Efficient optical pumping and high optical depth in a hollow-core photonic-crystal fibre for a broadband quantum memory

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DOIResolve DOI: http://doi.org/10.1088/1367-2630/15/5/055013
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TypeArticle
Journal titleNew Journal of Physics
ISSN1367-2630
Volume15
Article number55013
SubjectBroadband pulse; High-efficiency; Hollow-core photonic-crystal; Light-matter coupling; Multiphoton quantum; Nonlinear optical effects; Quantum memory; Room temperature; Computer simulation; Optical fibers; Optical waveguides; Quantum theory; Optical pumping
AbstractThe generation of large multiphoton quantum states - for applications in computing, metrology and simulation - requires a network of high-efficiency quantum memories capable of storing broadband pulses. Integrating these memories into a fibre offers a number of advantages towards realizing this goal: strong light-matter coupling at low powers, simplified alignment and compatibility with existing photonic architectures. Here, we introduce a large-core kagome-structured hollow-core fibre as a suitable platform for an integrated fibre-based quantum memory with a warm atomic vapour. We demonstrate, for the first time, efficient optical pumping in such a system, where 90 ± 1% of atoms are prepared in the ground state. We measure high optical depths (3 × 104) and narrow homogeneous linewidths (6 ± 2 MHz) that do not exhibit significant transit-time broadening, showing that we can prepare a Λ-level system in a pure state. Our results establish that kagome fibres are suitable for implementing a broadband, room-temperature quantum memory, as well as a range of nonlinear optical effects. © IOP Publishing and Deutsche Physikalische Gesellschaft.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270538
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Record identifierbfdd8b17-dd65-48fd-ad75-23526319dc42
Record created2014-02-17
Record modified2016-05-09
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