Abstract
We present a silicon photonic integrated circuit (PIC) designed to generate high-dimensional (HD) entanglement across four discrete waveguide path modes. Our PIC is foundry fabricated and fully packaged with electrical wirebonds and an epoxy bonded fiber array. We performed a partial characterization of our system’s density matrix by demonstrating spectral indistinguishability of photon pairs, measuring the joint coincidence distribution of photon pairs across all pairs of output modes, and measuring the coherences of different mode pairs using two-photon interference. Using a quantitative entanglement witness, we have determined that our system generates at least 1.45 ± 0.15 ebits of HD photonic entanglement.
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