Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantum information: Photons and nonclassical light I
Q 38.2: Vortrag
Donnerstag, 20. März 2014, 10:45–11:00, UDL HS3038
Narrow band photon pairs linked to a solid state quantum memory suited for quantum repeaters. — •Daniel Rieländer1, Kutlu Kutluer1, Patrick Ledingham1, Mustafa Gündoğan1, Julia Fekete1, Margherita Mazzera1, and Hugues de Riedmatten1,2 — 1ICFO - The Istitute of Photonic Science, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain — 2ICREA - Institució Catalana de Recerca i Estudis Avançats, 08015 Barcelona, Spain
We create photon pairs where one photon is stored in a praseodymium (Pr3+) doped crystal for up to 4.5 µ s and its associate photon is at telecom wavelength. This combination is ideally suited for quantum repeaters to overcome limitations in long distance quantum communication. The photon pair source is based on cavity enhanced spontaneous parametric down conversion (SPDC). Widely non degenerate photon pairs at 606 nm and 1436 nm wavelength are created inside a bow-tie cavity. The output rate is enhanced inside the cavity modes and double resonance leads to a strong reduction of redundant modes due to the clustering effect. This brings a high spectral brightness with few spectral modes of 2 MHz line width. Quantum storage of heralded photons at 606 nm has been demonstrated using the atomic frequency comb protocol in a Pr:YSO crystal at cryostatic temperature. A storage time up to 4.5 µ s has been achieved, the longest storage time in solid state devices. We will discuss further experiments on the quantum light source, e.g. the variation of the emitted number of modes by setting dispersive elements inside the cavity.