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Last Word is Â鶹´«Ã½â€™s long-running series in which readers give scientific answers to each other’s questions, ranging from the minutiae of everyday life to absurd astronomical hypotheticals. To answer a question or ask a new one, email lastword@newscientist.com
Quantum physicists talk a lot about entanglement. How exactly does one entangle two photons? And can I try it at home?
Mike Follows
Sutton Coldfield, West Midlands, UK
One method of entangling two photons involves using a laser and a process known as spontaneous parametric down-conversion. When a high-energy photon from a laser interacts with a specially…
