Physics Research
Cuprate Specific Heat Decomposed: Pairon Excitations and Antiferromagnetic Correlations as Dual Drivers
Analysis of specific heat data across three cuprate compounds (La₂₋ₓSrₓCuO₄, Bi₂Sr₂CaCu₂O₈₊δ, YBa₂Cu₃O₇₋δ) reveals that thermal excitations above Tc are governed by two distinct temperature scales: the pseudogap T* (linked to pairon excitations) and the magnetic correlation temperature T_max (linked…
Pairon Model Derives Universal Magnetic Scaling Laws for Cuprate Superconductors
Using a pairon model framework, Noat et al. construct the magnetic field phase diagram of hole-doped high-Tc cuprates — a dimension of the phase diagram historically underexplored relative to the temperature axis. The model identifies two characteristic energies (pair binding energy Δp and condensat…
Pairon Excitations as the Missing Link in Cuprate High-Tc Superconductivity
Noat, Mauger, and Sacks propose that condensation in high-Tc cuprate superconductors is governed by strong coupling between the condensate and pairon (pair excitation) states, following Bose statistics — not by retardation-based mechanisms like phonon or spin-fluctuation mediation. Their model deriv…
Coupled-Cluster Imaginary-Time Evolution for Irreasonable Solutions
This paper introduces a coupled-cluster formalism utilizing imaginary-time evolution from an arbitrary reference. This method converges to standard coupled-cluster amplitude equations when finite solutions exist. Crucially, it provides additional information even when standard solutions are not avai…
Kirkwood-Dirac Distributions Unify Optical Coherence
This paper elucidates the role of Kirkwood-Dirac (KD) distributions in classical optics, establishing a direct link between these distributions and optical coherence. The authors demonstrate that KD distributions serve as generalized mutual coherence functions, offering a unified framework to interp…
Effective Intensity Matching for Ionization Mechanism Discrimination
A novel experimental technique, Effective Intensity Matching (EIM) coupled with Intensity Selective Scanning (ISS), enables the comparison of ionization processes in ultrafast laser pulses, independent of pulse ellipticity and diffraction effects. This method allows for direct comparison with theore…
Ultrafast Tunnel Ionization Induces Simultaneous Electron Excitation
This paper presents experimental evidence demonstrating that ultrafast multi-electron tunnel ionization of argon atoms, using circularly-polarized 50 femtosecond laser pulses, results in simultaneous excitation of remaining electrons via a "shake-up" mechanism. This contradicts traditional models th…
Withdrawn Paper Challenges Electromagnetism Gauge Concept
This withdrawn paper critically examines the "gauge concept" in electromagnetism, deeming it fallacious. The authors posit that "groupthink" perpetuated this concept within physics literature. The paper suggests that the simplicity of refuting the concept implies a historical neglect of scientific r…
Symmetry-Based Qubits for Deterministic Linear-Optical Quantum Computing
This paper introduces a novel approach to deterministic linear-optical quantum computing by utilizing a nonstandard, symmetry-based qubit. This method enables the creation of compact, low-resource controlled-NOT (CNOT) gates without relying on post-selection or ancillary measurements. The proposed a…
Experimental Realization of Continuous-Variable Two-Dimensional Microwave Cluster States
This paper demonstrates the experimental creation of 2D continuous-variable (CV) cluster states in the microwave domain, utilizing 191 microwave frequency modes. The technique involves exposing vacuum fluctuations to a Josephson Parametric Amplifier with precisely tuned pump tones. This method succe…
New Quantifiers and Detectors for Quantum-State Texture
This paper introduces a novel method for quantifying quantum-state texture using the $\alpha$-$z$ Rényi relative entropy. It also explores the interconnections between existing texture measures and proposes the systematic integration of texture witnesses, akin to other resource theories in quantum m…
Interaction-mediated non-reciprocity in open quantum systems
This paper investigates how density-density interactions facilitate the transfer of bath-induced non-reciprocity across different degrees of freedom in open quantum many-body systems. The study utilizes an analytically solvable model, a 1D spin-1/2 Fermi-Hubbard chain with all-to-all Hatsugai-Kohmot…
