Implementation of a quantum controlled-SWAP gate with photonic circuits

Sci. Rep. 7, 45353 (2017) 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...

Full description

Saved in:
Bibliographic Details
Main Authors Ono, Takafumi, Okamoto, Ryo, Tanida, Masato, Hofmann, Holger F, Takeuchi, Shigeki
Format Journal Article
LanguageEnglish
Published 05.04.2017
Subjects
Physics - Quantum Physics
Online AccessGet full text

Cover

More Information
Summary:Sci. Rep. 7, 45353 (2017) 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.
DOI:10.48550/arxiv.1704.01348