Experimental characterization of universal one-way quantum computing


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.

Publication DOI: https://doi.org/10.1088/1367-2630/15/5/053030
Divisions: College of Engineering & Physical Sciences
Additional Information: © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI
Publication ISSN: 1367-2630
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Related URLs: https://iopscie ... 5/5/053030/meta (Publisher URL)
PURE Output Type: Article
Published Date: 2013-05-01
Authors: Bell, B A
Tame, M S
Clark, A S
Nock, Richard (ORCID Profile 0000-0001-8384-9621)
Wadsworth, W J
Rarity, John G



Version: Published Version

License: Creative Commons Attribution

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