High-Fidelity Polarization Storage in a Gigahertz Bandwidth Quantum Memory
| Autor: | Patrick Michelberger, K. C. Lee, Ian A. Walmsley, Michael Sprague, Nathan K. Langford, Duncan G. England, Xian-Min Jin, Joshua Nunn, T. F. M. Champion, K. F. Reim, W. S. Kolthammer |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Atomic Physics (physics.atom-ph)
media_common.quotation_subject Fidelity FOS: Physical sciences 01 natural sciences Physics - Atomic Physics 010309 optics High fidelity 0103 physical sciences 010306 general physics media_common Physics Quantum network Process tomography Quantum Physics Research Groups and Centres\Physics\Low Temperature Physics business.industry Faculty of Science\Physics Bandwidth (signal processing) Pulse duration Condensed Matter Physics Polarization (waves) Atomic and Molecular Physics and Optics Interferometry Optoelectronics business Quantum Physics (quant-ph) |
| Zdroj: | Journal of Physics B: Atomic, Molecular and Optical Physics, 45 Journal of Physics B: Atomic, Molecular and Optical Physics |
| Popis: | We demonstrate a dual-rail optical Raman memory inside a polarization interferometer; this enables us to store polarization-encoded information at GHz bandwidths in a room-temperature atomic ensemble. By performing full process tomography on the system we measure up to 97\pm1% process fidelity for the storage and retrieval process. At longer storage times, the process fidelity remains high, despite a loss of efficiency. The fidelity is 86\pm4% for 1.5 \mu s storage time, which is 5,000 times the pulse duration. Hence high fidelity is combined with a large time-bandwidth product. This high performance, with an experimentally simple setup, demonstrates the suitability of the Raman memory for integration into large-scale quantum networks. Comment: 10 pages, 4 figures. Accepted for publication in Journal of Physics B |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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