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Unconditional security proofs of various quantum key distribution (QKD) protocols are built on idealized assumptions.
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A. Yariv and P. Yeh, Photonics: optical electronics in modern communications (sixth edition) , Oxford University Press (2007)
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Y. Zhao, C.-H. F. Fung, B. Qi, C. Chen, and H.-K. Lo, Physical Review A , 78
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V. Makarov, New Journal of Physics , 11
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H.-K. Lo and Y. Zhao, Encyclopedia of Complexity and Systems Science , 8
2009
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Ø. Marøy, L. Lydersen, and J. Skaar, quant-ph , 0903.3525 (2009)
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C.-H. F. Fung, K. Tamaki, B. Qi, H.-K. Lo, and X. Ma, Quant. Inf. and Comput. , 9
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V. Scarani and C. Kurtsiefer, quant-ph , 0906.4547 (2009); B. Qi, L. Qian, and H.-K. Lo, quant-ph , 1002.1237 (2010)
2010
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http://www.idquantique.com; http://www.magiqtech.com
Cited in the paper.
After the Mach-Zehnder interferometer, if the phase difference between reference and signal pulse is π \pi (0), detector1 (detector2) clicks
Cited in the paper.
The relative magnitude ratio is experimentally tested by appling different voltages on Alice’s phase modulator (PMA in Fig.3) to modulate the signal pulses with the two polarization directions (adjusted by PC in Fig.3). From the data of applied voltages and modulating phases, we got the relative ratio is about 1 : 3. Ref. Yariv gives the parameters of LiNbO3 phase modulator and the relations between phase modulation and the parameters. The relative ratio is 9.6 : 30.9 (see Section 9.2 and Table 9.2 of Ref Yariv )
Cited in the paper.
If the polarization is not properly controlled by PC, after Alice’s modualtion, the original linear polarization state of the signal pulse will change to circular or ellipse polarization state. So, when the signal pulse returns back and passes through Eve’s PBS (see Fig.3), part of it will wrongly go to the long arm instead of the short arm. Since the Detector (Det in Fig.3) is gated, this part will hit the Detector at a wrong time and thus cannot be detected
Cited in the paper.
Here, we repeated the measurement 10 million times for each state. Notice that, in order to reduce the after-pulsing probability, an external dead time has been introduced to both detectors after the detection of a photon by a detector. On average, after each detection event, the following around 46 gating signals will be blocked. So, the total gating number N N can be estimated by N ≈ 10 7 − ( D 1 + D 2 ) × 46 ≈ 2.1 × 10 6 \displaystyle N\approx 10^{7}-(D_{1}+D_{2})\times 46\approx 2.1\times 10^{6} (12)
Cited in the paper.
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