Implementation of a quantum controlled-SWAP gate with photonic circuits
arXiv:1704.01348
Abstract
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.
9 pages, 4 figures, Sci. Rep. 7, 45353 (2017)
References in corpus (15)
- Photonic quantum technologies
- Near optimal single photon sources in the solid state
- Optical Quantum Computing
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- On-Demand Single Photons with High Extraction Efficiency and Near-Unity Indistinguishability from a Resonantly Driven Quantum Dot in a Micropillar
- Beating the Standard Quantum Limit with Four Entangled Photons
- Controlled exchange interaction between pairs of neutral atoms in an optical lattice
- From three-photon GHZ states to ballistic universal quantum computation
- Toolbox for entanglement detection and fidelity estimation
- Sampling of partially distinguishable bosons and the relation to the multidimensional permanent
- Optimizing type-I polarization-entangled photons
- Generation of high-fidelity four-photon cluster state and quantum-domain demonstration of one-way quantum computing
- Fusing multiple W states simultaneously with a Fredkin gate
- Linear optical Fredkin gate based on partial-SWAP gate
- Experimental realization of linear-optical partial SWAP gates