Optical parametric oscillator: Difference between revisions

Revision as of 03:04, 14 June 2015

Revision as of 03:09, 14 June 2015

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==Quantum properties of the generated light beams==

[[File:OPO Crystals.jpg|thumb|300 px|right|[[Potassium titanyl phosphate|KTP]] crystals in an OPO]]

The OPO is the physical system most widely used to generate [[squeezed coherent states]] and [[Quantum entanglement|entangled]] states of light in the continuous variables regime. Many demonstrations of quantum information protocols for continuous variables were realized using OPOs.<ref>{{cite journal|author=J. Jing, J. Zhang, Y. Yan, F. Zhao, C. Xie, and K. Peng|journal=Phys. Rev. Lett. |volume=90|page=167903|doi=10.1103/PhysRevLett.90.167903 |year=2003|title=Experimental Demonstration of Tripartite Entanglement and Controlled Dense Coding for Continuous Variables|issue=16|bibcode=2003PhRvL..90p7903J|arxiv = quant-ph/0210132 }}</ref><ref name="Koike">{{cite journal|author=S. Koike, H. Takahashi, H. Yonezawa, N. Takei, S. L. Braunstein, T. Aoki, and A. Furusawa|journal=Phys. Rev. Lett. |volume=96|page=060504 |year=2006|arxiv = quant-ph/0508007 |bibcode = 2006PhRvL..96a0504C |doi = 10.1103/PhysRevLett.96.010504 }}</ref><ref name="Koike" /><ref>{{cite journal|author=N. Takei, H. Yonezawa, T. Aoki, and A. Furusawa|journal=Phys. Rev. Lett. |volume=94|page=220502|doi=10.1103/PhysRevLett.94.220502 |year=2005|title=High-Fidelity Teleportation beyond the No-Cloning Limit and Entanglement Swapping for Continuous Variables|issue=22|bibcode=2005PhRvL..94v0502T|arxiv = quant-ph/0501086 }}</ref>

The [[Spontaneous parametric down conversion|downconversion]] process really occurs in the single photon regime: each pump photon that is annihilated inside the cavity gives rise to a pair of photons in the signal and idler intracavity modes. This leads to a quantum correlation between the intensities of signal and idler fields, so that there is squeezing in the subtraction of intensities,<ref>{{cite journal|author=A. Heidmann, R. J. Horowicz, S. Reynaud, E. Giacobino, C. Fabre, and G. Camy|journal=Phys. Rev. Lett. |volume=59|page=2555|doi=10.1103/PhysRevLett.59.2555 |year=1987|title=Observation of Quantum Noise Reduction on Twin Laser Beams|issue=22|bibcode=1987PhRvL..59.2555H}}</ref> which motivated the name "twin beams" for the downconverted fields. The highest squeezing level attained to date is 12.7&nbsp;dB.<ref>{{cite journal | last1 = Eberle | first1 = T. | last2 = Steinlechner | first2 = S. | last3 = Bauchrowitz | first3 = J. | last4 = Händchen | first4 = V. | last5 = Vahlbruch | first5 = H. | last6 = Mehmet | first6 = M. | last7 = Müller-Ebhardt | first7 = H. | last8 = Schnabel | first8 = R. | year = 2010 | title = Quantum Enhancement of the Zero-Area Sagnac Interferometer Topology for Gravitational Wave Detection | url = | journal = Phys. Rev. Lett | volume = 104 | issue = 25| page = 251102 | doi = 10.1103/PhysRevLett.104.251102 | bibcode=2010PhRvL.104y1102E|arxiv = 1007.0574 }}</ref>

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==References==

{{Reflist|30em}}

1. J.A.Giordmain, R.C.Miller, Tunable coherent parametric oscillation in LiNbO3 at optical frequencies, Phys. Rev. Letters 14, 973-976 (1965),

2. S.A.Akhmanov, A.I.Kovrigin, A.S.Piskarskas, V.V.Fadeev, R.V.Khokhlov, Observation of parametric amplification in the optical range, JETP Letters 2, No.7, 191-193 (1965)n q