John Preskill’s Enduring Influence on Theoretical Physics Nomenclature
John Preskill, a prominent theoretical physicist, continues to influence the academic discourse, notably by coining phrases that inspire research paper titles. This demonstrates his impact extends beyond direct research contributions to shaping the linguistic landscape of theoretical physics. His in…
Experimental Observation of Conformal Field Theory Spectra in Quantum Phase Transitions
This work presents the first direct experimental observation of energy excitation spectra in emergent Conformal Field Theories (CFTs) at quantum phase transitions. The researchers developed and implemented a modulation technique to resolve the finite-size spectra of a Rydberg chain, which was tuned …
Quantum Criticality Enhances Sensing Beyond Standard Limits
This paper details interferometric sensing protocols leveraging quantum critical wavefunctions, comparing their performance against GHZ and spin-squeezed states. It introduces a symmetry-based algorithm for optimal measurement strategies in both magnetic and Rydberg atom systems. The research invest…
Temporal Symmetry as a Heuristic for Quantum Teleportation Applications
Quantum teleportation can be modeled via time-symmetric descriptions involving forward and backward temporal particle movement. This specific conceptual framework provides actionable intuition for developing new quantum applications.
Cavity Axion Haloscope Repurposed to Set Leading Constraints on High-Frequency Gravitational Waves from Black Hole Superradiance
Reanalysis of CAPP-12T MC axion haloscope data at 5.311 GHz detects no monochromatic high-frequency gravitational waves (HFGW), yielding 90% CL strain exclusion limits of h_0 ≈ 3.9 × 10^{-21} in optimal sky regions. In the black hole superradiance axion cloud model, this excludes M_BH ≃ 1.22 × 10^{-…
Solid-State Thorium-229 Nuclear Clocks: Prospects and Challenges
This paper reviews the potential of solid-state nuclear clocks utilizing the low-energy 8.4 eV nuclear transition in Thorium-229. The authors discuss the fundamental physics, technological hurdles, and current limitations of atomic clocks, contrasting them with the prospective advantages of a Th-229…
Many-Body Phenomena in Germanium Quantum Dots
Researchers have successfully performed spectroscopy on an array of eight interacting spins in gate-defined germanium quantum dots. This work advances quantum simulation by demonstrating a method to reconstruct the complete energy spectrum of many-body eigenstates. A significant finding is the obser…
Enhanced Randomness Extraction from Causally Independent Processes
This paper demonstrates a method for extracting uniform randomness from two causally independent processes, even when their inputs are correlated. This advances previous work that assumed conditional independence. The key innovation lies in leveraging spacelike separation to enforce channel independ…
Experimental Verification of Relativistic Bohmian Mechanics
This paper reports the first direct observation of relativistic aspects within Bohmian mechanics using weak measurement techniques in a double-slit interferometer. The experiment reconstructs relativistic Bohmian trajectories of single photons and reveals negative effective squared mass density, ind…
Y-Splitter Arrays for Topological Superconductivity
The Y-splitter, a novel circuit element, enables destructive interference of Cooper-pair transport and coherent propagation of split Cooper pairs. When arranged in a two-dimensional star geometry (kagome lattice), these Y-splitters exhibit topological superconducting phases with Chern numbers of ±2.…
Flux-Driven JPAs Optimized for Quantum-Limited Sensitivity in CAPP Axion Haloscope Experiments
Researchers at CAPP have developed and characterized flux-driven Josephson Parametric Amplifiers (JPAs) as quantum noise-limited amplifiers for axion dark matter searches. The work details characterization techniques, bandwidth improvement methods, and achievement of ultra-low noise temperatures to …
Extending Wormhole Teleportation in SYK Models
