quantum fields

Astrophysicist Ethan Siegel argues that quantum fields deserve to be considered physically real because they carry energy, not merely serve as mathematical tools. Writing on Big Think, he situates the question within the long-running debate in quantum physics over what counts as real, such as the wavefunction or eigenstates. The piece offers a philosophical and physical case for treating fields as concrete entities rather than abstractions.

Physicists report a tabletop experiment using ultracold atoms to simulate the creation of particles, mimicking processes that normally occur in extreme environments such as the early universe or strong quantum fields. By controlling cold atomic gases, researchers can model quantum field behavior in the lab, offering a new way to test ideas that are otherwise out of reach of direct experiments.

The US National Security Agency has published a primer explaining post-quantum cryptography, the field of encryption methods designed to withstand attacks by future quantum computers. The document outlines why currently widely used cryptographic algorithms could eventually be broken by quantum machines and what organisations should do to prepare for the transition to quantum-resistant standards.