Abstract
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 Pr3+:Y2SiO5 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.Received 9 December 2016DOI:https://doi.org/10.1103/PhysRevX.7.021028Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum communicationQuantum information architectures & platformsQuantum memoriesQuantum Information
Highlights
Photonic quantum memories [1] are essential elements for quantum information networks [2], providing efficient and on-demand interfacing between single photons and stationary qubits, e.g., atomic gases [3,4,5,6], electronic spins in diamonds [7,8], or phonons [9,10]
The storage time is currently limited by the spin inhomogeneous broadening and could be increased using spin-echo and dynamical decoupling techniques [32], with prospects for achieving values up to one minute [13] in our crystal, while even longer storage times may be available in Eu3þ∶Y2SiO5 [14]
We have reported the first demonstration of quantum storage of heralded single photons in an on-demand solid state quantum memory
Summary
Photonic quantum memories [1] are essential elements for quantum information networks [2], providing efficient and on-demand interfacing between single photons and stationary qubits, e.g., atomic gases [3,4,5,6], electronic spins in diamonds [7,8], or phonons [9,10]. Possible solutions to overcome this problem include quantum frequency conversion [3,21,22,23,24,25] or nondegenerate photon pair sources to establish entanglement between quantum memories and telecom photons [15,26,27,28,29] The latter approach has been demonstrated using the atomic frequency comb scheme [30] in rare-earth-doped single crystals or waveguides [15,27,28], but the storage of photonic entanglement has only been performed so far in the excited state for short and predetermined storage times. We demonstrate that our memory can store spin waves in multiple independent temporal modes
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