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Efficient and perfect state transfer in quantum chains

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arxiv quant-ph/0410175 v3 pith:ZKR2E6ZG submitted 2004-10-22 quant-ph

Daniel Burgarth , Vittorio Giovannetti , Sougato Bose This is my paper · ORCID
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keywords chainsquantumqubitsefficientperfectstatetransferable
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abstract

We present a communication protocol for chains of permanently coupled qubits which achieves perfect quantum state transfer and which is efficient with respect to the number chains employed in the scheme. The system consists of $M$ uncoupled identical quantum chains. Local control (gates, measurements) is only allowed at the sending/receiving end of the chains. Under a quite general hypothesis on the interaction Hamiltonian of the qubits a theorem is proved which shows that the receiver is able to asymptotically recover the messages by repetitive monitoring of his qubits.

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  1. Spectral surgery and high-fidelity quantum state transfer in $XX$ chains

    quant-ph 2024-12 conditional novelty 6.0 of 10

    Spectral surgery on a uniform XX chain yields analytic spin chains that interpolate between uniform and Krawtchouk chains and achieve good-fidelity state transfer with bounded couplings.

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