A device capable of amplifying the information in a single particle of light without adding noise has been created.  The researchers were able to amplify the noisy quantum state of a single photon subjected to loss, without adding noise in the process – their amplification actually reduced the noise in the quantum state. 

It is expected the results will stimulate further interest in the fundamental laws that govern how well amplifiers can work and in developing uses of noiseless amplification techniques for other quantum information technology applications.



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