Employing Kitaev's phase estimation algorithm to eliminate phase ambiguity and using GHZ states to obtain the phase simultaneously, we propose and demonstrate a complete quantum phase estimation approach. When dealing with N-party entangled states, our approach delivers a sensitivity upper bound of the cube root of 3 divided by the sum of N squared and 2N, thus outcompeting the performance limit of adaptive Bayesian estimation. Employing an eight-photon experimental approach, we successfully determined unknown phases covering a complete period, resulting in phase super-resolution and sensitivity exceeding the limitations of shot noise. Our letter introduces a novel approach to quantum sensing, marking a substantial advance toward widespread implementation.

The 254(2)-minute decay of ^53mFe, in nature, is the sole documented instance of a discrete hexacontatetrapole (E6) transition. In contrast, discrepancies exist in the reported -decay branching ratio, and a detailed investigation of -ray sum contributions is unavailable. Researchers at the Australian Heavy Ion Accelerator Facility employed experimental methods to investigate the decay sequence of ^53mFe. A definitive quantification of sum-coincidence contributions to the weak E6 and M5 decay branches, achieved for the first time, was facilitated by complementary experimental and computational methods. US guided biopsy The diverse approaches show agreement on the real existence of the E6 transition; the M5 branching ratio and transition rate have also been adjusted. High-multipole transitions, E4 and E6, within the full fp model space, exhibit a quenched effective proton charge, estimated at approximately two-thirds the value of the collective E2 transitions, as determined by shell model calculations. The interconnectedness of nucleons could be the key to understanding this unexpected observation, a stark contrast to the collective nature of lower-multipole electric transitions observed in atomic nuclei.

The anisotropic critical behavior of the order-disorder phase transition of the Si(001) surface's buckled dimers provided insight into the coupling energies. The anisotropic two-dimensional Ising model was employed to analyze high-resolution low-energy electron diffraction spot profiles measured as a function of temperature. The justification for the validity of this approach rests on the considerable correlation length ratio, ^+/ ^+=52, of the fluctuating c(42) domains, observed above the critical temperature T c=(190610)K. The dimer rows' effective coupling is J = -24913 meV, and the coupling across the dimer rows is J = -0801 meV. This interaction is antiferromagnetic in nature with c(42) symmetry.

Theoretical exploration of potential ordered structures emerging from weak repulsive interactions in twisted bilayer transition metal dichalcogenides (e.g., WSe2) subjected to an external perpendicular electric field. Employing renormalization group analysis, we demonstrate that superconductivity persists despite the presence of conventional van Hove singularities. A significant parameter space reveals topological chiral superconducting states, characterized by Chern numbers N=1, 2, and 4 (namely, p+ip, d+id, and g+ig), centered around a moiré filling factor of n=1. Pair-density-wave (PDW) superconductivity, spin-polarized, can appear at particular values of applied electric field in the context of a weak out-of-plane Zeeman field. Spin-polarized PDW states are characterized by features measurable with spin-polarized STM, including spin-resolved pairing gap and quasiparticle interference. Furthermore, the spin-polarized periodic modulation of the electronic structure could lead to a spin-polarized superconducting diode effect.

In the standard cosmological model, the distribution of initial density perturbations is understood to be Gaussian at all scales. Invariably, primordial quantum diffusion produces non-Gaussian, exponential tails in the distribution of inflationary fluctuations. The universe's collapsed structures, notably primordial black holes, are demonstrably impacted by these exponential tails. We demonstrate that these trailing effects also influence the formation of vast-scale cosmic structures, thereby increasing the likelihood of massive clusters like El Gordo, or expansive voids like the one linked to the cold spot in the cosmic microwave background. Given exponential tails, the redshift-dependent halo mass function and cluster abundance are evaluated. Our findings demonstrate that quantum diffusion typically leads to an augmentation in the quantity of heavy clusters and a reduction in the subhalo population, an outcome not captured by the famous fNL corrections. Consequently, these late-Universe hallmarks could be pointers to quantum dynamics during inflation, and their integration into N-body models and validation against astrophysical datasets is critical.

