Shot-Noise Limited Homodyne Detection for MHz Quantum Light Characterisation in the 2 μm Band

Abstract

Characterising quantum states of light in the 2 $\mu m$ band requires high-performance shot-noise limited detectors. Here, we present the characterisation of a homodyne detector that we use to observe vacuum shot-noise via homodyne measurement with a 2.07 $\mu m$ pulsed mode-locked laser. The device is designed primarily for pulsed illumination. It has a 3 dB bandwidth of 13.2 MHz, total conversion efficiency of 58% at 2.07 $\mu m$ and a common-mode rejection ratio of 48 dB at 39.5 MHz. The detector begins to saturate at 1.8 mW with 9 dB of shot-noise clearance at 5 MHz. This demonstration enables the characterisation of megahertz-quantum optical behaviour in the 2 $\mu m$ band.

7 pages, 2 figures and 1 table

References in corpus (3)

• A squeezed quantum microcomb on a chip
• Experimental Proof of Nonlocal Wavefunction Collapse for a Single Particle Using Homodyne Measurement
• Mid-infrared homodyne balanced detector for quantum light characterization