Science Daily February 2, 2022
Researchers in Switzerland succeeded in forming a control loop consisting of two quantum systems separated by one meter. Within this loop a vibrating membrane was cooled by a cloud of atoms, and the two systems were coupled to one another by laser light. As one of the systems acts as a control unit for the other, no measurement is needed. Instead, the control system is configured to bring the target system into a desired state by means of coherent quantum mechanical interaction. They successfully used this coherent feedback mechanism to reduce the temperature of the oscillating membrane from room temperature to 200 millikelvins (-272.95°C). According to the researchers, hybrid systems of this kind will play an important role in the quantum technology of the future. Potential applications include new types of sensors and quantum networks…read more. Open Access TECHNICAL ARTICLEÂ
Light is used to couple a vibrating membrane to a cloud of atoms in order to form a control loop… Credit: Department of Physics, University of Basel