Observation of Entanglement between Two Light Beams Spanning an Octave in 
Optical Frequency

Grosse, Nicolai B.; Assad, Syed; Mehmet, Moritz; Schnabel, Roman; Symul, Thomas; Ping, Koy Lam

doi:10.1103/PhysRevLett.100.243601

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Observation of Entanglement between Two Light Beams Spanning an Octave in Optical Frequency

MPS-Authors

Mehmet, Moritz
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Schnabel, Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Citation

Grosse, N. B., Assad, S., Mehmet, M., Schnabel, R., Symul, T., & Ping, K. L. (2008). Observation of Entanglement between Two Light Beams Spanning an Octave in Optical Frequency. Physical Review Letters, 100(24): 243601. doi:10.1103/PhysRevLett.100.243601.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-633B-4

Abstract

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.