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A: Fachverband Atomphysik

A 16: Precision Measurements and Metrology IV (joint session Q/A)

A 16.5: Talk

Wednesday, March 16, 2022, 11:45–12:00, Q-H11

Integrated broadband PDC source for quantum metrology — •René Pollmann, Franz Roeder, Matteo Santandrea, Tim Wörmann, Victor Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Straße 100, 33098 Paderborn, Germany

Broadband quantum light is a vital resource for quantum metrology applications such as quantum spectroscopy, quantum optical coherence tomography or entangled two photon absorption. To produce light suitable for these applications we implemented a broadband (10 THz) non-degenerate type-II parametric down conversion source in a 40 mm long periodically poled LiNbO₃ waveguide. The broadband nature of the created photon pairs yields a very short correlation time (100 fs), while the narrowband CW pump ensures strict frequency anticorrelations. This high degree of time frequency entanglement makes the created state ideal for driving two photon absorption.
Furthermore, the bandwidth of the produced biphotons can be tuned from 1 THz to 10 THz by adjusting the operating temperature of the source.
A broadband, bright source of quantum light also enables its use as an active element of so-called SU(1,1)-interferometers for applications in spectroscopy with undetected photons.