Homodyne detection for pulse-by-pulse squeezing measurement
Tiphaine Kouadou, Elie Gozlan, Loïc Garcia, David Polizzi, David Fainsin, Iris Paparelle, R. L. Rincón Celis, Bastien Oriot, Anthony Abi Aad, Peter Namdar, Ganaël Roland, Nicolas Treps, Bérengère Argence, Valentina Parigi · New Journal of Physics · 2026
Abstract Homodyne detection is a phase-sensitive measurement technique, essential for the characterization of continuous-variable (CV)-encoded quantum states of light. It is a key component to the implementation of CV quantum-information protocols and benefits from operating, by design, at room temperature. However, performing high-speed quantum information processing remains a major challenge, as conventional homodyne detectors often fail to sustain pulsed operation at high repetition rates due to electronic limitations. We present wideband homodyne detectors operating at near-infrared and telecom wavelengths, with optimized performance at repetition rates up to 150 MHz. We demonstrate their performance by resolving the pulse-by-pulse structure of squeezed states of light at telecom wavelengths while preserving their spectral multimode properties.