J P Home et al 2006 New J. Phys. 8 188 doi:10.1088/1367-2630/8/9/188
Deterministic entanglement and tomography of ion–spin qubits
J P Home, M J McDonnell, D M Lucas, G Imreh, B C Keitch, D J Szwer, N R Thomas, S C Webster, D N Stacey and A M Steane1
Show affiliationsWe have implemented a universal quantum logic gate between qubits stored in the spin state of a pair of trapped 40Ca ions. An initial product state was driven to a maximally entangled state deterministically, with 83% fidelity. We present a general approach to quantum state tomography which achieves good robustness to experimental noise and drift, and use it to measure the spin state of the ions. We find the entanglement of formation is 0.54.
- PACS
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03.65.Wj State reconstruction, quantum tomography
03.67.Lx Quantum computation architectures and implementations
03.67.Mn Entanglement measures, witnesses, and other characterizations
- Subjects
- Dates
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Issue 9 (September 2006)
Received 7 June 2006
Published 12 September 2006
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Deterministic entanglement and tomography of ion–spin qubits
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