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Q: Fachverband Quantenoptik und Photonik
Q 48: Poster – Quantum Optics, Technologies, and Optomechanics
Q 48.52: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Towards spatial demultiplexed feedforward of photon number states — •Niklas Schröder1, Frederik Thiele1,2, Niklas Lamberty1,2, Thomas Hummel2, Sebastian Lengeling3, Christof Eigner2, Christine Silberhorn3, and Tim Bartley1,2 — 1Department of Physics, Paderborn University,Warburger Str. 100, Paderborn, 33098, Germany — 2Institute for Photonic Quantum Systems (PhoQS), Paderborn University, Warburger Str. 100, Paderborn, 33098, Germany — 3Integrated Quantum Optics Group, Institute for Photonic Quantum Systems (PhoQS), Paderborn University, Warburger Str. 100, Paderborn, 33098, Germany
Measurement based manipulation of single photons enables many quantum photonic protocols. This can be achieved by measuring incident single photons and then controlling an electro-optic modulator. To do this efficiently, we combine integrated photonics and superconducting nanowire single photon detectors (SNSPD). We are working on a device which sorts heralded Fock states into different spatial modes. We start by measuring the photon number of the idler mode of a spontaneous parametric down-conversion source (SPDC) with a quasiphoton-number-resolving SNSPD. Based on the result, we will route the signal photons in an electro-optic demultiplexer via a cascade of couplers from a single input channel to four output channels, which correspond to a specific Fock state.
Keywords: photon number states; fock states; feedforward; SNSPD