Coherence properties of a single dipole emitter in diamond

Details Coherence properties of a single dipole emitter in diamond Coherence properties of a single dipole emitter in diamond

2010-09-12

arxiv.org/abs/1009.2272v1

New Journal of Physics, vol. 13, art. 055016, 2011

Physics

Quantum Physics

10 pages, 4 colour figures

Scientific paper

10.1088/1367-2630/13/5/055016

On-demand, high repetition rate sources of indistinguishable, polarised single photons are the key component for future photonic quantum technologies. Colour centres in diamond offer a promising solution, and the narrow line-width of the recently identified nickel-based NE8 centre makes it particularly appealing for realising the transform-limited sources necessary for quantum interference. Here we report the characterisation of dipole orientation and coherence properties of a single NE8 colour centre in a diamond nanocrystal at room-temperature. We observe a single photon coherence time of 0.21 ps and an emission lifetime of 1.5 ns. Combined with an emission wavelength that is ideally suited for applications in existing quantum optical systems, these results show that the NE8 is a far more promising source than the more commonly studied nitrogen-vacancy centre and point the way to the realisation of a practical diamond colour centre-based single photon source.

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