Browsing by Author "Zhong J."

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    Faking photon number on a transition-edge sensor
    (2022-12-01) Chaiwongkhot P.; Zhong J.; Huang A.; Qin H.; Shi S.c.; Makarov V.; Mahidol University
    We study potential security vulnerabilities of a single-photon detector based on superconducting transition-edge sensor. In one experiment, we show that an adversary could fake a photon number result at a certain wavelength by sending a larger number of photons at a longer wavelength, which is an expected and known behaviour. In another experiment, we unexpectedly find that the detector can be blinded by bright continuous-wave light and then, a controlled response simulating single-photon detection can be produced by applying a bright light pulse. We model an intercept-and-resend attack on a quantum key distribution system that exploits the latter vulnerability and, under certain assumptions, able to steal the key.