Design Of Long Wavelength InN Single-photon Detection System Used In Quantum Cryptography Communication

Cryptography is the subject study of the secure communication. Quantum cryptography (QC) is the combination of classical cryptography and quantum mechanics. The characteristics of quantum mechanics, such as no-cloning theorem and Heisenberg's uncertainty principle, provide the perfect secrecy for quantum cryptographic communication. Being the first application of quantum physics, quantum key distribution has been developed very fast experimentally in recent years. It would impact thoroughly the existing secure communication, especially in military affairs, e-banking and so on.Important elements used in optical quantum information processing are single-photon detectors and sources. Due to the great application potential and the secrets of the characters having been revealed, the InN material is one of the most attractive materials by way of single-photon sources in recent two years. In this paper, the basic properties of InN were introduced. The growth techniques and applications of InN material were discussed. Finally, some questions and the prospect of the InN material in the future were given. InN films with low-temperature InN buffer layer are successfully grown on sapphire substrates by radio-frequency plasma-excited molecular beam epitaxy. A single-photon detection system with laser of the 1 310nm wavelength as light source is designed.