BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Prof. Nicolas Treps\, Université Pierre et Marie Curie\n\n
\n Ultrafast frequency combs have found tremendous utility as prec ision instruments in domains ranging from frequency metrology\, optical&nb sp\;clocks\, \;broadband spectroscopy\, and absolute distance \;me asurement. This sensitivity originates from the \;fact that a comb car ries a huge number of \;co-propagating\, coherently-locked frequency m odes. Accordingly\, \;it is the aggregate noise arising from these ind ividual \;teeth that limits the achievable sensitivity for a given&nbs p\;measurement. Correlations among various frequencies are the key factor in describing and using an optical frequency comb. We have developed metho ds\, inspired from quantum optics\, to extract amplitude and phase correla tions among a multitude of spectral bands. From these\, we can deduce the spectral/temporal eigenmodes of a given optical frequency comb (OFC)\, and use it to either study the dynamics or the laser\, or to optimize metrolo gy experiments such as\, for instance\, ranging in turbulent medium[1\,2].
\n\n  \; \; \; \; \; \; \; \;&nbs p\; \; \; \; \; \; \; But beyond characterizing th e classical covariance matrix of an OFC\, one can\, using non-linear effec ts\, manipulate this noise and eventually reduce it even bellow quantum va cuum noise\, producing squeezed optical frequency combs. We have demonstra ted that by proper control of non-linear crystals\, optical cavities and p ulse shaping it was possible to embed within an optical frequency comb up to 10 spectral/temporal modes with non-classical noise properties[3]. Furt hermore\, dividing the spectrum of this comb into 10 frequency bands\, ent anglement is certified for all of the 115974 possible nontrivial partition s of this 10 mode state. This is the first demonstration of full multipart ite entanglement[4] and this source is shown to be a very promising candid ate for scalable measurement based quantum computing[5].
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\n\n References
\n\n [1] \; \; \; \; \; \; \; \; \; R. Sch meissner\, J. Roslund\, C. Fabre\, and N. Treps\, 113\, 2 63906 (2014).
\n\n [2] \; \;&nb sp\; \; \; \; \; \; \; P. Jian\, O. Pinel\, C. Fab re\, B. Lamine\, and N. Treps\, Opt Express 20\, 27133 (2 012).
\n\n [3] \; \; \;&nbs p\; \; \; \; \; \; J. Roslund\, R. M. De Araujo\, S. J iang\, and C. Fabre\, Nature Photonics 8\, 109 (2014).
\n\n [4] \; \; \; \;  \; \; \; \; \; S. Gerke\, J. Sperling\, W. Vogel\, Y. Cai\ , J. Roslund\, N. Treps\, and C. Fabre\, 114\, 050501 (20 15).
\n\n [5] \; \; \;  \; \; \; \; \; \; G. Ferrini\, J. P. Gazeau\, T. Coudr eau\, C. Fabre\, and N. Treps\, New J Phys 15\, 093015 (2 013).
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\n DTSTART:20160111T203000Z LOCATION:Physics Building\, Room 204 SUMMARY:Ultrafast Optical Frequency Comb: from laser dynamics to quantum n etworks END:VEVENT END:VCALENDAR