Monolithically Integrated Switchable Optical Receiver for Classical and Quantum Communication

In this work we propose a switchable dual bandwidth optical receiver that can be used for both classical and continuous variable quantum key distribution (CV-QKD) on a monolithic platform for opto-electronic integration. Switchable transimpedance amplifier is designed for dual bandwidth that can be switched between high bandwidth (10 GHz) for classical and low bandwidth (>1.5GHz) for quantum communication. Monolithic approach allows integration of photonics on the same chip which allows for low-noise operation as well as reconfigurable configuration between a simple link for on-off keying used for classical and optical heterodyne coherent reception used for quantum communication. The receiver performance for both classical and quantum application is simulated showing very high sensitivity as well as high secure key rates over moderate distances.