Simultaneous measurement of DC and AC magnetic fields at the Heisenberg limit

Understand

High-precision magnetic field measurement is an ubiquitous issue in physics and a critical task in metrology.

• Generally, magnetic field has DC and AC components and it is hard to extract both DC and AC components simultaneously.
• The conventional Ramsey interferometry can easily measure DC magnetic fields, while it becomes invalid for AC magnetic fields since the accumulated phases may average to zero.
• Here, we propose a scheme for simultaneous measurement of DC and AC magnetic fields by combining Ramsey interferometry and rapid periodic pulses.