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IEICE Technical Report; IEICE Tech. Rep.

Fast Quantum Cryptography System using Single Photon Communication

Akio Tajima, Akihiro Tanaka, Y. Nambu, 和佳子 前田, Yoshino Ken-ichiro, Seigo Takahashi, Tomita Akihisa

Published Jun 5, 2008• 0 citations
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A single-photon detection system with laser of 1310nm wavelength as light source is designed. Using InGaAs Avalanche Photodiode (InGaAs-APD) as single-photon detection device for quantum cryptography communication, the bias-voltage formation, low-temperature control and single-photon signal detection are comprehensively considered. The photon gate formed by pulse superimposed on DC level is equivalently performed by monostable circuit in pulse generator. Detection sensitivity of the system is improved by using a trans-impedance pre-amplifier and a precision comparator. The detection experiments in initial stage show that the waveform of -93dBm light signal can be observed by the detection system.

Guangdian gongcheng•Jan 1, 2004•1 citation
Contemporary implementations of Quantum Key Distribution are based on BB84, first proposed in 1984, and commercially implemented for limited market applications in the early 2000s. A major limitation of BB84 is that it requires no more than a single photon per time slot. But no device can reliably generate single photons with guaranteed periodicity. In this paper, we address the practical issues of realizing quantum cryptography systems. In particular, we address the major shortcomings of quantum cryptography as practiced today - the limitation of requiring a single photon to be used in communication. This not only affects the security of the practical quantum cryptography systems, but also restricts the distance over which secure keys can be sent and their rate. Our approach is not limited to a single photon per time-slot thus making it possible to send keys faster and over longer distances. The paper discusses the innate nature of multi-photon communication protocols as a surrogate for quantum communication while giving it a cryptographic strength that would closely match that of a pure quantum communication system.
Quantum Key Distribution (QKD) systems based on single photon transmission can generate unconditionally secure common key between remote users. Improvement of QKD performance, particularly on key generation rate, has been required to meet current network traffic. High key generation rate is realized by increasing photon detection rate and by reducing error rate. Therefore, a high-speed QKD system should be equipped with low loss receivers with high visibility, highly efficient photon detectors with small dark count probability, and a stable clock synchronization system with low stray light to the quantum signals. A solution for these issues are given by employing planar lightwave circuit interferometers, single photon detection circuits and modules, and clock synchronization based on Wavelength Division Multiplexing (WDM) technique.
A single-photon detection system with laser of 1310nm wavelength as light source is designed. Using InGaAs Avalanche Photodiode (InGaAs-APD) as single-photon detection device for quantum cryptography communication, the bias-voltage formation, low-temperature control and single-photon signal detection are comprehensively considered. The photon gate formed by pulse superimposed on DC level is equivalently performed by monostable circuit in pulse generator. Detection sensitivity of the system is improved by using a trans-impedance pre-amplifier and a precision comparator. The detection experiments in initial stage show that the waveform of -93dBm light signal can be observed by the detection system.