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Negave Excess Shot Noise by Anyon Braiding

Byeongmok Lee, H.-S. Sim, Cheolhee Han

Published Jan 1, 2018• 0 citations
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We study a practical method to measure the shot noise in real time in continuous-variable quantum key distribution systems. The amount of secret key that can be extracted from the raw statistics depends strongly on this quantity since it affects in particular the computation of the excess noise (i.e., noise in excess of the shot noise) added by an eavesdropper on the quantum channel. Some powerful quantum hacking attacks relying on faking the estimated value of the shot noise to hide an intercept and resend strategy were proposed. Here, we provide experimental evidence that our method can defeat the saturation attack and the wavelength attack.
High-stability single-frequency fiber lasers typically exhibit relative intensity noise that is far in excess of shot noise across a broad frequency range extending from dc to many tens of megahertz. This excess noise precludes the use of these fiber lasers in a range of precision interferometry and quantum optics applications. We present experimental results using a passive, highQ, fiber ring resonator to filter out up to 26 dB of excess laser intensity noise, resulting in a stabilized laser output that reaches the shot-noise limit over most of its signal spectrum.