### Abstract

Original language | English |
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Article number | 053030 |

Journal | New Journal of Physics |

Volume | 15 |

DOIs | |

Publication status | Published - May 2013 |

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### Cite this

*New Journal of Physics*,

*15*, [053030]. https://doi.org/10.1088/1367-2630/15/5/053030

**Experimental characterization of universal one-way quantum computing.** / Bell, B.A.; Tame, M.S.; Clark, A.S.; Nock, R.W.; Wadsworth, W.J.; Rarity, J.G.

Research output: Contribution to journal › Article

*New Journal of Physics*, vol. 15, 053030. https://doi.org/10.1088/1367-2630/15/5/053030

}

TY - JOUR

T1 - Experimental characterization of universal one-way quantum computing

AU - Bell, B.A.

AU - Tame, M.S.

AU - Clark, A.S.

AU - Nock, R.W.

AU - Wadsworth, W.J.

AU - Rarity, J.G.

PY - 2013/5

Y1 - 2013/5

N2 - We report the characterization of a universal set of logic gates for one-way quantum computing using a four-photon 'star' cluster state generated by fusing photons from two independent photonic crystal fibre sources. We obtain a fidelity for the cluster state of 0.66 ± 0.01 with respect to the ideal case. We perform quantum process tomography to completely characterize a controlled-NOT, Hadamard and T gate all on the same compact entangled resource. Together, these operations make up a universal set of gates such that arbitrary quantum logic can be efficiently constructed from combinations of them. We find process fidelities with respect to the ideal cases of 0.64 ± 0.01 for the CNOT, 0.67 ± 0.03 for the Hadamard and 0.76 ± 0.04 for the T gate. The characterization of these gates enables the simulation of larger protocols and algorithms. As a basic example, we simulate a Swap gate consisting of three concatenated CNOT gates. Our work provides some pragmatic insights into the prospects for building up to a fully scalable and fault-tolerant one-way quantum computer with photons in realistic conditions.

AB - We report the characterization of a universal set of logic gates for one-way quantum computing using a four-photon 'star' cluster state generated by fusing photons from two independent photonic crystal fibre sources. We obtain a fidelity for the cluster state of 0.66 ± 0.01 with respect to the ideal case. We perform quantum process tomography to completely characterize a controlled-NOT, Hadamard and T gate all on the same compact entangled resource. Together, these operations make up a universal set of gates such that arbitrary quantum logic can be efficiently constructed from combinations of them. We find process fidelities with respect to the ideal cases of 0.64 ± 0.01 for the CNOT, 0.67 ± 0.03 for the Hadamard and 0.76 ± 0.04 for the T gate. The characterization of these gates enables the simulation of larger protocols and algorithms. As a basic example, we simulate a Swap gate consisting of three concatenated CNOT gates. Our work provides some pragmatic insights into the prospects for building up to a fully scalable and fault-tolerant one-way quantum computer with photons in realistic conditions.

UR - http://www.scopus.com/inward/record.url?scp=84878221133&partnerID=8YFLogxK

UR - http://dx.doi.org/10.1088/1367-2630/15/5/053030

U2 - 10.1088/1367-2630/15/5/053030

DO - 10.1088/1367-2630/15/5/053030

M3 - Article

VL - 15

JO - New Journal of Physics

JF - New Journal of Physics

SN - 1367-2630

M1 - 053030

ER -