Experimental characterization of universal one-way quantum computing

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 characterisation 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.

15 pages, 7 figures

References in corpus (17)

• Resource-efficient linear optical quantum computation
• Experimental entanglement of six photons in graph states
• Progressive field-state collapse and quantum non-demolition photon counting
• A wavelength-tunable fiber-coupled source of narrowband entangled photons
• High-speed linear optics quantum computing using active feed-forward
• Experimental Analysis of a 4-Qubit Cluster State
• Novel schemes for measurement-based quantum computation
• Universal resources for measurement-based quantum computation
• Measurement-based quantum computation beyond the one-way model
• Experimental demonstration of topological error correction
• Photonic crystal fibre source of photon pairs for quantum information processing
• Realization and characterization of a 2-photon 4-qubit linear cluster state
• Experimental Entanglement and Nonlocality of a Two-Photon Six-Qubit Cluster State
• Generation of high-fidelity four-photon cluster state and quantum-domain demonstration of one-way quantum computing
• Scalable Generation of Graph-State Entanglement through Realistic Linear Optics
• Experimental realization of a quantum game on a one-way quantum computer
• Symmetry constraints on temporal order in measurement-based quantum computation

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