Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 61: Quanteninformation (Photonen und nichtklassisches Licht II)

Q 61.2: Talk

Friday, March 14, 2008, 14:15–14:30, 1A

Improved methods for Polarization squeezing with photonic crystal fibers — •Josip Milanovic¹, Alexander Huck², Joel Heersink¹, Christoph Marquardt¹, Ulrik L. Andersen², and Gerd Leuchs¹ — ¹Institute of Optics, Information and Photonics, Max-Planck Research Group, University of Erlangen-Nuremberg, Guenther-Scharowsky-Straße 1, 91058, Erlangen, Germany — ²Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

Squeezing or quantum noise reduction of optical states in glass fibers has been chronically afflicted by the large phase noise from Guided Acoustic Wave Brillouin Scattering (GAWBS). This excess noise is one of the main effects that decrease the purity of the quantum states. In previous experiments we have already shown that Photonic Crystal Fibers (PCFs) represent a promising new approach to reduce this noise.
At a squeezing level of −3.3±0.3 dB at 810 nm the purity of the squeezed state was three times higher than in experiments with standard telecom fibers. A major problem is that the dispersion properties for different axes are not identical. Due to the different spectral evolution of the pulses in the PCFs the interference of squeezed pulses is very low which implies a large loss in the detectable squeezing. We present improved methods which can be used to increase and detect higher levels of polarization squeezing.