Letter abstract

Nature Photonics 3, 720 - 723 (2009)
Published online: 22 November 2009 | doi:10.1038/nphoton.2009.214

Subject Category: Quantum optics

Optimal quantum cloning of orbital angular momentum photon qubits through Hong–Ou–Mandel coalescence

Eleonora Nagali1, Linda Sansoni1, Fabio Sciarrino1,2, Francesco De Martini1,3, Lorenzo Marrucci4,5, Bruno Piccirillo4,6, Ebrahim Karimi4 & Enrico Santamato4,6

The orbital angular momentum (OAM) of light, associated with a helical structure of the wavefunction, has great potential in quantum photonics, as it allows a higher dimensional quantum space to be attached to each photon1, 2. Hitherto, however, the use of OAM has been hindered by difficulties in its manipulation. Here, by making use of the recently demonstrated spin-OAM information transfer tools3, 4, we report the first observation of the Hong–Ou–Mandel coalescence5 of two incoming photons having non-zero OAM into the same outgoing mode of a beamsplitter. The coalescence can be switched on and off by varying the input OAM state of the photons. Such an effect has then been used to carry out the 1 → 2 universal optimal quantum cloning of OAM-encoded qubits6, 7, 8, using the symmetrization technique already developed for polarization9, 10. These results are shown to be scalable to quantum spaces of arbitrary dimensions, even combining different degrees of freedom of the photons.

  1. Dipartimento di Fisica, Sapienza Università di Roma, Roma 00185, Italy
  2. Istituto Nazionale di Ottica Applicata, Firenze 50125, Italy
  3. Accademia Nazionale dei Lincei, via della Lungara 10, Roma 00165, Italy
  4. Dipartimento di Scienze Fisiche, Universitá di Napoli ‘Federico II’, Compl. Univ. di Monte S. Angelo, 80126 Napoli, Italy
  5. CNR-INFM Coherentia, Compl. Univ. di Monte S. Angelo, 80126 Napoli, Italy
  6. Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Napoli

Correspondence to: Fabio Sciarrino1,2 e-mail: fabio.sciarrino@uniroma1.it

Correspondence to: Lorenzo Marrucci4,5 e-mail: lorenzo.marrucci@na.infn.it


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