Cavity-Assisted Homodyne Detection with a Single Photodiode
Cavity-assisted homodyne-detection concept from Junker, arXiv 2608.26938 (2026).
Abstract
High-frequency squeezed states are important for quantum metrology and information processing, but quadrature measurements at gigahertz frequencies remain technically demanding. This work proposes cavity-assisted homodyne detection, in which the quantum field and local oscillator enter separate ports of an impedance-matched traveling-wave cavity. The scheme suppresses technical local-oscillator sidebands while enabling near-unity signal-transfer efficiency at moderate incident local-oscillator power. Its usable detection band is set by the cavity linewidth and free spectral range.
Type
Publication
arXiv 2608.26938 (2026)