Decoherence-protected memory for a single-photon qubit
| Autor: | Olivier Morin, Gerhard Rempe, Andreas Neuzner, Stephan Ritter, Matthias Körber, Stefan Langenfeld |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Quantum network Coherence time Quantum Physics Photon Quantum decoherence business.industry FOS: Physical sciences Data_CODINGANDINFORMATIONTHEORY 01 natural sciences Teleportation Atomic and Molecular Physics and Optics 010305 fluids & plasmas Electronic Optical and Magnetic Materials Computer Science::Emerging Technologies Qubit Quantum mechanics 0103 physical sciences Photonics Quantum Physics (quant-ph) 010306 general physics business Quantum computer |
| Zdroj: | Nature Photonics |
| Popis: | The long-lived, efficient storage and retrieval of a qubit encoded on a photon is an important ingredient for future quantum networks. Although systems with intrinsically long coherence times have been demonstrated, the combination with an efficient light-matter interface remains an outstanding challenge. In fact, the coherence times of memories for photonic qubits are currently limited to a few milliseconds. Here we report on a qubit memory based on a single atom coupled to a high-finesse optical resonator. By mapping and remapping the qubit between a basis used for light-matter interfacing and a basis which is less susceptible to decoherence, a coherence time exceeding 100 ms has been measured with a time-independant storage-and-retrieval efficiency of 22%. This demonstrates the first photonic qubit memory with a coherence time that exceeds the lower bound needed for teleporting qubits in a global quantum internet. 3 pages, 4 figures |
| Databáze: | OpenAIRE |
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