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Measurement of the entanglement between photonic spatial modes in optical fibers
Yoonshik Kang1, Jaekwon Ko, Sang Min Lee
1Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea.
Physical Review Letters
|October 4, 2012
Abstract:
We experimentally demonstrate the entanglement of spatial modes between two photons propagating through separate few-mode optical fibers. Quantum states over the two lowest-order spatial modes are measured with highly efficient spatial-mode analyzers based on acousto-optics. Quantum state tomography verifies the entanglement of the spatial-domain Bell state.

