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  Gaussian entanglement distribution with gigahertz bandwidth

Ast, S., Ast, M., Mehmet, M., & Schnabel, R. (2016). Gaussian entanglement distribution with gigahertz bandwidth. Optics Letters, 41(21), 5094-5097. doi:10.1364/OL.41.005094.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-3E44-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-3EE9-7
Genre: Journal Article

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1605.03429.pdf (Preprint), 300KB
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 Creators:
Ast, Stefan1, Author              
Ast, Melanie1, Author              
Mehmet, Moritz1, Author              
Schnabel, Roman1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010              

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Free keywords: Quantum Physics, quant-ph, Physics, Optics, physics.optics
 Abstract: The distribution of entanglement with Gaussian statistic can be used to generate a mathematically-proven secure key for quantum cryptography. The distributed secret key rate is limited by the {entanglement strength, the entanglement bandwidth and the bandwidth of the photo-electric detectors}. The development of a source for strongly, bi-partite entangled light with high bandwidth promises an increased measurement speed and a linear boost in the secure data rate. Here, we present the experimental realization of a Gaussian entanglement source with a bandwidth of more than 1.25\,GHz. The entanglement spectrum was measured with balanced homodyne detectors and was quantified via the inseparability criterion introduced by Duan and coworkers with a critical value of 4 below which entanglement is certified. Our measurements yielded an inseparability value of about 1.8 at a frequency of 300\,MHz to about 2.8 at 1.2\,GHz extending further to about 3.1 at 1.48\,GHz. In the experiment we used two 2.6\,mm long monolithic periodically poled potassium titanyl phosphate (PPKTP) resonators to generate two squeezed fields at the telecommunication wavelength of 1550\,nm. Our result proves the possibility of generating and detecting strong continuous-variable entanglement with high speed.

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 Dates: 2016-05-112016-11-062016
 Publication Status: Published in print
 Pages: 5 pages, 3 figures, published in Optics Letters
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 Identifiers: arXiv: 1605.03429
DOI: 10.1364/OL.41.005094
URI: http://arxiv.org/abs/1605.03429
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Title: Optics Letters
Source Genre: Journal
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Pages: - Volume / Issue: 41 (21) Sequence Number: - Start / End Page: 5094 - 5097 Identifier: -