The concept of enactment in psychotherapy is not directly inspired by quantum physics. Enactment refers to the way in which patterns of behavior and interaction between therapist and patient are reenacted in the therapy session, often reflecting the dynamics of the patient's interpersonal relationships outside of therapy.
Enactment is a key concept in psychodynamic psychotherapy and is based on the idea that the therapist-patient relationship provides a unique opportunity to explore and understand the patient's unconscious patterns of behavior and relationships. While enactment shares some similarities with certain principles of quantum physics, such as the idea that the observer can influence the behavior of particles, the concept itself is not directly inspired by quantum physics.
It's worth noting, however, that some contemporary psychotherapists and theorists have drawn on ideas from quantum physics to inform their understanding of the therapeutic process. For example, some have suggested that the concept of entanglement, which refers to the interconnectedness of particles in quantum physics, can be applied to the therapeutic relationship, where therapist and patient are seen as interconnected and interdependent. However, these ideas are not central to the concept of enactment as traditionally understood in psychodynamic psychotherapy.