Phys. Rev. A 76, 012314 (2007) [9 pages]Experimental generation of broadband quadrature entanglement using laser pulsesReceived 25 April 2007; published 16 July 2007 We report on the generation of broadband pulsed quadrature entanglement by combining two squeezed vacua, which are generated from two degenerate optical parametric amplifiers (OPAs), on a beam splitter. With a single pass through OPA, in which a periodically poled lithium niobate waveguide is used as a nonlinear material, the noise reduction of 3.4±0.2 dB below the shot noise limit is observed with a bandwidth of more than 200 MHz. The entanglement correlation or EPR correlation is confirmed with a sufficient criterion ⟨Δ2(Xa+Xb)⟩+⟨Δ2(Ya−Yb)⟩=1.28<2. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.76.012314
DOI:
10.1103/PhysRevA.76.012314
PACS:
03.67.Dd, 42.50.Dv, 42.25.−p
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