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Chinese Physics Letters

Engineering of Multi-Dimensional Entangled States of Photon Pairs Using Hyper-Entanglement

任希锋, 郭国平, 李剑, 李传锋, 郭光灿

Published Jan 1, 2006• 0 citations
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Abstract

多维的纠缠的状态被证明了在一些量信息处理更强大。从自发的 parametricdown 变换的下面变换的光子被用来设计多维的纠缠的状态。一种 multi-degreemulti-dimensional Greenberger-Horne-Zeilinger 状态能也被产生。hyper-entangledphotons 在精力时间，极化和轨道的尖动量被纠缠，它被证明有用增加系统的尺寸并且调查高度维的纠缠的状态。

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多维的纠缠的状态被证明了在一些量信息处理更强大。从自发的 parametricdown 变换的下面变换的光子被用来设计多维的纠缠的状态。一种 multi-degreemulti-dimensional Greenberger-Horne-Zeilinger 状态能也被产生。hyper-entangledphotons 在精力时间，极化和轨道的尖动量被纠缠，它被证明有用增加系统的尺寸并且调查高度维的纠缠的状态。
Multi-dimensional entangled states have been proven to be more powerful in some quantum information processes. Down-converted photons from spontaneous parametric down-conversion are used to engineer multi-dimensional entangled states. A kind of multi-degree multi-dimensional Greenberger–Horne–Zeilinger states can also be generated. The hyper-entangled photons are entangled in energy-time, polarization and orbital angular momentum, which is proven to be useful to increase the dimension of systems and to investigate higher-dimensional entangled states.
By exploiting both the photons’ polarization and spatial degrees of freedom, we experimentally demonstrate a hyper-entangled four-photon six-qubit Greenberger-Horne-Zeilinger (GHZ) state. Based on the state, we experimentally test the multi-particle Ardehali inequality and prove the theoretical prediction of Ardehali. Furthermore, we experimentally first investigate the robustness of the Ardehali inequality for the four-photon six-qubit GHZ state in a bit-flip noise environment and show the good robustness against decoherence for this inequality. Our works provide an experimental benchmark to estimate the safety of quantum channel in the noisy environment.