Nicole Yunger Halpern

Physicists have created an 'anti-qubit' — a quantum bit that evolves backward, like a film in reverse. Paired with an ordinary qubit, it becomes a gold standard sensor that even picks up the hidden direction of weak fields.

A tabletop experiment with a programmable optical circuit proved that the famous thought demon creates a larger temperature difference when the particles of light cannot be told apart. The result ties together heat, information, and quantum statistics, and will be useful for testing quantum devices.