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arXiv:2407.07588 · IEEE/LEOS Summer Topical Meetings

Detection of Broadband Squeezed Light with a Low-Noise Die-Level Balanced Receiver

Emmily Zaiser, Alessandro Trenti, Dinka Milovančev, Nemanja Vokić, Bernhard Schrenk, Hannes Hübel

Published Jul 15, 2024• 2 citations
arXivHTMLPDF

Abstract

The generation and detection of squeezed light through spontaneous parametric down-conversion in a nonlinear crystal up to a frequency of 3.5 GHz is presented. We characterize the quantum state with balanced homo dyne detection, leveraging a low-noise die-level receiver.
DOI
10.1109/sum60964.2024.10614551

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Measurements of quantum-noise reduction have been performed over a broad frequency range up to 0.5 GHz using pulses of squeezed light generated by parametric amplification in KTiOPO4{\mathrm{KTiOPO}}_{4}KTiOPO4​ crystals. Both balanced-homodyne and direct-difference photodetection schemes were employed, and 0.5 dB of noise reduction was routinely obtained. A continuous-mode traveling-wave theory including the effects of dispersion and loss has been employed to model the experimental results.