Northwestern University physicists develop first single-positron quantum cyclotron

Physicists at Northwestern University have successfully demonstrated the first one-positron quantum cyclotron, a breakthrough that allows for the isolation and manipulation of a single antimatter particle. The research team, led by Gerald Gabrielse, utilized a cryogenic trap to hold a single positron—the antimatter counterpart of the electron—for approximately one month.

By cooling the environment to roughly 300 millikelvin using a dilution refrigerator and employing a Penning trap within a 5.6-tesla superconducting solenoid, researchers were able to observe and govern quantum state transitions between the lowest energy levels of the particle. This setup allows for a non-destructive reading technique to track the particle's quantum states.

The experiment aims to test CPT symmetry, a principle of the Standard Model stating that physical laws remain unchanged if charge, parity, and time are simultaneously reversed. Specifically, the study seeks to determine if the positron's magnetic moment is equal in magnitude and opposite in sign to that of the electron, potentially probing physics beyond the Standard Model with significantly higher precision than previous experiments.