Abstract

Implementing CVQKD using integrated photonics presents many advantages, such as small form factor, and the ability to mass manufacture at a high volume with a lost cost, by making use of mature electronics manufacturing technologies. Another significant advantage of using integrated photonics is for implementing CV-QKD receivers. By making use of integrated photodiodes with integrated amplification electronics it is possible to achieve high-performance wideband (GHz) homodyne detectors [1], using standard telecoms electronics at negligible cost ($10s). Increasing the detector bandwidths allows for faster baud rates, and therefore faster key rates [2]. In this work we implement a hybrid integrated photonic/electronic circuit design to demonstrate an integrated photonic CV-QKD receiver with a bandwidth of approximately 1.4GHz and our work towards making use of the design to implement a CV-QKD system with GHz baud rates. This represents an improvement in bandwidth of 2 orders of magnitude over previous chip-based CV-QKD experiments where the bandwidth of the detector was 10MHz. [2]

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