Quantum Correlations between Single Telecom Photons and a Multimode On-Demand Solid-State Quantum Memory

 24 May 2017

Figure 1

Our group demonstrated quantum correlations between a telecom photon and a multimode on-demand solid state quantum memory. This is achieved by mapping a correlated single photon onto a spin collective excitation in a Pr:YSO crystal for a controllable time. The scientific results of this study have been published in Physical Review X and also highlighted in Physics.

Quantum correlations between long-lived quantum memories and telecom photons that can propagate with low loss in optical fibers are an essential resource for the realization of large-scale quantum information networks. Significant progress has been realized in this direction with atomic and solid-state systems. Here, we demonstrate quantum correlations between a telecom photon and a multimode on-demand solid state quantum memory. This is achieved by mapping a correlated single photon onto a spin collective excitation in a Pr:YSO crystal for a controllable time. The stored single photons are generated by cavity-enhanced spontaneous parametric down-conversion and heralded by their partner photons at telecom wavelength. These results represent the first demonstration of a multimode on-demand solid state quantum memory for external quantum states of light. They provide an important resource for quantum repeaters and pave the way for the implementation of quantum information networks with distant solid state quantum nodes.

The research team that participated in this study includes Alessandro Seri, Andreas Lenhard, Daniel Rieländer, Mustafa Gündoğan, Patrick M. Ledingham, Margherita Mazzera, and Prof. Hugues de Riedmatten.

Reference :

Quantum Correlations between Single Telecom Photons and a Multimode On-Demand Solid-State Quantum Memory
Alessandro Seri, Andreas Lenhard, Daniel Rieländer, Mustafa Gündoğan, Patrick M. Ledingham, Margherita Mazzera, and Prof. Hugues de Riedmatten
Phys. Rev. X 7, 021028 (2017)