Specialty
A new arXiv preprint describes a matrix-free way to estimate precision limits in dynamical quantum measurements when conventional matrix methods become singular. Analytical derivations and numerical examples suggest the proposed bound can track variance changes more closely than the standard quantum Cramér–Rao bound in selected models.
Scientific publication5 min read
A laboratory preprint describes quantum imaging with undetected photons, using a visible camera readout to recover information from an infrared object. The demonstrations report a broad imaging range, spatial-resolution measurements and a faster single-frame mode, but rely on simple test materials and estimated detector comparisons.
Scientific publication5 min read
A preprint reports that a single optical waveguide can concentrate light near its surface and was associated with a higher probability of detecting fluorescence from individual atoms. At zero transport displacement, the reported detection probability was 20% with nanolensing—four times the result without it.
Scientific publication5 min read
A mathematical preprint develops geometric quantities for studying entanglement in bipartite quantum-state space. It derives general bounds for the entangled weight in a Best Separable Approximation and gives more explicit formulas in the two-qubit case.
Scientific publication6 min read
A preprint on entanglement manipulation reports that arbitrary correlated catalysts do not erase every limitation in its finite-dimensional PPT framework. For the state ρ_v, the reported correlated-catalytic PPT distillation rate remains below the corresponding entanglement cost.
Scientific publication5 min read
An arXiv preprint reports that two constructive “shadow” methods can approximate trained quantum machine-learning models used for cloud-cover prediction, sometimes with lower mean squared error under finite-sampling tests. The study is an offline computational evaluation, not evidence of a quantum advantage or improved climate simulation.
Scientific publication5 min read
Researchers tested locally generated continuous-variable quantum key distribution over a deployed hybrid channel and used adaptive post-processing to handle fluctuating transmission. The reported rates were asymptotic, and the finite-size analysis did not produce a positive composable key under the experimental parameters.
Scientific publication5 min read
A theoretical preprint uses graph-based constructions to challenge a universal inverse-square bound relevant to Pauli shadow tomography. The construction exceeds the proposed scaling for its mathematical families, while weaker polynomial bounds and triply efficient protocols remain possible.
Scientific publication4 min read
A computational preprint tests SAKE, a local automatic-differentiation method for transporting nonlinear spectroscopic responses between nearby quantum models. It closely matches a direct benchmark and recovers synthetic controls in one four-level dimer, but the result does not establish accuracy on larger systems or measured data.
Scientific publication4 min read
A proposed resonator protocol uses a multiqubit register and Grover-style amplification to target large states with a prescribed photon number, with evidence limited to modeling and simulation.
Scientific publication3 min read
A theoretical study of a moving object with charged internal degrees of freedom reports no spontaneous velocity-dependent drag in a covariant classical field model and treats damping-like terms in a nonrelativistic version as artifacts.
Scientific publication5 min read
An arXiv preprint describes RL-Trotter, a DDPG-based policy that chooses Trotter step sizes from conservation-law observations and accumulated evolution time. In numerical benchmarks, it had lower reported errors than conventional fixed-step Trotterization and ADA-Trotter, while the evidence remained computational.
Scientific publication3 min read
An arXiv preprint dated 20 August 2026 describes a Boltzmann-style framework that assigns a logarithmic entropy to the Hilbert-space volume of quantum states compatible with a preparation. Analytical examples and simulated checks examine how that volume changes under several constraints.
Scientific publication3 min read
A single computational model produced stripes, spots, holes, labyrinths and defects. Its stripe threshold stayed near a nonzero limit while two exact-shell Gaussian witnesses lost their margins at a physical-noise scale reported to fall as the inverse of N.
Scientific publication3 min read
A modeling study of tunable random quantum circuits found that several measures of structure, sensitivity and information processing were enhanced in an intermediate regime. The result is theoretical and numerical, with task-dependent peaks and no experimental validation.
Scientific publication4 min read
A theoretical and computational study examines when shallow random quantum circuits can be properly learned from black-box queries. It predicts a transition near logarithmic depth as lightcones cover the circuit, while simulations tracked the prediction closely.
Scientific publication4 min read
A new arXiv preprint describes ONEX, a compiler built around the structure of product-based quantum error-correction codes. In computational benchmarks and noise simulations, it produced shorter execution plans and lower modeled logical error rates than the tested baselines. The work has not been validated on physical hardware, and compilation time rose sharply at larger problem sizes.
Scientific publication5 min read
A new arXiv preprint reports high-accuracy classification of predefined entanglement block structures in noisy simulations, while hardware performance declined sharply beyond 13 qubits.
Scientific publication3 min read
An arXiv preprint models mixtures of amplitude-damping and anti-damping channels with independently chosen decay parameters. The analysis finds that these mixtures can reach a wider range of phase-covariant dynamical behaviors than equal-decay generalized amplitude damping, while selected settings can reduce deviation from ideal identity evolution.
Scientific publication6 min read
An arXiv preprint presents a conditional mathematical framework for locating quantum phase transitions. Its examples range from exact bounds in Grover’s model to broader estimates in fermion models.
Scientific publication4 min read
A methods preprint classifies hybrid qubit–rotor transformations and reports universal control after adding two specified controls. Its finite-flux benchmark shows small reported cutoff differences in one open 2 × 1 model; its phase-estimation and Fourier results are logical constructions, not hardware tests.
Scientific publication3 min read
A theoretical preprint reports persistent, state-dependent oscillations in a one-dimensional model of interacting Rydberg atoms. The calculations suggest organized dynamics tied to particular starting states, but the proposed Rydberg implementation has not been experimentally demonstrated.
Scientific publication4 min read
A theoretical arXiv preprint examines whether quantum correlations can be extended with a mechanism called jamming. Its formal results rule out nontrivial positive jamming and find state-dependent jamming incompatible with the paper’s ensemble and no-signaling requirements; constructed examples also expose attacks on two specified relativistic cryptographic protocols.
Scientific publication3 min read
A preprint describes a fan-out compilation method that trades extra qubits for shallower circuits when simulating Heisenberg-type spin systems. In modeled TMS circuits, depth and width-depth volume fell, while noise simulations suggested that post-selection could improve spectral quality at lower error rates.
Scientific publication4 min read
An arXiv preprint reports model-specific collapse suppression and bound-state formation in singular-potential equations. It also describes convergent-norm states in a two-dimensional quintic model and effectively localized states across a full spectrum for steep expulsive potentials, but offers no laboratory measurements.
Scientific publication4 min read
A proof-based arXiv preprint reports classical approximations for several limited quantum query models, with guarantees that hold on most Boolean-oracle inputs. The broader problem of simulating arbitrary fully adaptive quantum query algorithms remains open.
Scientific publication3 min read
An arXiv preprint studies the Tavis–Cummings model at arbitrary excitation numbers by separating its states into symmetry sectors. Its calculations predict that emission shifts toward the cavity energy at high excitation, while the light–matter hybrid character fades. The result depends on zero detuning, uniform coupling and a single cavity mode.
Scientific publication3 min read
The study says a conserved pump-referenced phase charge limits each readout order to particular function sectors, while an optical transducer keeps detection at first order. Its synthetic and RadioML benchmarks favored phase encoding, but the findings are entirely analytic or simulated.
Scientific publication3 min read
A mathematical study applies the extended Nikiforov–Uvarov method to a generalized Klein–Gordon oscillator in Som–Raychaudhuri space–time. It reports model-dependent energy levels and radial wave functions for linear and Cornell-type potentials in a uniform magnetic field.
Scientific publication4 min read