Attosecond timing clocks the birth of quantum entanglement
Researchers from China and TU Wien directly measured the ultrafast onset of quantum entanglement on attosecond timescales by using intense laser pulses to eject and track electrons. They show the birth time of the departing electron is not definite and links to the energy state of the remaining electron, with typical timing differences around 232 attoseconds. A two-laser protocol enables these measurements, potentially enabling lab studies of ultrafast entanglements and informing future quantum technologies such as cryptography and computing. The findings were published in Physical Review Letters.
