Experimental characterization of universal one-way quantum computing

B A Bell, M S Tame, A S Clark, Richard Nock, W J Wadsworth, John G Rarity

Research output: Contribution to journalArticlepeer-review

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 - 1 May 2013

Bibliographical note

© 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

Fingerprint Dive into the research topics of 'Experimental characterization of universal one-way quantum computing'. Together they form a unique fingerprint.

Cite this