Time's Arrow Grounded in Quantum Decoherence, Al-Khalili Says
British physicist Jim Al-Khalili argues in On Time that the arrow of time is real and rooted in quantum decoherence and entanglement that occur when we observe systems, rather than being explained mainly by entropy; observation ties quantum systems to the environment and irreversibly fixes their state, while the many-worlds view remains a possibility. The piece also notes limits on time travel and points readers to related interviews and the Fiction Science podcast.
