A simple scheme for expanding photonic cluster states for quantum information

Abstract

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 2 photon, 3 qubit cluster state.

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Cited by in corpus (6)

• Experimental demonstration of a graph state quantum error-correction code
• Experimental measurement-based quantum computing beyond the cluster-state model
• Testing sequential quantum measurements: how can maximal knowledge be extracted?
• Experimental Realization of a Four-Photon Seven-Qubit Graph State for One-Way Quantum Computation
• Experimental demonstration of a measurement-based realisation of a quantum channel
• Multipartite entanglement encoded in the photon-number basis by sequential excitation of a three-level system