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arXiv:1612.02915 · Physical Review Applied

On-Chip Multiplexed Multiple Entanglement Sources in a Single Silicon Nanowire

Yin-Hai Li, Zhi-Yuan Zhou, Lan-Tian Feng, Wen-Tan Fang, Shi-long Liu, Shi-Kai Liu, Kai Wang, Xi-Feng Ren, Dong-Sheng Ding, Li-Xin Xu, Bao-Sen Shi

Published Jun 5, 2017• 66 citations
arXivHTMLPDF

Abstract

The silicon-on-insulator waveguide is one of the most promising platforms for scalable quantum information processing. The authors present multiplexed energy-time, time-bin, and polarization-entanglement photon sources from a single silicon nanowire on a chip. These sources offer high brightness and high entanglement quality across more than 10 correlated channels, and are fully compatible with dense-wave-division multiplexing (DWDM). They could be used for quantum key distribution, teleportation, entanglement swapping, and many other applications in quantum communication and computation.

DOI
10.1103/physrevapplied.7.064005

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Silicon photonics is a promising platform to realize the dense and scalable integration required for quantum computing, communication, and sensing. The authors demonstrate a key building block for this platform, a simple, single source of entangled photons, and use it to observe quantum interference on the same chip. This removes the need for clumsy interfacing of multiple photon sources, as in previous studies, and provides a basis for highly scalable photonic circuits that achieve multi-qubit entanglement.
Optical communication systems are able to send the information from one user to another in light beams that travel through the free space or optical fibers, therefore how to send larger amounts of information in smaller periods of time is a long term concern, one promising way is to use multiplexing of photon's different degrees of freedoms to parallel handle the large amounts of information in multiple channels independently. In this work, by combining the wavelength and time division multiplexing technologies, we prepare a multifrequency mode time bin entangled photon pair source at different time slots by using four wave mixing in a silicon nanowire waveguide, and distribute entangled photons into 3 time by 14 wavelength channels independently, which can significantly increase the bit rate compared with the single channel systems in quantum communication. Our work paves a new and promising way to achieve a high capacity quantum communication and to generate a multiple photon nonclassical state.
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