2006/09/15 by K. Yoshino, Ken-ichiroh Yoshino, Takao Aoki +1 · 1 citation
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Photonic and Optical Devices #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1063/1.2437057
published as Appl. Phys. Lett. 90, 041111 (2007) · 4 pages, 3 figures
arxiv created 2006/09/15 · openalex publication_date 2007/01/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Continuous-wave light beams with broadband quantum entanglement are created with two independent squeezed light beams generated by two periodically poled lithium niobate waveguides and a symmentric beam splitter. The quantum entanglement is confirmed with a sufficient criterion ΔA,B2=⟨[Δ(x̂A−x̂B)]2⟩+⟨[Δ(p̂A+p̂B)]2⟩<1 and the observed ΔA,B2 is 0.75 over the bandwidth of 30MHz. Although the bandwidth is limited by that of the detector so far, it would be broadened up to 10THz which would be only limited by the bandwidth of phase matching for the second-order nonlinear process.