The Student Who Predicted Quantum Tunnelling

Brian Josephson changed condensed-matter physics at age twenty-two by predicting that a supercurrent could pass through a thin barrier separating two superconductors. The Josephson effects were soon confirmed and became the basis of SQUID magnetometers, voltage standards and superconducting quantum devices. This documentary follows his education at Cambridge, the skepticism surrounding his idea, its dramatic experimental verification and the Nobel Prize that recognized one of the most remarkable predictions in.

Josephson junctions now sit at the heart of superconducting electronics, precision metrology and many quantum computers. His story shows how a theoretical calculation by a graduate student can become a practical technology used in medicine, astronomy and fundamental research. It also captures the tension between bold prediction and expert skepticism. By following the journey from an equation to a Nobel Prize, this documentary makes quantum tunnelling tangible and reveals how fragile barriers can produce powerful.