Ultra-Low Noise Balanced Receiver with >20 dB Quantum-to-Classical Noise Clearance at 1 GHz

TL;DR

This paper presents a die-level balanced homodyne receiver with ultra-low noise and high quantum-to-classical noise clearance at 1 GHz, enabling high-sensitivity quantum optical communication.

Contribution

It introduces a novel balanced receiver achieving over 20 dB quantum-to-classical noise clearance and high CMRR at 1 GHz, suitable for quantum applications.

Findings

40 dB CMRR up to 1 GHz

26.8 dB quantum-to-classical noise ratio at 12.3 mW LO power

500 Mb/s QPSK transmission with -55.8 dBm sensitivity

Abstract

We demonstrate a die-level balanced homodyne receiver for coherent optical access and continuous-variable quantum applications, featuring a 40dB CMRR up to 1GHz and a high quantum-to-classical noise ratio of 26.8dB at 12.3mW of LO power. 500Mb/s QPSK transmission was accomplished with a sensitivity of -55.8dBm.