Quantum Pyragas control: Selective-control of individual photon probabilities

Understand

Pyragas control allows to stabilize unstable states in applied nonlinear science.

• We propose to apply a quantum version of the Pyragas protocol to control individual photon-probabilities in an otherwise only globally accessible photon-probability distribution of a quantum light emitter.
• The versatility of quantum Pyragas control is demonstrated for the case of a two-level emitter in a pulsed laser-driven half cavity.
• We show that one- and two-photon events respond in a qualitatively different way to the half-cavity induced feedback signal.