BIOENGINEER

Silicon photonic circuit maps exceptional topology on a Klein bottle

A programmable silicon photonic circuit emulated a two-band non-Hermitian system on a Klein bottle and measured a Fermi arc ...

NumPy 2.5 eig returns complex numbers even for real matrices—the release note's workaround loses the imaginary part

The NumPy 2.5.0 release notes state that the return values of eig and eigvals will always be complex, and that ...
quantumzeitgeist

Classical shadows help quantum computer analyze a complex spin model

Researchers utilize classical shadows and quantum subspace expansion to analyze a complex spin model, reducing measurement ...

[Introduction to Quantum Mechanics] Eigenvalues are real despite being a complex matrix? Diagonalizing a Hermitian matrix

In quantum mechanics, observables such as energy and momentum are represented by operators.In finite-dimensional matrix ...
BIOENGINEER

Physicists Unveil Universal Speed Limits on How Fast Quantum Systems Decay

A team of physicists has derived rigorous universal bounds and exact scaling laws for the maximal decay rate of large open quantum systems, with direct consequences for atomic arrays, superradiance, ...