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

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

2009-09-15

arxiv.org/abs/0909.2843v1

Phys. Rev. Lett. 103, 240504 (2009)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.240504

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.

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