Controlling a sine wave gating single-photon detector by exploiting its filtering loophole

Feng Lin-Xi^{1, 2, †}, Jiang Mu-Sheng^{1, 2, †}, Bao Wan-Su^{1, 2, ‡}, Li Hong-Wei^{1, 2}, Zhou Chun^{1, 2}, Wang Yang^{1, 2}

(color online) Bob’s count rate under the control pulse with different light intensity μ_c. In Fig. 5, the intensity of the blinding laser pulse μ_c is 10⁶. When μ_c is lower than 2.5 × 10⁶, the counts change slowly, but when μ_c reaches 3 × 10⁶, the counts begin to rise sharply and show the super-linearity character. So Eve can control Bob’s SG-SPD by the way without being exposed.