Experimental characterization of universal one-way quantum computing

B.A. Bell, M.S. Tame, A.S. Clark, R.W. Nock, W.J. Wadsworth, J.G. Rarity

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Abstract

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.
Original languageEnglish
Article number053030
JournalNew Journal of Physics
Volume15
DOIs
Publication statusPublished - May 2013

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quantum computation
logic
photons
quantum computers
star clusters
resources
tomography
photonics
fibers
crystals
simulation

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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.

In: New Journal of Physics, Vol. 15, 053030, 05.2013.

Research output: Contribution to journalArticle

Bell, B.A. ; Tame, M.S. ; Clark, A.S. ; Nock, R.W. ; Wadsworth, W.J. ; Rarity, J.G. / Experimental characterization of universal one-way quantum computing. In: New Journal of Physics. 2013 ; Vol. 15.
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