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Pyragas control allows to stabilize unstable states in applied nonlinearscience. We propose to apply a quantum version of the Pyragas protocol tocontrol individual photon-probabilities in an otherwise only globallyaccessible photon-probability distribution of a quantum light emitter. Theversatility of quantum Pyragas control is demonstrated for the case of atwo-level emitter in a pulsed laser-driven half cavity. We show that one- andtwo-photon events respond in a qualitatively different way to the half-cavityinduced feedback signal. One-photon events are either enhanced or suppressed,depending on the choice of parameters. In contrast, two-photon events undergoexclusively an enhancement up to $50\%$ for the chosen pulse areas. We herebypropose an implementation of quantum Pyragas control via a time-delayedfeedback setup.

Quantum Pyragas control: Selective-control of individual photon probabilities