### A quantum Fredkin gate

#### Joseph Ho, Griffith University, Australia

11:oo am, Salle de séminaire de Pinchat.

While the salient features of a quantum computer have been shown in proof-of-principle experiments, e.g., single- and two-qubit gates forming a universal gate set, difficulties in scaling up the quantum systems to control multiple qubits have made demonstrations of mode complex operations intractable. This is exemplified by the classical Fredkin (or controlled-SWAP) gate for which, despite many theoretical proposals, a true quantum analogue has yet to be realised. Here, by directly adding control to the two qubit SWAP unitary, we use photonic qubit logic to report on one of the first experimental demonstration of a quantum Fredkin gate.

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