Simple scheme for expanding photonic cluster states for quantum information

P. Kalasuwan, G. Mendoza, A. Laing, T. Nagata, J. Coggins, M. Callaway, S. Takeuchi, A. Stefanov, J. L. O'Brien

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We show how an entangled cluster state encoded in the polarization of single photons can be straightforwardly expanded by deterministically entangling additional qubits encoded in the path degree of freedom of the constituent photons. This can be achieved using a polarization-path controlled-phase gate. We experimentally demonstrate a practical and stable realization of this approach by using a Sagnac interferometer to entangle a path qubit and polarization qubit on a single photon. We demonstrate precise control over phase of the path qubit to change the measurement basis and experimentally demonstrate properties of measurement-based quantum computing using a two-photon, three-qubit cluster state.

Original languageEnglish
JournalJournal of the Optical Society of America B: Optical Physics
Issue number6
Publication statusPublished - 1 Jun 2010
Externally publishedYes


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