Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 39: Poster: Quantum Optics and Photonics II
Q 39.15: Poster
Tuesday, March 6, 2018, 16:15–18:15, Zelt Ost
Temporal-mode selective purification and manipulation of multimode quantum light — Vahid Ansari1, •John Matthew Donohue1, Markus Allgaier1, Linda Sansoni1, Benjamin Brecht1,2, Jonathan Roslund3, Nicolas Treps3, Georg Harder1, and Christine Silberhorn1 — 1Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn — 2Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom — 3Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, 75252 Paris, France
In order to fully exploit the time-frequency degree of freedom for photonic quantum information science, it is necessary to develop and demonstrate techniques which can manipulate the temporal structure of multimode quantum light without introducing excess noise. In this work, we experimentally demonstrate such a technique using shaped ultrafast pulses and dispersion-engineered frequency conversion as a quantum pulse gate. We controllably select broadband field-orthogonal (i.e. intensity overlapping) modes out of a multimode downconverted photon state, converting the specified mode from the infrared to the visible regime while leaving the unselected modes unaffected. Through photon-number correlation measurements, we show that such a technique selects a single mode with high purity (above 95%) and low noise (SNRs above 70). We also show through the photon-number correlations that our device can be used to both purify and redistribute the coefficients of a multimode photon state.