Estarellas, Marta P., D'Amico, Irene orcid.org/0000-0002-4794-1348 and Spiller, Timothy P. orcid.org/0000-0003-1083-2604 (2017) Robust quantum entanglement generation and generation-plus-storage protocols with spin chains. Physical Review A. 042335. ISSN 1094-1622
Abstract
Reliable quantum communication and/or processing links between modules are a necessary building block for various quantum processing architectures. Here we consider a spin-chain system with alternating strength couplings and containing three defects, which impose three domain walls between topologically distinct regions of the chain. We show that - in addition to its useful, high-fidelity, quantum state transfer properties - an entangling protocol can be implemented in this system, with optional localization and storage of the entangled states. We demonstrate both numerically and analytically that, given a suitable initial product-state injection, the natural dynamics of the system produces a maximally entangled state at a given time. We present detailed investigations of the effects of fabrication errors, analyzing random static disorder both in the diagonal and off-diagonal terms of the system Hamiltonian. Our results show that the entangled state formation is very robust against perturbations of up to ∼10% the weaker chain coupling, and also robust against timing injection errors. We propose a further protocol, which manipulates the chain in order to localize and store each of the entangled qubits. The engineering of a system with such characteristics would thus provide a useful device for quantum information processing tasks involving the creation and storage of entangled resources.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2017 American Physical Society |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 25 May 2017 08:45 |
Last Modified: | 25 Dec 2024 00:15 |
Published Version: | https://doi.org/10.1103/PhysRevA.95.042335 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevA.95.042335 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:116920 |
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Filename: PhysRevA.95.042335.pdf
Description: Robust quantum entanglement generation and generation-plus-storage protocols with spin chains
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Description: PRAEstarellas