外文翻譯---用于量子密鑰的單光子apd探測器設(shè)計-其他專業(yè)(已修改)
2025-02-04 09:40 本頁面
【正文】 Design and Characterization of Single Photon APD Detector for QKD Application Abstract Modeling and design of a single photon detector and its various characteristics are presented. It is a type of avalanche photo diode (APD) designed to suit the requirements of a Quantum Key Distribution (QKD) detection system. The device is modeled to operate in a gated mode at liquid nitrogen temperature for minimum noise and maximum gain. Different types of APDs are pared for best performance. The APD is part of an optical munication link, which is a private channel to transmit the key signal. The encrypted message is sent via a public channel. The optical link operates at a wavelength of . The design is based on InGaAs with a quantum efficiency of more than 75% and a multiplication factor of 1000. The calculated dark current is below 1012A with an overall signal to noise ratio better than 18dB. The device sensitivity is better than 40dBm, which is more than an order of magnitude higher than the dark current, corresponding to a detection sensitivity of two photons in picosecond pulses. I. INTRODUCTION Photon detectors sensitive to extremely low light levels are needed in a variety of applications. It was not possible to introduce these devices mercially several years ago because of the stringent requirements of QKD. Research efforts however resulted in photon detectors with reasonably good performance characteristics. The objective here is to model a single photon detector of high sensitivity, suitable for a QKD system. The detector is basically an APD, which needs cooling to very low temperature (77K) for the dark current to be low. The wavelength of interest is . Different applications may impose different requirements, and hence the dependence of the various parameters on wavelength, temperature, responsivity, dark current, noise etc, are modeled. Comparison of the results from calculations based on a suitable model provides amenable grounds to determine the suitability of each type of APD for a specific application. Attacks on munication systems in recent years have bee a main concern acpanying the technological advances. The measures and counter measures against attacks have driven research effort towards security techniques that aim at absolute infallibility. Quantum Mec
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