High-Resolution Measurement of Energy Correlations of Photon Pairs Generated in Silicon Ring Resonators

Liscidini, M;Grassani, D;Simbula, A;Galli, M;Pirotta, S;Baehr-Jones, T;Hochberg, M;Harris, NC;Galland, C;Sipe, JE;Bajoni, D

2015-01-01

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Abstract

Silicon micro-ring resonators have been demonstrated to be potential "on-chip" efficient sources of time-energy entangled photons. In these devices, photon pairs are generated by spontaneous four-wave-mixing (SFWM), an elastic scattering event involving two pump photons that results in the generation of an idler and a signal photon. The mass production of such integrated devices for quantum optic experiment requires the implementation of fast and reliable techniques to monitor the emitted two-photon state as well as the device performances. In this work we show that the joint spectral density of photon pairs that would be generated by SFWM in a silicon ring resonator can be measured with unprecedented resolution and speed, improving of several orders of magnitudes the results of traditional approaches based on coincidence measurements.