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; A. M. Steane

doi:10.1088/1367-2630/8/9/188

Deterministic entanglement and tomography of ion spin qubits

Quantum Physics 2007-05-23 v2

Authors: 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 , A. M. Steane

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Abstract

We have implemented a universal quantum logic gate between qubits stored in the spin state of a pair of trapped calcium 40 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.

Keywords

quantum spin systems quantum entanglement

Cite

@article{arxiv.quant-ph/0603273,
  title  = {Deterministic entanglement and tomography of ion spin qubits},
  author = {J. P. Home and M. J. McDonnell and D. M. Lucas and G. Imreh and B. C. Keitch and D. J. Szwer and N. R. Thomas and S. C. Webster and D. N. Stacey and A. M. Steane},
  journal= {arXiv preprint arXiv:quant-ph/0603273},
  year   = {2007}
}

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3 figures, 4 pages, footnotes fixed

Deterministic entanglement and tomography of ion spin qubits

Abstract

Keywords

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