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Deterministic entanglement and tomography of ion-spin qubits

Abstract:
We 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.
Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1088/1367-2630/8/9/188

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Institution:
University of Oxford
Department:
Centre for Quantum Computation
Role:
Author
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Institution:
University of Oxford
Department:
Centre for Quantum Computation
Role:
Author
More by this author
Institution:
University of Oxford
Department:
Centre for Quantum Computation
Role:
Author
More by this author
Institution:
University of Oxford
Department:
Centre for Quantum Computation
Role:
Author
More by this author
Institution:
University of Oxford
Department:
Centre for Quantum Computation
Role:
Author
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Contributors

Engineering and Physical Sciences Research Council More from this funder
Royal Society More from this funder
European Union More from this funder
National Security Agency More from this funder
Publisher:
Institute of Physics Publisher's website
Journal:
New Journal of Physics Journal website
Volume:
8
Article number:
188
Publication date:
2006-09-01
DOI:
EISSN:
1367-2630
Language:
English
Subjects:
UUID:
uuid:33bfb527-2579-447c-8cb1-01e35992051c
Local pid:
ora:2874
Deposit date:
2009-08-17

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