Integrated, bright, broadband parametric down-conversion source for quantum metrology and spectroscopy
Optics Express(2024)
摘要
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
1.52·10^6pairs/s mW GHz and large bandwidth
(7.8THz 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 Δτ≈ 120 fs while
maintaining the narrow bandwidth Δω_p ≪ 1 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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