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Simple Atomic Quantum Memory Suitable for Semiconductor Quantum Dot Single Photons

Wolters, Janik and Buser, Gianni and Horsley, Andrew and Beguin, Lucas and Jockel, Andreas and Jahn, Jan-Philipp and Warburton, Richard J. and Treutlein, Philipp. (2017) Simple Atomic Quantum Memory Suitable for Semiconductor Quantum Dot Single Photons. Physical Review Letters, 119 (6). 060502.

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Official URL: http://edoc.unibas.ch/58164/

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Abstract

Quantum memories matched to single photon sources will form an important cornerstone of future quantum network technology. We demonstrate such a memory in warm Rb vapor with on-demand storage and retrieval, based on electromagnetically induced transparency. With an acceptance bandwidth of delta f = 0.66 GHz, the memory is suitable for single photons emitted by semiconductor quantum dots. In this regime, vapor cell memories offer an excellent compromise between storage efficiency, storage time, noise level, and experimental complexity, and atomic collisions have negligible influence on the optical coherences. Operation of thememory is demonstrated using attenuated laser pulses on the single photon level. For a 50 ns storage time, we measure eta(50)(e2e) (ns) = 3.4(3)% end-to-end efficiency of the fiber-coupled memory, with a total intrinsic efficiency eta(int) = 17(3)%. Straightforward technological improvements can boost the end-to-end-efficiency to eta(e2e) approximate to 35%; beyond that, increasing the optical depth and exploiting the Zeeman substructure of the atoms will allow such a memory to approach near unity efficiency. In the present memory, the unconditional read-out noise level of 9 x 10(-3) photons is dominated by atomic fluorescence, and for input pulses containing on average mu(1) = 0.27(4) photons, the signal to noise level would be unity.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimental Physics (Warburton)
05 Faculty of Science > Departement Physik > Physik > Experimentelle Nanophysik (Treutlein)
UniBasel Contributors:Treutlein, Philipp and Wolters, Janik and Buser, Gianni and Horsley, Andrew and Beguin, Lucas and Jöckel, Andreas and Jahn, Jan-Philipp and Warburton, Richard J
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0031-9007
e-ISSN:1079-7114
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:28 Dec 2017 10:10
Deposited On:28 Dec 2017 10:10

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