Cluster-state quantum computing enhanced by high-fidelity generalized measurements

Abstract

We introduce and implement a technique to extend the quantum computational power of cluster states by replacing some projective measurements with generalized quantum measurements (POVMs). As an experimental demonstration we fully realize an arbitrary three-qubit cluster computation by implementing a tunable linear-optical POVM, as well as fast active feedforward, on a two-qubit photonic cluster state. Over 206 diferent computations, the average output fidelity is 0.9832 +/- 0.0002; furthermore the error contribution from our POVM device and feedforward is only of order 10e-3, less than some recent thresholds for fault-tolerant cluster computing.

arXiv comment4 pages, 4 figures

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• Experimental Realization of a Controlled-NOT Gate with Four-Photon Six-Qubit Cluster States
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• Quantum-Computing Architecture based on Large-Scale Multi-Dimensional Continuous-Variable Cluster States in a Scalable Photonic Platform
• Experimental Quantum Networking Protocols via Four-Qubit Hyperentangled Dicke States
• Derivation and experimental test of fidelity benchmarks for remote preparation of arbitrary qubit states
• Simulating all quantum measurements using only projective measurements and postselection
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• Experimental characterization of photonic fusion using fiber sources
• Linear-optics realization of channels for single-photon multimode qudits
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• Experimental Verification of Anisotropic Invariance for Three-Qubit States
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