Transmission of quantum states through disordered channels with dimerized defects

We study a quantum-state transfer protocol between two end spins of a disordered spin-1/2 chain. We particularly evaluate the performance of the channel when it is subjected to short-range correlated on-site fluctuations. This is implemented by generating a random distribution of dimer-like defects...

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Bibliographic Details
Published in:Quantum information processing 2019-11, Vol.18 (11), p.1-12, Article 350
Main Authors: Almeida, Guilherme M. A., Lyra, Marcelo L., de Moura, Francisco A. B. F.
Format: Article
Language:English
Subjects:
Chains
Data Structures and Information Theory
Defects
Dimers
Mathematical Physics
Physics
Physics and Astronomy
Quantum Computing
Quantum Information Technology
Quantum Physics
Spintronics
Variation
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Summary:We study a quantum-state transfer protocol between two end spins of a disordered spin-1/2 chain. We particularly evaluate the performance of the channel when it is subjected to short-range correlated on-site fluctuations. This is implemented by generating a random distribution of dimer-like defects across the chain featuring a given on-site potential W . By numerically evaluating the system’s natural time evolution, we report the possibility of carrying out high-fidelity quantum-state transmission from one end to another given their local frequency is set ε ∼ W and W is within the energy band of the defectless chain.
ISSN:1570-0755
1573-1332
DOI:10.1007/s11128-019-2464-6