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Attoclock Technique Breaks Ground in Measuring Electron Tunneling Time Quantum Tunneling and the Ultrafast Challenge Under the influence of an intense laser field, electrons may traverse the quantum tunneling barrier — an energy threshold normally insurmountable. This remarkable phenomenon, central to quantum mechanics and termed quantum tunneling, has attracted sustained academic interest. Difficulties in Measuring Tunneling Duration Accurately determining the duration an electron remains within a quantum tunneling barrier during strong-field ionization has long posed difficulties. Recently, physicists have devised sophisticated experimental instruments —attoclocks —capable of capturing ultrafast electron dynamics, potentially resolving this enduring scientific puzzle. The Carrier-Envelope Phase-Based Attoclock Breakthrough Although attoclocks hold promise for measuring electron tunneling times, most existing versions have fallen short, lacking in precision and conclusiveness. In a re...