2006/11/01 by Alfred B. U'Ren, Alfred B. U’Ren, Reinhard Erdmann +4 · 70 citations
Engineering · Mathematics · Physics and Astronomy · #Advanced Fiber Laser Technologies #Interferometry #Mathematics #Nonlinear system #Parametric statistics #Photon #Photonic and Optical Devices #Physics #Quantum #Quantum entanglement #Quantum mechanics #Quantum optics #Quantum optics and atomic interactions #Quantum state #Spontaneous parametric down-conversion #Statistical physics #Superlattice #quant-ph
paper · pdf · doi:10.1103/physrevlett.97.223602
published in Physical Review Letters 97(22), 223602 (American Physical Society) · 4 pages, 4 figures, accepted Phys. Rev. Lett
arxiv created 2006/11/01 · openalex publication_date 2006/11/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We demonstrate a general method of engineering the joint quantum state of photon pairs produced in spontaneous parametric down-conversion. The method makes use of a superlattice structure of nonlinear and linear materials, in conjunction with a broadband pump, to manipulate the group delays of the signal and idler photons relative to the pump pulse, and realizes photon pairs described by a joint spectral amplitude with arbitrary degree of entanglement. This method of group-delay engineering has the potential of synthesizing a broad range of states including factorizable states crucial for quantum networking and states optimized for Hong-Ou-Mandel interferometry. Experimental results for the latter case are presented, illustrating the principles of this approach.