I discuss two triply resonant optical parametric oscillators I built: a nondegenerate design which demonstrated 6 dB gain and a degenerate one achieving 24 dB gain—demonstrating strong potential for record quantum squeezing as the squeezing record is 15 dB. These OPOs are sources of two-mode squeezed states, entangled photon pairs, and CV cluster states, supporting measurement-based quantum computing (MBQC) and related applications.
As for PNRDs, I significantly enhanced the photon number resolution of the superconducting transition edge sensor (TES) system in our lab, increasing it from 8 to 37 photons per channel, enabling the resolution of up to 100 photons setting a new record up from the previous record of 16. PNR detectors enable numerous applications, of which I cover a quantum random number generator which I experimentally demonstrated.
Together, the high-gain OPOs and refined TES bolster photonic CV quantum computing, by paving the way for cubic phase gate realization and by extension universal CV quantum computing.