Quantum microphone

Swedish scientists have created the most sensitive microphone in the world. The device is based on the use of single-electron transistor, in which the voltage can vary due to the movements of individual electrons. The sound creates a ripple on the surface of the crystal, similar to the one that occurs in water when throwing stones. The detector is sensitive to the amplitude of the sound waves of a few percent of the diameter of a proton - the movement, but rather is described by the laws of quantum mechanics than classical.