Quantum amplifier

In physics, a quantum amplifier is an amplifier that uses quantum mechanical methods to amplify a quantum signal; examples include the active elements of optical lasers and optical re-transmitters.

The main properties of the quantum amplifier are its amplification coefficient and uncertainty. These parameters are not independent; the higher the amplification coefficient, the higher the noise. In the case of lasers, the uncertainty corresponds to the amplified spontaneous emission of the active medium. The unavoidable noise of quantum amplifiers is one of the reasons for the use of digital signals in optical communications and can be deduced from the fundamentals of quantum mechanics.