BB84 Quantum Key Distribution System Based on Silica-Based Planar Lightwave Circuits

Nambu, Yasusada; Hatanaka, Takaaki; Nakamura, Kazuo

doi:10.1143/jjap.43.l1109

Cited by 36 publications

(26 citation statements)

References 14 publications

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“…Also, faked states exploiting detector efficiency mismatch can be constructed for energy-time encoding and differential phase shift keying QKD schemes [41,42,43,44,45]; see examples of faked states in Ref. [46].…”

Section: Discussionmentioning

confidence: 99%

Effects of detector efficiency mismatch on security of quantum cryptosystems

2006

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We suggest a type of attack on quantum cryptosystems that exploits variations in detector efficiency as a function of a control parameter accessible to an eavesdropper. With gated single-photon detectors, this control parameter can be the timing of the incoming pulse. When the eavesdropper sends short pulses using the appropriate timing so that the two gated detectors in Bob's setup have different efficiencies, the security of quantum key distribution can be compromised. Specifically, we show for the Bennett-Brassard 1984 (BB84) protocol that if the efficiency mismatch between 0 and 1 detectors for some value of the control parameter gets large enough (roughly 15:1 or larger), Eve can construct a successful faked-states attack causing a quantum bit error rate lower than 11%. We also derive a general security bound as a function of the detector sensitivity mismatch for the BB84 protocol. Experimental data for two different detectors are presented, and protection measures against this attack are discussed.

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Section: Discussionmentioning

confidence: 99%

Effects of detector efficiency mismatch on security of quantum cryptosystems

2006

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“…An alternative approach to the aforementioned problems based on a one-way interferometer using integrated-optic AMZIs [26][27][28][29] was recently reported. By applying a planar lightwave circuit (PLC), the instability due to the phase drift inherent in a one-way QKD system and the polarization drift in the link fiber were eliminated without introducing 4 any complex active compensation mechanisms.…”

Section: Michelson Interferometer and Faraday Mirrors To Develop An Imentioning

confidence: 99%

One-Way Quantum Key Distribution System Based on Planar Lightwave Circuits

Nambu

Yoshino

Tomita³

2006

jjap

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We developed a one-way quantum key distribution (QKD) system based upon a planar lightwave circuit (PLC) interferometer. This interferometer is expected to be free from the backscattering inherent in commercially available two-way QKD systems and phase drift without active compensation. A key distribution experiment with spools of standard telecom fiber showed that the bit error rate was as low as 6% for a 100-km key distribution using an attenuated laser pulse with a mean photon number of 0.1 and was determined solely by the detector noise. This clearly demonstrates the advantages of our PLC-based one-way QKD system over two-way QKD systems for long distance key distribution.

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“…Interferometers made of low thermal factor materials [13] or integrated planar silica waveguide with thermal and mechanical isolation can be used in passive compensation [14,15] . Another improved way to passively compensate for phase drift is to find the environment temperature of interferometers, at which the difference between the modal phase shifts in the long and short arms of the AMZI (ș L ș S ) is multiples of 2ʌ [16] .…”

Section: Quantum Informationmentioning

confidence: 99%