2008/03/26 by Nicolai B. Grosse, Syed M. Assad, Syed Assad +4 · 45 citations
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Amplitude #Homodyne detection #Mechanical and Optical Resonators #Octave (electronics) #Optics #Phase (matter) #Photonic and Optical Devices #Physics #Quantum #Quantum entanglement #Quantum mechanics #Resonator #Wavelength #quant-ph
paper · pdf · doi:10.1103/physrevlett.100.243601
published in Physical Review Letters 100(24), 243601 (American Physical Society) · 4 pages, 4 figures
arxiv created 2008/03/26 · openalex publication_date 2008/06/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have experimentally demonstrated how two beams of light separated by an octave in frequency can become entangled after their interaction in a chi;(2) nonlinear medium. The entangler was a nonlinear optical resonator that was strongly driven by coherent light at the fundamental and second-harmonic wavelengths. An interconversion between the fields created quantum correlations in the amplitude and phase quadratures, which were measured by two independent homodyne detectors. Analysis of the resulting correlation matrix revealed a wave function inseparability of 0.74(1)<1, thereby satisfying the criterion of entanglement.