Photon pair sources with controlled frequency correlation

Photon correlation in single-photon frequency upconversion.

We experimentally investigated the intensity cross-correlation between the upconverted photons and the unconverted photons in the single-photon frequency upconversion process with multi-longitudinal mode pump and signal sources. In theoretical analysis, with this multi-longitudinal mode of both signal and pump sources system, the properties of the signal photons could also be maintained as in t...

Quantum repeaters with photon pair sources and multimode memories.

We propose a quantum repeater protocol which builds on the well-known Duan-Lukin-Cirac-Zoller (DLCZ) protocol [L. M. Duan, M. D. Lukin, J. I. Cirac, and P. Zoller, Nature (London) 414, 413 (2001)10.1038/35106500], but which uses photon pair sources in combination with memories that allow to store a large number of temporal modes. We suggest to realize such multimode memories based on the princi...

Temporal correlations of spectrally narrowband photon pair sources

We report on theoretical and experimental investigations of time-resolved crossand auto-correlation measurements of spectrally narrowband photon pairs generated in sources based on parametric down conversion in resonant waveguide structures.We show that time-resolvedmeasurements provide detailed and useful information about the spectral andmodal structure of the bi-photon state. The shape of th...

Design of bright, fiber-coupled and fully factorable photon pair sources

From quantum computation to quantum key distribution, many quantumenhanced applications rely on the ability to generate pure single-photons. Even though the process of spontaneous parametric downconversion is widely used as the basis for photon-pair sources, the conditions for pure heralded single-photon generation, taking into account both spectral and spatial degrees of freedom, have not been...

Single Photon Sources