Deterministic entanglement and tomography of ion-spin qubits

Deterministic entanglement and tomography of ion-spin qubits

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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...

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Hlavní autoři: Home, J, McDonnell, M, Lucas, D, Imreh, G, Keitch, B, Szwer, D, Thomas, N, Webster, S, Stacey, D, Steane, A
Médium: Journal article
Vydáno: 2006
Popis
Shrnutí: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. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

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