Year: 2008
Type: article
Abstract: We report a demonstration of quantum key distribution (QKD) at gigahertz 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 2.37Mbit∕s at 5.6km and 27.9kbit∕s at 65.5km when the fiber dispersion is not compensated. After compensating the fiber dispersion, the QKD distance is extended to 101km, resulting in a secure key rate of 2.88kbit∕s. Our results suggest that InGaAs APDs are very well suited to gigahertz QKD applications.
Source: Applied Physics Letters
DOI: 10.1063/1.2931070
Authors: Z. L. Yuan, A. R. Dixon, J. F. Dynes, A. W. Sharpe, A. J. Shields
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2040183751