Photonics has provided the basic platform to test many fundamental theories of contemporary physics and to build novel technologies utilizing them. In this talk, I will discuss examples of how concepts such as entanglement, entangled networks and Parity-Time-symmetry can be realized in simple optical setups, highlight some of the unanswered questions, and how collaboration among different disciplines (e.g., optics, materials science, physics and engineering, etc) can provide new insights towards scalable and feasible quantum photonic networks as well as high-performance optical devices and systems.
