decoherence

New physics research indicates that quantum systems retain a form of memory of their initial conditions, meaning they never fully lose information about where they came from. The finding, covered by physics news outlets, challenges assumptions about how quantum states lose coherence over time and could inform work on quantum information and decoherence.

A new physics study reports that decoherence — the process by which quantum systems lose coherence through interaction with their environment — suppresses quantum tunneling in a cosmological context. The finding suggests tunneling effects may be far weaker in the early universe than idealized quantum models predict, with potential implications for theories of cosmic inflation and phase transitions in the early cosmos.

Researchers have derived a new formula for the return probability of a qubit, a measure of how likely a quantum bit is to return to its initial state. The result, reported by Quantum Zeitgeist, is relevant to quantum computing specialists studying qubit dynamics and decoherence. Details of the research team, publication venue, and practical implications have not yet been widely reported.