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International Conference on Correlation Optics

Single photon detector on avalanche photodiode

Петро Шпатар, Oleksandr Hres, Heorhii Rozorinov, Andrij Veryga

Published Dec 21, 2021• 2 citations
Publisher

Abstract

The technology of quantum cryptography, based on the quantum properties of light, allows a random sequence of bits to be transmitted over an unprotected communication channel in such a way that an intruder's interference in the transmission process generates additional noise in the channel and is detected by legitimate users. One of the important elements of the quantum key distribution system is a single photon detector. In this work proposed quantum cryptographic system that generates only an orthogonal basis (vertical and horizontal) has one semiconductor diode laser used to generate information and synchronization photons and functional diagram of the device for registration of single photons. The developed device allows increasing the quantum efficiency of registration up to 45%.

DOI
10.1117/12.2615626

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The technology of quantum cryptography, based on the quantum properties of light, allows a random sequence of bits to be transmitted over an unprotected communication channel in such a way that an intruder's interference in the transmission process generates additional noise in the channel and is detected by legitimate users. One of the important elements of the quantum key distribution system is a single photon detector. In this work proposed quantum cryptographic system that generates only an orthogonal basis (vertical and horizontal) has one semiconductor diode laser used to generate information and synchronization photons and functional diagram of the device for registration of single photons. The developed device allows increasing the quantum efficiency of registration up to 45%.
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In our experiment, two InGaAs/InP avalanche photodiodes (APD) were used in the quantum key distribution (QKD) system for single-photon detection at telecom communication wavelength (1310/1550 nm). By using properly designed passive-quenching circuit, the photo-detection efficiency of the APD could reach 10% at 1550 nm. In order to decrease the dark count rate efficiently, we designed a coincident counting circuits for single-photon detection. Before the APD signals were sent to the signal processing circuit, the avalanche signals were amplified and shaped into the TTL pulses. In order to obtain an accurate and efficient data acquisition and to transfer synchronically several signals such as the TTL signals and pulses from Random generators, we designed a signal processing circuit with the parallel port whose speed limitation is about 100Kb/s. In our experiments of single-photon interference and quantum cryptography, the electronic designs presented us satisfactory performance and results. To achieve much higher speed for the data acquisition, we also employed the Universal Serial Bus System (USB2.0) to interface our single-photon avalanche detectors and random generators used in our QKD system, which was believed to improve the performance of QKD such as the key distribution speed.