An uncommon class of bosonic dynamic instabilities, emerging from dissipative (or non-Hermitian) pairing interactions, is analyzed by us. Our analysis reveals a surprising outcome: a completely stable dissipative pairing interaction can be combined with simple, stable hopping or beam-splitter interactions to engender instabilities. In addition, the dissipative steady state's purity is sustained until the instability threshold is reached; this contrasts sharply with standard parametric instabilities within such contexts. Pairing-induced instabilities demonstrate an exceptionally pronounced sensitivity to the localization of wave functions. Employing a straightforward yet impactful approach, this method enables selective population and entanglement of edge modes in photonic (or more widely encompassing bosonic) lattices with a topological band structure. Existing lattices can support the resource-friendly dissipative pairing interaction through the addition of a single localized interaction; this design is compatible with diverse platforms, including superconducting circuits.

Periodically driven nearest-neighbor interactions are considered within a fermionic chain model, which also includes nearest-neighbor hopping and density-density interactions. Driven chains, operating in a high drive amplitude regime and at specific drive frequencies m^*, are shown to exhibit prethermal strong Hilbert space fragmentation (HSF). The initial manifestation of HSF in out-of-equilibrium systems is observed here. Our Floquet perturbation analysis yields analytical representations of m^*, enabling precise numerical calculations of the entanglement entropy, equal-time correlation functions, and fermion density autocorrelation for chains of finite length. These quantities undeniably represent a strong HSF pattern. The fate of the HSF, as the tuning parameter departs from m^*, is studied, and the span of the prethermal regime, depending on the drive's amplitude, is explored.

We propose an intrinsic nonlinear planar Hall effect, derived from band geometry, independent of scattering, with a second-order dependence on electric field and a first-order dependence on magnetic field. Our analysis reveals that this effect possesses less stringent symmetry requirements than other nonlinear transport phenomena, and is demonstrated in various nonmagnetic polar and chiral crystal types. GDC1971 Effectively managing the nonlinear output is enabled by its angular dependency's distinct nature. We evaluate this effect in the Janus monolayer MoSSe, experimentally measuring the results, combining it with first-principles calculations. hospital-associated infection Our research has shown an intrinsic transport effect, providing a new perspective on material characterization and offering a novel mechanism for applications in nonlinear devices.

Physical parameter measurements are crucial for the efficacy of the modern scientific method. Optical interferometry is a classic technique for measuring optical phase, where the measurement error is typically bounded by the Heisenberg limit. Protocols built upon highly complex N00N light states are often chosen to facilitate phase estimation at the Heisenberg limit. In spite of extensive research across several decades and various experimental efforts focused on N00N states, no demonstration of deterministic phase estimation has broken the shot-noise limit, let alone reached the Heisenberg limit. Employing a deterministic phase estimation method, we leverage Gaussian squeezed vacuum sources and high-efficiency homodyne detectors to achieve phase estimates exhibiting exceptional sensitivity, vastly exceeding the shot noise limit and outperforming both the standard Heisenberg limit and the performance of a pure N00N state protocol. Our high-efficiency configuration, incurring a total loss of around 11%, provides a Fisher information of 158(6) rad⁻² per photon. This substantial improvement surpasses current state-of-the-art methodologies and surpasses a six-photon N00N state optimal. This significant advancement in quantum metrology has implications for future quantum sensing technologies, enabling the study of light-sensitive biological systems.

Recently discovered layered kagome metals, having the composition AV3Sb5 (where A stands for K, Rb, or Cs), demonstrate a complex interplay between superconductivity, charge density wave ordering, a topologically non-trivial electronic band structure, and geometrical frustration. High-field quantum oscillation measurements of CsV3Sb5 up to 86 Tesla shed light on the electronic band structure linked to its exotic correlated electronic states, enabling the construction of a model for its folded Fermi surface. Large, triangular Fermi surface sheets, dominating the scene, practically cover half of the folded Brillouin zone. Angle-resolved photoemission spectroscopy has not yet detected these sheets, which show a clear pattern of nesting. In this kagome lattice superconductor, the nontrivial topological character of multiple electron bands has been unequivocally established by determining the Berry phases of the electron orbits from Landau level fan diagrams near the quantum limit, entirely without the necessity of any extrapolations.

The phenomenon of superlubricity, a state of significantly diminished friction, arises between atomically flat surfaces of differing atomic structures.