Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quanteninformation (Photonen und nichtklassisches Licht I)

Q 2.7: Vortrag

Montag, 19. März 2007, 12:00–12:15, 5L

Polarization squeezing with photonic crystal fibers — •Josip Milanovic¹, Alexander Huck¹, Joel Heersink¹, Christoph Marquardt¹, Ulrik Andersen^1,2, 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). Photonic Crystal Fibers (PCFs) represent a promising new approach to reduce this noise.

We report on the generation of polarization squeezed states employing intense, ultrashort light pulses by a single pass method in photonic crystal fibers. We investigated the squeezing behavior near the zero-dispersion wavelength and in the anomalous dispersion regime by using two distinct fibers. We observed a maximal squeezing at 810 nm of −3.3±0.3 dB with an excess noise of +16.8±0.3 dB in the anomalous regime. Correcting for linear and interference losses between the polarization modes, this corresponds to −6±1 dB of squeezing. The ratio of the squeezing to the excess noise indicates the creation of a much purer state in comparison to a standard fiber; this ratio indeed lies an order of magnitude below those of squeezing experiments exploiting traditional fibers.