Phys. Rev. Lett. 103, 240504 (2009) [4 pages]Cluster-State Quantum Computing Enhanced by High-Fidelity Generalized MeasurementsReceived 11 September 2009; published 11 December 2009 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 different computations, the average output fidelity is 0.9832±0.0002; furthermore the error contribution from our POVM device and feedforward is only of O(10-3), less than some recent thresholds for fault-tolerant cluster computing. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.240504
DOI:
10.1103/PhysRevLett.103.240504
PACS:
03.67.Lx, 03.65.Ta, 42.50.Ex
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