This paper extends a known protocol for wormhole teleportation to enable it between two entangled Sachdev-Ye-Kitaev (SYK) models using only a classical communication channel. The research uses finite N simulations to demonstrate holographic features characteristic of wormhole teleportation, relating…
Experimental Observation of Magnon Sound Mode in 2D Ferromagnet CrCl3
Researchers observe a hydrodynamic magnon sound mode in atomically thin CrCl3 using NV center quantum coherence to probe thermal magnetic fluctuations. Anomalous temperature dependence—fluctuations increasing as temperature decreases—arises from sharpening damping of the low-energy collective mode d…
Bolometric Detection of Josephson Radiation for Microwave Photon Sensing
This research presents a novel bolometric detection scheme for Josephson radiation, converting AC Josephson current at microwave frequencies (up to 100 GHz) into a measurable DC temperature rise. This method offers an efficient and wide-band thermal detection of microwave photons, providing a sensit…
Flux-Driven JPA Achieves Sub-110 mK Added Noise for Sub-Kelvin Axion Haloscope Detection
Researchers deploy a flux-driven Josephson parametric amplifier (JPA) as the first-stage amplifier in axion haloscope experiments, targeting noise levels near the half-quantum limit at millikelvin temperatures. Measurements demonstrate added noise below 110 mK across 0.938–0.963 GHz, supporting axio…
Cavity Magnonics: Strong Magnon-Photon Coupling for Quantum Technologies
Cavity magnonics explores interactions between magnons in magnetic materials and confined microwave photons, enabling strong coupling and nonlinear regimes. Enhancements via Brillouin light scattering in optical resonators allow magnon distribution control. Cavity-mediated coupling to superconductin…
Polarimetric Technique Enables Shot-Noise-Limited Measurement of SAW Displacement Slope
Researchers demonstrate optical polarimetry for measuring surface acoustic waves (SAW) by converting the slope of the periodically tilting surface into polarization rotation angle. This method provides local measurements of SAW amplitude and phase with resolution set by the optical beam spot size. C…
New bounds and counterexamples for mixed-unitary ranks in quantum channels
This paper investigates the mixed-unitary rank (N) and Choi rank (r) of mixed-unitary quantum channels. It establishes a new upper bound for N in terms of r and presents the first known instances where N exceeds r, specifically for channels with Choi rank d+1 and mixed-unitary rank 2d.
Ab Initio DFT Model Unifies Thermophysical and Optical Properties in Two-Temperature Warm Dense Matter
Presents an ab initio density functional theory model for thermophysical and optical properties of two-temperature warm dense matter, featuring heated electrons and cold ions in a solid lattice during ultrafast laser heating. Optical properties are computed via the Kubo-Greenwood formula. The model …
Uncertainty about Physical Processes Amplifies Information's Energetic Value Beyond kT ln 2
Standard information-energy tradeoffs assign kT ln 2 as the fundamental cost per bit exchanged with a thermal reservoir. However, when uncertainty exists about the specific physical process occurring, the energetic value of resolving that information exceeds kT ln 2 per bit. This effect arises in sc…
Re-evaluating Testability and Probability in Everettian Quantum Theory
This paper argues that common objections to the testability of Everettian Quantum Theory (EQT) stem from misunderstandings of probability and scientific testing methodology. By correcting these misconceptions, the author posits that EQT is indeed testable and, furthermore, that stochastic processes …
A Physicalist Framework for Information via Constructor Theory
This paper proposes a 'Constructor Theory of Information' that defines information solely through the lens of physically possible and impossible transformations. By treating information as a physical entity rather than a mathematical abstraction, it seeks to resolve foundational circularities in inf…
Constructor Theory: A Unified Framework for Fundamental Physics
Constructor theory offers a novel foundational approach to physics, diverging from traditional predictive models by framing fundamental laws in terms of possible and impossible transformations. This framework aims to unify various scientific domains, including information theory and computation, by …