Integrated, bright, broadband parametric down-conversion source for
quantum metrology and spectroscopy
- URL: http://arxiv.org/abs/2402.17515v1
- Date: Tue, 27 Feb 2024 13:57:16 GMT
- Title: Integrated, bright, broadband parametric down-conversion source for
quantum metrology and spectroscopy
- Authors: Ren\'e Pollmann, Franz Roeder, Victor Quiring, Raimund Ricken,
Christof Eigner, Benjamin Brecht, and Christine Silberhorn
- Abstract summary: In this work we demonstrate an integrated two-colour SPDC source utilising a group-velocity matched lithium niobate waveguide.
By converting a narrow band pump to broadband pulses the created photon pairs show correlation times of $Delta tau approx 120,textfs$ while maintaining the narrow bandwidth $Delta omega_p ll 1,textMHz$ of the CW pump light, yielding strong time-frequency entanglement.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Broadband quantum light is a vital resource for quantum metrology and
spectroscopy applications such as quantum optical coherence tomography or
entangled two photon absorption. For entangled two photon absorption in
particular, very high photon flux combined with high time-frequency
entanglement is crucial for observing a signal. So far these conditions could
be met by using high power lasers driving degenerate, type 0 bulk-crystal
spontaneous parametric down conversion (SPDC) sources. This naturally limits
the available wavelength ranges and precludes deterministic splitting of the
generated output photons. In this work we demonstrate an integrated two-colour
SPDC source utilising a group-velocity matched lithium niobate waveguide,
reaching both exceptional brightness
$1.52\cdot10^6\frac{\mathrm{pairs}}{\mathrm{s\,mW\,GHz}}$ and large bandwidth
($7.8\,$THz FWHM) while pumped with a few mW of continuous wave (CW) laser
light. By converting a narrow band pump to broadband pulses the created photon
pairs show correlation times of $\Delta \tau \approx 120\,\text{fs}$ while
maintaining the narrow bandwidth $\Delta \omega_p \ll 1\,\text{MHz}$ of the CW
pump light, yielding strong time-frequency entanglement. Furthermore our
process can be adapted to a wide range of central wavelengths.
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