Error-resistant distributed quantum computation in a trapped ion chain

Braungardt, Sibylle ; Sen(De), Aditi ; Sen, Ujjwal ; Lewenstein, Maciej (2007) Error-resistant distributed quantum computation in a trapped ion chain Physical Review A, 76 (4). ISSN 0031-899X (print); 1536-6065 (web)

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We consider experimentally feasible chains of trapped ions with pseudo-spin 1/2, and find models that can potentially be used to implement error-resistant quantum computation. Similar in spirit to classical neural networks, the error-resistance of the system is achieved by encoding the qubits distributed over the whole system. We therefore call our system a ''quantum neural network'', and present a ''quantum neural network model of quantum computation''. Qubits are encoded in a few quasi-degenerated low energy levels of the whole system, separated by a large gap from the excited states, and large energy barriers between themselves. We investigate protocols for implementing a universal set of quantum logic gates in the system, by adiabatic passage of a few low-lying energy levels of the whole system. Naturally appearing and potentially dangerous distributed noise in the system leaves the fidelity of the computation virtually unchanged, if it is not too strong. The computation is also naturally resilient to local perturbations of the spins.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society (APS)
ID Code:125870
Deposited On:12 Oct 2022 11:50
Last Modified:12 Oct 2022 11:50

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