On-chip silicon photonic coupled-cavity arrays (CCAs) are a promising platform for quantum simulators, with access to high quality ($Q$) factor resonators, tunability, and foundry compatibility. Furthermore, scalable two-dimensional (2D) silicon photonic CCAs allow for simulation of rich physical phenomena via Hamiltonian engineering. However, complete reconstruction of the Hamiltonian is limited by access to cavities in the bulk, with current approaches relying on imaging scattered light from bulk resonators. These approaches often require additional scatterers to be built in, limiting scalability, while also being hampered by imaging technology in the near-infrared range. Instead of these approaches, Hamiltonian tomography algorithms that require homodyne boundary measurements have been demonstrated in the literature; however, measurements of complex scattering along a CCA boundary have not been shown. Here, we experimentally demonstrate an on-chip homodyne measurement setup along a single boundary of a silicon photonic racetrack resonator array and reconstruct the system’s edge scattering matrix.

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• Integrated optics
• Nanophotonics
• Phononics
• Scattering theory
• Interfaces
• Optical microcavities
• Tomography