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MSE461_09-02-2011_Zichao Ye _Paper_Surface Crystallization0

MSE461_09-02-2011_Zichao Ye _Paper_Surface Crystallization0...

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DOI: 10.1126/science.1128314 , 77 (2006); 313 Science , et al. Oleg G. Shpyrko Surface Crystallization in a Liquid AuSi Alloy This copy is for your personal, non-commercial use only. clicking here. colleagues, clients, or customers by , you can order high-quality copies for your If you wish to distribute this article to others here. following the guidelines can be obtained by Permission to republish or repurpose articles or portions of articles ): August 21, 2011 www.sciencemag.org (this infomation is current as of The following resources related to this article are available online at http://www.sciencemag.org/content/313/5783/77.full.html version of this article at: including high-resolution figures, can be found in the online Updated information and services, http://www.sciencemag.org/content/suppl/2006/07/03/313.5783.77.DC1.html can be found at: Supporting Online Material 42 article(s) on the ISI Web of Science cited by This article has been http://www.sciencemag.org/cgi/collection/mat_sci Materials Science subject collections: This article appears in the following registered trademark of AAAS. is a Science 2006 by the American Association for the Advancement of Science; all rights reserved. The title Copyright American Association for the Advancement of Science, 1200 New York Avenue NW, Washington, DC 20005. (print ISSN 0036-8075; online ISSN 1095-9203) is published weekly, except the last week in December, by the Science on August 21, 2011 www.sciencemag.org Downloaded from
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of the experiments in ( 26–29 ), wherein polar- ization entanglement is generated via post se- lection (see supporting online text and Fig. 4C). The mapping is performed assuming that quan- tum mechanics is correct ( 1 , 27–29 ). At t 0 0, the predicted CHSH Bell _ s parameter is S 0 2.68(2), a violation of the Bell _ s inequality k S k e 2. The predicted violation is not closer to the the- oretical maximum S max 0 2 ffiffi 2 p , 2 : 828 (dashed line of Fig. 4C), largely due to backgrounds set by the two-photon generation rate. The frequency bandwidths of the write and read photons are 1.1(2) MHz, making them ideal for interacting with narrowband systems such as atoms, molecules, and optical cavities. By separately heterodyning the write and read photons with laser light derived from the p - pump laser (measured linewidth of 50 kHz), we obtained the power spectral density of the pho- tons from the Fourier transform of the measured second-order autocorrelation function (Fig. 4D). The photons are nearly Fourier-transform limited, as can be seen from the 2-MHz full width at half-maximum power spectrum (Fig. 4E) of the measured cross-correlation function g wr ( t ) taken at slightly different parameters. These measurements show that pairs of nearly identical photons are generated at an ap- proximate rate of 5 ± 10 4 pairs/s into a single Gaussian transverse mode. The spectral bright- ness of 5 ± 10 4 pairs/s per MHz j 1 is È 10 3 times as bright as the best sources based on parametric downconversion with nonlinear crys- tals ( 8 ). The system can operate very near fun- damental limits on recovery efficiency, photon bandwidth, and two-photon suppression for a conditional single-photon source. In addition,
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