Photonic quantum state transfer between a cold atomic gas and a crystal
| Autor: | Margherita Mazzera, Pau Farrera, Georg Heinze, Hugues de Riedmatten, Kutlu Kutluer, Nicolas Maring |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Interconnection
Quantum network Quantum Physics Multidisciplinary Photon business.industry Chemistry FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Quantum state Interfacing Qubit 0103 physical sciences Optoelectronics Atomic physics Photonics 010306 general physics 0210 nano-technology business Quantum Physics (quant-ph) Quantum |
| Popis: | In a step towards hybrid quantum networks, a quantum state can be transferred between two fundamentally different systems—a cold atomic ensemble and a solid-state crystal—by a single photon. As work on quantum networks continues apace, attention is being focused on the tools and techniques for integrating different quantum platforms to harness the distinct benefits of each. Nicolas Maring et al. now report an important step in the development of such a hybrid network. They demonstrate how a quantum state initially stored in a cold atomic ensemble can be faithfully transferred to a solid-state storage medium—a rare-earth-doped crystal—from where it can subsequently be recovered. Interfacing fundamentally different quantum systems is key to building future hybrid quantum networks1. Such heterogeneous networks offer capabilities superior to those of their homogeneous counterparts, as they merge the individual advantages of disparate quantum nodes in a single network architecture2. However, few investigations of optical hybrid interconnections have been carried out, owing to fundamental and technological challenges such as wavelength and bandwidth matching of the interfacing photons. Here we report optical quantum interconnection of two disparate matter quantum systems with photon storage capabilities. We show that a quantum state can be transferred faithfully between a cold atomic ensemble3,4 and a rare-earth-doped crystal5,6,7,8 by means of a single photon at 1,552 nanometre telecommunication wavelength, using cascaded quantum frequency conversion. We demonstrate that quantum correlations between a photon and a single collective spin excitation in the cold atomic ensemble can be transferred to the solid-state system. We also show that single-photon time-bin qubits generated in the cold atomic ensemble can be converted, stored and retrieved from the crystal with a conditional qubit fidelity of more than 85 per cent. Our results open up the prospect of optically connecting quantum nodes with different capabilities and represent an important step towards the realization of large-scale hybrid quantum networks. |
| Databáze: | OpenAIRE |
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