Unwanted couplings in NV-center and rubidium quantum memories can amplify retrieved signals past unity while apparent noise stays zero, signaling hidden quantum noise.
Simon, Nature Photonics 11, 678 (2017)
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Unwanted couplings can induce amplification in quantum memories despite negligible apparent noise
Unwanted couplings in NV-center and rubidium quantum memories can amplify retrieved signals past unity while apparent noise stays zero, signaling hidden quantum noise.