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Not only intensity and phase of the twin beams share quantum correlations, but also do their spatial modes.<ref>{{cite journal|author1=M. Martinelli |author2=N. Treps |author3=S. Ducci |author4=S. Gigan |author5=A. Maître |author6=C. Fabre |last-author-amp=yes |journal=Phys. Rev. A |volume=67|page=023808|doi=10.1103/PhysRevA.67.023808 |year=2003|title=Experimental study of the spatial distribution of quantum correlations in a confocal optical parametric oscillator|issue=2|arxiv = quant-ph/0210023 |bibcode = 2003PhRvA..67b3808M }}</ref> This feature could be used to enhance signal to noise ratio in image systems and hence surpass the standard quantum limit (or the shot noise limit) for imaging.<ref>{{cite journal | last1 = Treps | first1 = N. | last2 = Andersen | first2 = U. | last3 = Buchler | first3 = B. | last4 = Lam | first4 = P. K. | last5 = Maitre | first5 = A. | last6 = Bachor | first6 = H.-A. | last7 = Fabre | first7 = C. | year = 2002 | title = Surpassing the Standard Quantum Limit for Optical Imaging Using Nonclassical Multimode Light | url = | journal = Phys. Rev. Lett | volume = 88 | issue = 20| page = 203601 | doi = 10.1103/PhysRevLett.88.203601 | bibcode=2002PhRvL..88t3601T|arxiv = quant-ph/0204017 }}</ref>
==Applications==
The OPO is being employed nowadays as a source of squeezed light tuned to atomic transitions, in order to study how the atoms interact with squeezed light.<ref>{{cite journal|author1=T. Tanimura |author2=D. Akamatsu |author3=Y. Yokoi |author4=A. Furusawa |author5=M. Kozuma |journal=Opt. Lett. |volume=31|pages=2344–6|doi=10.1364/OL.31.002344 |year=2006|title=Generation of a squeezed vacuum resonant on a rubidium D1 line with periodically poled KTiOPO4|issue=15|pmid=16832480|arxiv = quant-ph/0603214 |bibcode = 2006OptL...31.2344T }}</ref>
It is also recently demonstrated that a degenerate OPO can be used as an all-optical quantum [[Hardware random number generator|random number generator]] that does not require post processing.<ref>{{cite journal|last=Marandi|first=A.|author2=N. C. Leindecker |author3=K. L. Vodopyanov |author4=R. L. Byer |journal=Opt. Express|volume=20|pages= 19322–19330|year=2012|title=All-optical quantum random bit generation from intrinsically binary phase of parametric oscillators|doi=10.1364/OE.20.019322|url=http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-20-17-19322|arxiv = 1206.0815 |bibcode = 2012OExpr..2019322M }}</ref>
==See also==▼
* [[Nonlinear optics]]▼
* [[Optical parametric amplifier]]▼
==References==
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'''Articles on OPOs'''
* [http://www.rp-photonics.com/optical_parametric_oscillators.html] ''Encyclopedia of Laser Physics and Technology''
▲==See also==
▲* [[Nonlinear optics]]
▲* [[Optical parametric amplifier]]
{{DEFAULTSORT:Optical Parametric Oscillator}}
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