Deterministic entanglement and tomography of ion-spin qubits
- 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.
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- Peer reviewed
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- IOP Publishing and Deutsche Physikalische Gesellschaft
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- Citation: Home, J. P. et al. (2006). 'Deterministic entanglement and tomography of ion-spin qubits', New Journal of Physics, 8, 188. [Available at http://www.iop.org/EJ/njp]. This is an Open Access article published under the terms of the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 licence (http://creativecommons.org/licenses/by-nc-sa/2.5/deed.en_GB). This licence permits third-party users to copy, distribute and display the published version of the article, and create derivative works, subject to appropriate acknowledgement of the original authors, and provided the article is not used for commercial purposes. If you alter, transform, or build upon this work, you may distribute the resulting work only under a licence identical to this one. For any reuse or distribution, you must make clear to others the licence terms of this work.
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