Heterodyne-based subcarrier wave quantum cryptography under the chromatic dispersion impact

Abstract

In this paper, we investigate the effect of chromatic dispersion on a continuous variable quantum key distribution system with heterodyne detection, in which information is encoded in the sidebands of modulated laser radiation. We consider the system in which a balanced detector output is downconverted to an intermediate frequency and propose a non-standard methods of dispersion compensation using RF phase shifters.

Coherent Detection of Discrete Variable Quantum Key Distribution using Homodyne Technique

“…Heterodyne detection is another type of coherent detection method where the carrier signal and local oscillator have different frequencies. [21][22][23]. This technique is an improvement on the traditional homodyne system and allows for the simultaneous detection of two field quadratures in one measurement [24].…”