Raman Quantum Memory with Built-In Suppression of Four-wave Mixing Noise
| Autor: | Thomas, Sarah E., Hird, Thomas M., Munns, Joseph H. D., Brecht, Benjamin, Saunders, Dylan J., Nunn, Joshua, Walmsley, Ian A., Ledingham, Patrick M. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 100, 033801 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.100.033801 |
| Popis: | Quantum memories are essential for large-scale quantum information networks. Along with high efficiency, storage lifetime and optical bandwidth, it is critical that the memory add negligible noise to the recalled signal. A common source of noise in optical quantum memories is spontaneous four-wave mixing. We develop and implement a technically simple scheme to suppress this noise mechanism by means of quantum interference. Using this scheme with a Raman memory in warm atomic vapour we demonstrate over an order of magnitude improvement in noise performance. Furthermore we demonstrate a method to quantify the remaining noise contributions and present a route to enable further noise suppression. Our scheme opens the way to quantum demonstrations using a broadband memory, significantly advancing the search for scalable quantum photonic networks. Comment: 6 pages, 5 figures plus Supplementary Material |
| Databáze: | arXiv |
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