The 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 x 10(4)) and narrow homogeneous linewidths (6 +/- 2 MHz) that do not exhibit significant transit-time broadening, showing that we can prepare a Lambda-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.

Sprague MR, England DG, Abdolvand A, Nunn J, Jin XM, Kolthammer WS, et al. (2013). Efficient optical pumping and high optical depth in a hollow-core photonic-crystal fibre for a broadband quantum memory. NEW JOURNAL OF PHYSICS, 15 [10.1088/1367-2630/15/5/055013].

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

BARBIERI, MARCO;
2013

Abstract

The 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 x 10(4)) and narrow homogeneous linewidths (6 +/- 2 MHz) that do not exhibit significant transit-time broadening, showing that we can prepare a Lambda-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.
Sprague MR, England DG, Abdolvand A, Nunn J, Jin XM, Kolthammer WS, et al. (2013). Efficient optical pumping and high optical depth in a hollow-core photonic-crystal fibre for a broadband quantum memory. NEW JOURNAL OF PHYSICS, 15 [10.1088/1367-2630/15/5/055013].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/117313
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