Single photon delayed feedback: a way to stabilize intrinsic quantum cavity electrodynamics

Area of Science:

• Quantum Physics
• Cavity Quantum Electrodynamics
• Quantum Optics

Background:

• Cavity quantum electrodynamics (CQED) typically studies light-matter interactions within a cavity.
• Achieving strong coupling regimes is crucial for many quantum technologies.
• Controlling quantum correlations in the single photon limit remains a challenge.

Purpose of the Study:

• To propose a theoretical scheme for controlling CQED in the single photon limit.
• To investigate the use of delayed feedback for enhancing light-matter interactions.
• To demonstrate a method for dynamically controlling quantum correlations.

Main Methods:

• Utilizing a single emitter-cavity system operating in the weak coupling limit.
• Employing an external mirror to create a delayed feedback loop.
• Analyzing the quantum correlations between external and internal light modes.
• Theoretically modeling Rabi oscillations induced by the feedback loop.

Main Results:

• The delayed feedback drives the weak coupling system into a strong coupling-type regime.
• Rabi oscillations are observed, directly linked to the electron-photon coupling strength.
• Quantum correlations of external and internal light modes are treated dynamically.
• A method for implementing quantum mechanical time-delayed feedback is demonstrated.

Conclusions:

• Delayed feedback offers a viable method to control CQED in the single photon limit.
• This approach allows for the experimental manipulation of quantum correlations.
• The findings pave the way for advanced quantum feedback control strategies.