Abstract
We demonstrate correlated photon pair generation via spontaneous four-wave mixing in a low-loss double-stripe silicon nitride waveguide with a coincidence-to-accidental ratio over 10. The coincidence-to-accidental ratio is limited by spontaneous Raman scattering, which can be mitigated by cooling in the future. This demonstration suggests that this waveguide structure is a potential platform to develop integrated quantum photonic chips for quantum information processing.
Highlights
Photonic quantum technology that harnesses the law of quantum mechanics has intrinsic advantages in several applications, such as quantum computation boosted by superposition [1] and quantum communication secured by entanglement [2]
Silicon has been used to demonstrate on-chip path entanglement [3], in which silicon rings are used for nonlinear photon generation and silicon-nanowire-based linear circuits are integrated for entanglement analysis
A propagation loss of 3 dB/cm in the silicon nanowire is unacceptable in particular circumstances which require long circuitry, for example, time-bin entanglement circuit contains a few centimeters longer arm in unbalanced Mach-Zehnder interferometers (UMZI) for time-bin generation and entanglement analysis [4]
Summary
Photonic quantum technology that harnesses the law of quantum mechanics has intrinsic advantages in several applications, such as quantum computation boosted by superposition [1] and quantum communication secured by entanglement [2]. The novel structure offers low propagation loss (0.2 dB/cm) and tight mode confinement Such waveguides can be fabricated using CMOS-compatible technologies at the length of tens of centimeters with high yield [4], which has not been reported in traditional silicon nitride nanowires. These unique features of the double-stripe silicon nitride waveguide has recently enabled the demonstration of compact linear optical circuits consisting of 50 cm long waveguides for on-chip time-bin entanglement [5], that experiment used a nonlinear photon source from a separate silicon chip. The generated signal and idler photons are referred to time-correlated photon pairs
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