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arXiv:0910.4038 · Nature Photonics

From quantum multiplexing to high-performance quantum networking

William J. Munro, K. A. Harrison, Ashley M. Stephens, Simon J. Devitt, Kae Nemoto

Published Aug 29, 2010• 215 citations
arXivHTMLPDF
DOI
10.1038/nphoton.2010.213

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Dense wavelength division multiplexing (DWDM) is one of the most successful methods for enhancing data transmission rates in both classical and quantum communication networks. Although signal multiplexing and demultiplexing are equally important, traditional multiplexing and demultiplexing methods are based on passive devices such as arrayed waveguides and fiber Bragg cascade filters, which, although widely used in commercial devices, lack any active tuning ability. In this work, we propose a signal demultiplexing method based on sum frequency generation (SFG) with two significant features: first, any signal from the common communication channel can be demultiplexed to a single user by switching the pump wavelength; second, a cheap high-performance detector can be used for signal detection. These two features were demonstrated by demultiplexing multi-channel energy-time entanglement generated by a micro-cavity silicon chip. High interference visibilities over three channels after demultiplexing showed that entanglement was preserved and verified the high performance of the demultiplexer, which will find wide application in high-capacity quantum communication networks.
In order to reduce construction cost of quantum key communication network,the quantum communication network in the environment of channel multiplexing is analyzed. Aiming at the current classical quantum channel multiplexing scheme,the schemes of wavelength isolation and the similar wavelength transmission are modeled respectively,and the system performances also simulated and calculated. Analysis shows that the scheme of wavelength isolation is fairly feasible,performs fairly well in short- haul communication,and is suitable for short- distance intensive local area network. The scheme of similar wavelength has a fairly high requirement of channels isolation and however,but it is more suitable for classical optical networks with even longer communication distance. And this could serve as a reference program for constructing quantum key metropolitan area network.