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Chinese Physics Letters

A Wavelength-Tunable Fiber-Coupled Narrow-Band Twin-Photon Source

黄建发, 柳必恒, 方彬, 黄运锋, 郭光灿

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

我们在场产生的波长悦耳的狭窄乐队的联合纤维的来源相关在 539nm 和 1550nm 的光子对。用 10 公里 PPLN 晶体，我们在 1550nm 附近多于 50mm 获得悦耳的范围。这来源，给它的光谱性质和悦耳的性质，很好在光纤的量通讯和密码学网络适合任务。

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Most quantum communication protocols rely on the distribution of entangled photon pairs. If the transmission channel is an optical fiber both photons should have a wavelength around 1550nm. We present a source of polarisation entanglement based on spontaneous parametric down-conversion (SPDC) at telecom wavelengths. Using fiber-pigtailed ppLN crystals we can profit from the clean χ2SPDC process, as opposed to four-wave mixing techniques, and also from a stable and efficient coupling to single mode fibers. Using a cw-pump, a tight energy correlation between the entangled photons is achieved. This fact is used here to distribute the entanglement through multiple channels employing only passive wavelength multiplexing. We demonstrate a possible application scenario with a single central source distributing entanglement to four users simultaneously. The source can also be used for creating tri-partite entanglement using the recently demonstrated cascaded SPDC scheme.