Journal
SCIENCE
Volume 304, Issue 5676, Pages 1478-1480Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1097522
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We report the deterministic creation of maximally entangled three-qubit states - specifically the Greenberger- Horne- Zeilinger (GHZ) state and the W state - with a trapped-ion quantum computer. We read out one of the qubits selectively and show how GHZ and W states are affected by this local measurement. Additionally, we demonstrate conditional operations controlled by the results from reading out one qubit. Tripartite entanglement is deterministically transformed into bipartite entanglement by local operations only. These operations are the measurement of one qubit of a GHZ state in a rotated basis and, conditioned on this measurement result, the application of single-qubit rotations.
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