Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.240504
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Funding
- Mike and Ophelia Lazaridis
- EPSRC
- U. S. Army Research Office
- NSERC
- OCE
- CFI
- Engineering and Physical Sciences Research Council [EP/G016828/1] Funding Source: researchfish
- EPSRC [EP/G016828/1] Funding Source: UKRI
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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.
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