Observation of Three-Photon Spontaneous Parametric Down-Conversion in a Superconducting Parametric Cavity
C. W. Sandbo Chang, Carlos Sabín, P. Forn-Díaz, Fernando Quijandría, A. M. Vadiraj, Ibrahim Nsanzineza, Göran Johansson, Christopher M. Wilson · Physical Review X · 2020
A long-sought three-photon version of spontaneous parametric down-conversion, a common technique for entangled photon generation, lays the groundwork for expanded investigations into novel types of quantum entanglements and quantum computing resources.