Observation of entanglement between two light beams spanning an octave in optical frequency

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

doi:10.1103/PhysRevLett.100.243601

Observation of entanglement between two light beams spanning an octave in optical frequency

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

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43 Citations (Scopus)

Abstract

We have experimentally demonstrated how two beams of light separated by an octave in frequency can become entangled after their interaction in a χ(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.

Original language	English
Article number	243601
Journal	Physical Review Letters
Volume	100
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.100.243601
Publication status	Published - 18 Jun 2008

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abstract = "We have experimentally demonstrated how two beams of light separated by an octave in frequency can become entangled after their interaction in a χ(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.",

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AU - Assad, Syed

AU - Mehmet, Moritz

AU - Schnabel, Roman

AU - Symul, Thomas

AU - Lam, Ping Koy

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N2 - We have experimentally demonstrated how two beams of light separated by an octave in frequency can become entangled after their interaction in a χ(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.

AB - We have experimentally demonstrated how two beams of light separated by an octave in frequency can become entangled after their interaction in a χ(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.

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Observation of entanglement between two light beams spanning an octave in optical frequency

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