Phys. Rev. A 76, 042126 (2007) [6 pages]Experimental realization of macroscopic coherence by phase-covariant cloning of a single photonReceived 13 December 2006; revised 12 September 2007; published 29 October 2007 We investigate the multiphoton states generated by high-gain optical parametric amplification of a single injected photon, polarization encoded as a “qubit.” The experiment configuration exploits the optimal phase-covariant cloning in the high gain regime. The interference fringe pattern showing the nonlocal transfer of coherence between the injected qubit and the mesoscopic amplified output field involving up to 4000 photons has been investigated. A probabilistic method to extract full information about the multiparticle output wave function has been implemented. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.76.042126
DOI:
10.1103/PhysRevA.76.042126
PACS:
03.65.Ta, 03.67.Hk, 42.50.Xa, 42.65.Lm
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