Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster I
Q 23.38: Poster
Dienstag, 12. März 2024, 17:00–19:00, Tent B
Quantum pulse gate conversion efficiency — •Dana Echeverría-Oviedo1, Hiroko Tomoda2, Felix Moor1, Michael Stefszky1, Benjamin Brecht1, and Christine Silberhorn1 — 1Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany. — 2Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
The quantum pulse gate (QPG) is a dispersion-engineered guided-wave device, based on sum-frequency generation (SFG) between spectrally shaped light pulses. It can implement time-frequency mode-selective projections of single photons on user-defined modes. These are useful for quantum applications in, e.g., metrology, communications and simulations, where high efficiencies are crucial. The SFG conversion efficiency η, that is the ratio between the number of upconverted photons over the number of input photons (assuming no pump depletion and neglecting propagation losses), is given by η = sin2(√ηnorm Pp L), where ηnorm is η normalized per pump power Pp and sample length L. Considering identical experimental conditions (geometry and material of the waveguide; spatial, temporal and spectral overlap; and pulse characteristics) to increase η it is necessary to increase L, which is a challenge due to the accumulation of fabrication inhomogeneities of longer samples. In this work, we measured η of a 71 mm long QPG, the longest reported until now, which reaches η of up to 64% for a Pp of only 12.5 mW. Here, we report on the progress of the project.
Keywords: SFG; QPG; High-efficiency; Temporal modes; Pulsed ligth