Phys. Rev. A 77, 012324 (2008) [5 pages]Experimental sub-Rayleigh resolution by an unseeded high-gain optical parametric amplifier for quantum lithographyReceived 18 July 2007; published 22 January 2008 Quantum lithography proposes to adopt entangled quantum states in order to increase resolution in interferometry. In the present paper we experimentally demonstrate that the output of a high-gain optical parametric amplifier can be intense yet exhibits quantum features, namely, sub-Rayleigh fringes, as proposed by [ Agarwal et al. Phys. Rev. Lett. 86 1389 (2001)]. We investigate multiphoton states generated by a high-gain optical parametric amplifier operating with a quantum vacuum input for gain values up to 2.5. The visibility has then been increased by means of three-photon absorption. The present paper opens interesting perspectives for the implementation of such an advanced interferometrical setup. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.012324
DOI:
10.1103/PhysRevA.77.012324
PACS:
03.67.Hk, 42.65.Lm
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