Light is used to couple a vibrating membrane to a cloud of atoms in order to form a control loop. The two different quantum systems - consisting of the membrane and the spins - therefore regulate one another’s temperature with no need for external measurement. (Image: Department of Physics, University of Basel)
Light is used to couple a vibrating membrane to a cloud of atoms in order to form a control loop. The two different quantum systems - consisting of the membrane and the spins - therefore regulate one another's temperature with no need for external measurement. (Image: Department of Physics, University of Basel) - Researchers from the University of Basel have succeeded in forming a control loop consisting of two quantum systems separated by a distance of one meter. Within this loop, one quantum system - a vibrating membrane - is cooled by the other - a cloud of atoms, and the two systems are coupled to one another by laser light. Interfaces such as this allow different kinds of quantum systems to interact with one another even over relatively large distances and will play a key role in quantum technologies of the future. We've all experienced the principle of feedback — for example, when we use a thermostat in conjunction with a heating system to regulate indoor temperature. The thermostat measures the current temperature, compares it with the target value and regulates the flow of heat accordingly.
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