SAMOP 2023 – scientific programme

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QI: Fachverband Quanteninformation

QI 24: Integrated Photonics II (joint session Q/QI)

QI 24.1: Talk

Wednesday, March 8, 2023, 17:00–17:15, A320

Integrated bright broadband PDC source for quantum metrology — •René Pollmann, Franz Roeder, Victor Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Str. 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. For entangled two photon absorption especially very high brightness combined with high spectro temporal entanglement is crucial to observe a signal. So far these conditions could be met by using high power lasers driving bulk degenerate type 0 spontaneous parametric down conversion (SPDC) sources. This naturally limits the available wavelength ranges and precludes deterministic control over the output state. In this work we show an integrated two colour SPDC source utilising a group-velocity matched lithium niobate waveguide, reaching both high brightness (>6.7 · 10¹¹ pairs/Ws) and large bandwidth (>6 THz) while using less than 5 mW of continuous wave pump power. Since the product of the measured correlation time of the photons Δ τ ≈ 80 fs and the pump bandwidth of Δ ω_p ≪ 1 MHz violates the classical Fourier limit, the source shows very strong time frequency entanglement. Furthermore our process can be adapted to a wide range of central wavelengths.