikhail D. Lukin, Subir Sachdev
Summary: Density-matrix renormalization group calculations show a wide variety of complex solid phases and a region with dense Rydberg excitations, large entanglement entropy, and no local order parameter on the kagome lattice of neutral atoms at zero temperature. The regime could contain one or more phases with topological order, as suggested by mapping to the triangular lattice quantum dimer model and theories of quantum phase transitions. These results lay the foundation for theoretical and experimental explorations of crystalline and liquid states using programmable quantum simulators based on Rydberg atom arrays.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Ai-Lei He
Summary: In this study, a singular-lattice FCI state with one particle occupying the defect-core orbital is reported, characterized by edge excitations, ground state angular momentum, and optimal trial wave functions.
Article
Quantum Science & Technology
Marcos L. W. Basso, Jonas Maziero
Summary: This article explores the variations in reality of observables under monitoring maps, revealing unexpected phenomena such as the possibility of the reality of X' increasing more than that of X under the monitoring map. The authors provide a quantum circuit for implementing the monitoring map and experimentally verify reality variations of observables using IBM's quantum computers.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Felix Gerken, Thore Posske, Shaul Mukamel, Michael Thorwart
Summary: We develop a microscopic theory to study the two-dimensional spectroscopy of one-dimensional topological superconductors. By considering a ring geometry with periodic boundary conditions, the energy-specific differences caused by topologically protected or trivial boundary modes are bypassed. Numerical and analytical results show that the cross-peak structure in the 2D spectra carries unique signatures of the topological phases of the chain. Our work reveals the potential of 2D spectroscopy in identifying topological phases in bulk properties.
PHYSICAL REVIEW LETTERS
(2022)
Article
Business
Danish Junaid, Zheng He, Farman Afzal
Summary: This study aims to examine the impact of weak formal institutions on different phases of the entrepreneurial process. The findings suggest that weak market institutions restrict all phases of entrepreneurship, while weak state institutions facilitate new business activity and established business phases.
JOURNAL OF BUSINESS RESEARCH
(2022)
Article
Quantum Science & Technology
Sourabh Lahiri, Subhashish Banerjee, A. M. Jayannavar
Summary: Work fluctuation theorems are significant achievements in nonequilibrium Statistical Physics, with recent interest in quantum regimes with generalized measurements. Studies show that in the framework of generalized measurements, the original form of the Jarzynski equality is not exact, but deviations are small and can deduce an approximate effective temperature of the thermal bath. In the limit of projective measurements, the exact form of work fluctuation theorems is recovered.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Multidisciplinary Sciences
Takafumi Ono, Ryo Okamoto, Masato Tanida, Holger F. Hofmann, Shigeki Takeuchi
SCIENTIFIC REPORTS
(2017)
Article
Physics, Multidisciplinary
Keito Hibino, Kazuya Fujiwara, Jun-Yi Wu, Masataka Iinuma, Holger F. Hofmann
EUROPEAN PHYSICAL JOURNAL PLUS
(2018)
Article
Physics, Multidisciplinary
Holger F. Hofmann
FOUNDATIONS OF PHYSICS
(2020)
Article
Physics, Multidisciplinary
Holger F. F. Hofmann, Tomonori Matsushita, Shunichi Kuroki, Masataka Iinuma
Summary: Contrary to common assumption, experimental evidence shows that small polarization rotations applied in the slits of a double-slit experiment physically delocalize individual particles, indicating that their path can be observed.
QUANTUM STUDIES-MATHEMATICS AND FOUNDATIONS
(2023)
Article
Optics
Baihong Li, Holger F. Hofmann
Summary: Broadband energy-time entanglement enhances two-photon absorption rate by precise resonance and short coincidence time. Broadband TPA is not sensitive to intermediate level spectrum, making it optimal for entirely virtual intermediate transitions. By introducing phase dispersion matching intermediate resonances, TPA can be enhanced.
Article
Optics
Ming Ji, Holger F. Hofmann
Summary: This paper investigates the differences between the relations of measurement outcomes represented by nonorthogonal quantum states and the relations suggested by a joint assignment of measurement outcomes that do not depend on the actual measurement context. It demonstrates that the Hilbert space formalism modifies the relation between the measurement outcomes and requires the violation of noncontextual consistency as a consequence of the Hilbert space inner products that describe the contextual relation between the outcomes of different measurements.
Article
Physics, Multidisciplinary
Jonte R. Hance, Ming Ji, Holger F. Hofmann
Summary: By analyzing the quantum Cheshire cat using contextuality theory, we found that the coherence between different states plays a crucial role in its behavior.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Hartmut Lemmel, Niels Geerits, Armin Danner, Holger F. Hofmann, Stephan Sponar
Summary: Recent experimental studies have shown that it is possible to obtain accurate information about the path taken by a particle in a quantum interference scenario by using specific experimental methods, thus overcoming the limitations imposed by conventional uncertainties.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Baihong Li, Holger F. Hofmann
Summary: This study explores the impact of energy-time entanglement on two-photon absorption (TPA) processes, demonstrating that separating two-photon resonance from the temporal dynamics of intermediate levels simplifies the theory. The introduction of a one-dimensional coherence in the Hilbert space provides a description of the role of entanglement in the TPA process. Additionally, transformation into the frequency-difference basis leads to Kramers-Kronig relations for the TPA process, separating off-resonant contributions from resonant contributions.
Article
Optics
Tomonori Matsushita, Holger F. Hofmann
Summary: Obtaining information about observable properties of a quantum system requires physical interaction with an external meter, which depends on the initial quantum coherence of the meter. The sensitivity of the meter is defined by the distinguishability of meter states for different observable values, and it requires quantum coherences. The tradeoff between measurement resolution and backaction is determined by the relation between sensitivity and quantum coherent uncertainty in the external meter.
Article
Physics, Multidisciplinary
Holger F. Hofmann
Summary: The study demonstrates that measurement uncertainties can be observed directly by evaluating the feedback compensation of decoherence induced by the measured system on a probe qubit. The empirical validity of measurement theories that combine initial information of the input state with additional information provided by each measurement outcome is confirmed by introducing measurement uncertainties described by Ozawa in Phys. Rev. A 67, 042105 (2003).
PHYSICAL REVIEW RESEARCH
(2021)
Article
Optics
Holger F. Hofmann
Article
Optics
Holger F. Hofmann
Article
Physics, Multidisciplinary
Taiki Nii, Masataka Iinuma, Holger F. Hofmann
QUANTUM STUDIES-MATHEMATICS AND FOUNDATIONS
(2018)
Article
Optics
Holger F. Hofmann