Physics – Quantum Physics
Scientific paper
2010-10-25
Nature Photonics 3, 720-723 (2009)
Physics
Quantum Physics
5 pages, 3 figures
Scientific paper
10.1038/nphoton.2009.214
The orbital angular momentum (OAM) of light, associated with a helical structure of the wavefunction, has a great potential for quantum photonics, as it allows attaching a higher dimensional quantum space to each photon. Hitherto, however, the use of OAM has been hindered by its difficult manipulation. Here, exploiting the recently demonstrated spin-OAM information transfer tools, we report the first observation of the Hong-Ou-Mandel coalescence of two incoming photons having nonzero OAM into the same outgoing mode of a beam-splitter. The coalescence can be switched on and off by varying the input OAM state of the photons. Such effect has been then exploited to carry out the 1 \rightarrow 2 universal optimal quantum cloning of OAM-encoded qubits, using the symmetrization technique already developed for polarization. These results are finally shown to be scalable to quantum spaces of arbitrary dimension, even combining different degrees of freedom of the photons.
Karimi Ebrahim
Marrucci Lorenzo
Martini Francesco de
Nagali Eleonora
Piccirillo Bruno
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