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This research presents a significant hardware advancement by integrating a low-noise balanced homodyne detector directly onto a silicon photonics platform using standard CMOS processes. The demonstrated high bandwidth and shot noise clearance metrics validate the viability of this architecture for critical quantum applications like continuous-variable quantum key distribution and optical coherence tomography.
Integrated balanced homodyne detector using CMOS capacitive-feedback TIA for quantum measurements
arXiv:2609.37671v1 Announce Type: new Abstract: A low-noise, high-speed balanced homodyne detector is demonstrated, combining a capacitive-feedback transimpedance amplifier implemented in 28 nm CMOS with a custom photonic integrated circuit fabricated in imec's iSiPP200 silicon photonics platform. The receiver achieves a 3-dB bandwidth of 7.6 GHz, a maximum shot noise clearance of 27 dB, a shot noise-limited bandwidth of 13.7 GHz and a common-mode rejection ratio up to 54.8 dB. These results demonstrate the suitability of CMOS capacitive-feedback transimpedance amplifiers for demanding quantum and coherent sensing optical applications, including continuous-variable quantum key distribution, quantum random number generation, and optical coherence tomography.
Abstract:A low-noise, high-speed balanced homodyne detector is demonstrated, combining a capacitive-feedback transimpedance amplifier implemented in 28 nm CMOS with a custom photonic integrated circuit fabricated in imec's iSiPP200 silicon photonics platform. The receiver achieves a 3-dB bandwidth of 7.6 GHz, a maximum shot noise clearance of 27 dB, a shot noise-limited bandwidth of 13.7 GHz and a common-mode rejection ratio up to 54.8 dB. These results demonstrate the suitability of CMOS capacitive-feedback transimpedance amplifiers for demanding quantum and coherent sensing optical applications, including continuous-variable quantum key distribution, quantum random number generation, and optical coherence tomography.
This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible
arXiv:2609.37671 [quant-ph]
(or arXiv:2609.37671v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2609.37671 arXiv-issued DOI via DataCite (pending registration)
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