Journal Article Implementation of a quantum controlled-SWAP gate with photonic circuits

Ono, Takafumi  ,  Okamoto, Ryo  ,  Tanida, Masato  ,  Hofmann, Holger F.  ,  Takeuchi, Shigeki

72017-03-31 , Springer Nature
光子を用いた、3量子ビットのゲート操作実現に成功 --光量子回路の飛躍的な高効率化に寄与--. 京都大学プレスリリース. 2017-04-03.
Quantum information science addresses how the processing and transmission of information are affected by uniquely quantum mechanical phenomena. Combination of two-qubit gates has been used to realize quantum circuits, however, scalability is becoming a critical problem. The use of three-qubit gates may simplify the structure of quantum circuits dramatically. Among them, the controlled-SWAP (Fredkin) gates are essential since they can be directly applied to important protocols, e.g., error correction, fingerprinting, and optimal cloning. Here we report a realization of the Fredkin gate for photonic qubits. We achieve a fidelity of 0.85 in the computational basis and an output state fidelity of 0.81 for a 3-photon Greenberger-Horne-Zeilinger state. The estimated process fidelity of 0.77 indicates that our Fredkin gate can be applied to various quantum tasks.

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