Transient Phase Sensing in a Three-Photon Rydberg Ladder Scheme

Area of Science:

• Atomic Physics
• Quantum Optics
• Sensing Technologies

Background:

• Rydberg atoms show potential for radio frequency (RF) receivers.
• Traditional Rydberg atom applications often require complex setups for phase sensitivity.

Purpose of the Study:

• To demonstrate all-optical sensing of transient RF phase changes using Rydberg atoms.
• To investigate the phase-to-amplitude conversion mechanism in cesium Rydberg systems.
• To explore applications in radar for detecting Doppler shifts and target parameters.

Main Methods:

• Utilizing a narrow-linewidth three-photon ladder excitation scheme in cesium atoms.
• Employing a room temperature vapor cell for Rydberg atom preparation.
• Analyzing probe laser transmission for transient responses to RF phase shifts.
• Implementing phase shifts within RF pulses for radar simulations.

Main Results:

• Achieved all-optical sensing of RF phase shifts without auxiliary fields.
• Observed phase-to-amplitude conversion due to coherency disturbance.
• Demonstrated that response amplitude and frequency correlate with RF detuning.
• Successfully identified Doppler shifts in simulated radar signals.

Conclusions:

• Cesium Rydberg atoms with specific excitation schemes enable direct, phase-sensitive RF detection.
• This all-optical approach simplifies RF sensing and enhances radar capabilities.
• The technique allows for simultaneous measurement of target position and velocity.