Gigahertz quantum key distribution with InGaAs avalanche photodiodes
Z. L. Yuan, A. R. Dixon, J. F. Dynes, A. W. Sharpe, and A. J. Shields
TL;DR
This paper demonstrates GHz-rate quantum key distribution using InGaAs avalanche photodiodes operating in self-differencing mode, achieving secure key rates over distances up to 101 km with suppressed afterpulse noise.
Contribution
It introduces a GHz QKD system utilizing InGaAs APDs in self-differencing mode, extending operational distances and improving secure key rates.
Findings
Secure bit rate of 2.37 Mbps at 5.6 km
Secure bit rate of 27.9 kbps at 65.5 km
Extended QKD distance to 101 km after fiber dispersion compensation
Abstract
We report a demonstration of quantum key distribution (QKD) at GHz clock rates with InGaAs avalanche photodiodes (APDs) operating in a self-differencing mode. Such a mode of operation allows detection of extremely weak avalanches so that the detector afterpulse noise is sufficiently suppressed. The system is characterized by a secure bit rate of 2.37 Mbps at 5.6 km and 27.9 kbps at 65.5 km when the fiber dispersion is not compensated. After compensating the fiber dispersion, the QKD distance is extended to 101 km, resulting in a secure key rate of 2.88 kbps. Our results suggest that InGaAs APDs are very well suited to GHz QKD applications.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.