Continuous variable entanglement between frequency modes

✍ Scribed by O. Glöckl; U.L. Andersen; G. Leuchs

• Book ID: 105357562
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 358 KB
• Volume: 54
• Category: Article
• ISSN: 0015-8208
• DOI: 10.1002/prop.200610309

✦ Synopsis

Abstract

The pairwise production of photons in nonlinear optical processes ensures entanglement to occur between two photons. E.g. when the Kerr effect is exploited, the photons are produced in different frequency modes, which are symmetric with respect to the pump frequency. Since these photons are produced into the same spatial mode, the quadrature entanglement can be witnessed only by the use of a frequency selective device which transforms the adjacent frequency modes into two different spatial modes. We use a Mach‐Zehnder interferometer with a large path length difference to separate symmetric frequency modes located 10.25 MHz from the carrier. We measure correlations of the quadrature components of 1.6 ± 0.1dB below the shot noise in the amplitude and 1.4 ± 0.1dB in the phase.