2013/04/08 by Jibo Dai, Yink Loong Len, Yong Siah Teo +3 · 6 citations
Computer Science · Physics and Astronomy · #Cluster state #Continuous variable #Parametric statistics #Photon #Photorefractive and Nonlinear Optics #Physics #Polarization (electrochemistry) #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum mechanics #Spontaneous parametric down-conversion #Statistics #quant-ph
paper · pdf · doi:10.1088/1367-2630/15/6/063011
published in New Journal of Physics 15(6), 063011 (IOP Publishing) · submitted for publication
arxiv created 2013/04/08 · openalex publication_date 2013/06/10 · arxiv updated 2015/10/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report a controllable method for producing mixed two-photon states via spontaneous parametric down-conversion with a two-type-I crystal geometry. By using variable polarization rotators (VPRs), one obtains mixed states of various purities and degrees of entanglement depending on the parameters of the VPRs. The generated states are characterized by quantum state tomography. The experimental results are found to be in good agreement with the theory. The method can be easily implemented for various experiments that require the generation of states with controllable degrees of entanglement or mixedness.