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Quantum-mechanical electronics
Nowadays, it is possible to control and measure the quantum state of systems with a few degrees of freedom, whether they are microscopic objects like cold atoms and single photons, or macroscopic objects like superconducting circuits. Such delicate experiments require an interface which bridges the gap of orders of magnitudes in energy between the quantum object and the data acquisition system. This problem is solved by an active device: the amplifier.
Although the amplifier is necessary to overcome the noise at the stage of data acquisition, it eventually alters the signal. The Quantum-Mechanical Electronics Group is interested in developing an amplifier for microwave signals which would add to the outgoing signal the minimum of noise allowed by Quantum Mechanics: the equivalent of half a photon of noise added to the input signal.
The fabrication and operation of such an amplifier, together with its experimental applications, span a broad range of quantum physics from particle detection to quantum control and metrology.
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