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It has been recently predicted that all three fields (pump, signal and idler) must be entangled,<ref>{{cite journal|author1=A. S. Villar |author2=M. Martinelli |author3=C Fabre |author4=P. Nussenzveig |name-list-style=amp |journal=Phys. Rev. Lett. |volume=97|page=140504|doi=10.1103/PhysRevLett.97.140504 |year=2006|title=Direct Production of Tripartite Pump-Signal-Idler Entanglement in the Above-Threshold Optical Parametric Oscillator|issue=14|bibcode=2006PhRvL..97n0504V|arxiv = quant-ph/0610062 |pmid=17155232|s2cid=37328629 }}</ref> a prediction which was experimentally demonstrated by the same group.<ref>{{cite journal | last1 = Coelho | first1 = A. S. | last2 = Barbosa | first2 = F. A. S. | last3 = Cassemiro | first3 = K. N. | last4 = Villar | first4 = A. S. | last5 = Martinelli | first5 = M. | last6 = Nussenzveig | first6 = P. | year = 2009 | title = Three-Color Entanglement | url = https://www.science.org/doi/abs/10.1126/science.1178683 | journal = Science | volume = 326 | issue = 5954| pages = 823–826 | doi=10.1126/science.1178683| pmid = 19762598 |arxiv = 1009.4250 |bibcode = 2009Sci...326..823C | s2cid = 29660274 }}</ref>
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|author3-link= Sara Ducci |author4=S. Gigan |author5=A. Maître |author6=C. Fabre |name-list-style=amp |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 |s2cid=119471952 }}</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 | journal = Phys. Rev. Lett. | volume = 88 | issue = 20| page = 203601 | doi = 10.1103/PhysRevLett.88.203601 | pmid = 12005563 | bibcode=2002PhRvL..88t3601T|arxiv = quant-ph/0204017 | s2cid = 20948903 }}</ref>
==Applications==
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