Optical parametric oscillator: Difference between revisions

Revision as of 12:54, 7 June 2022

Revision as of 02:08, 30 June 2022

Line 29:

Above threshold, the pump beam depletion makes it sensitive to the quantum phenomena happening inside the crystal. The first measurement of squeezing in the pump field after parametric interaction was done in 1997.<ref name="KasaiJiangrui1997">{{cite journal|last1=Kasai|first1=K|last2=Jiangrui|first2=Gao|last3=Fabre|first3=C|title=Observation of squeezing using cascaded nonlinearity|journal=Europhysics Letters (EPL)|volume=40|issue=1|year=1997|pages=25–30|issn=0295-5075|doi=10.1209/epl/i1997-00418-8|bibcode=1997EL.....40...25K|citeseerx=10.1.1.521.1373}}</ref>

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 = httphttps://www.sciencemagscience.org/contentdoi/326abs/595410.1126/823science.abstract1178683 | 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 |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>