◇Quantum Probes and Physical Platforms

A stable atomic transition serves as a reference against which local oscillator drift is measured.

Diamond defects convert magnetic fields into shifts of spin resonance frequencies.

Spin-polarized atomic vapor precesses in magnetic fields.

A force displaces a trapped ion's quantized motion.

Matter waves accumulate phase along different trajectories.

Charge-sensitive superconducting levels shift with electric environment.

A superconducting loop turns magnetic flux into interference of Josephson currents.

Highly polarizable excited atoms respond strongly to electric fields.

Confined electronic levels are sensitive to neighboring charge configurations.

Photon counting resolves faint optical signals beyond analog intensity measurement.

Optical cavities can turn a spin state into a detectable photon response.

Tiny forces shift the motion of a resonator with quantized displacement.