Coherent-state transfer via highly mixed quantum spin chains
Name
Cappellaro-2011-Coherent-state trans.pdf
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1.29 MB
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Checksum (MD5)
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Author(s)
Cappellaro, Paola
Viola, Lorenza
Ramanathan, Chandrasekhar
Date Issued
March 2011
Journal
Physical Review A
Publisher
American Physical Society
Citation
Cappellaro, Paola, Lorenza Viola, and Chandrasekhar Ramanathan. “Coherent-state Transfer via Highly Mixed Quantum Spin Chains.” Physical Review A 83.3 (2011) ©2011 American Physical Society
Version
Final published version
Abstract
Spin chains have been proposed as quantum wires in many quantum-information processing architectures. Coherent transmission of quantum information in spin chains over short distances is enabled by their internal dynamics, which drives the transport of single-spin excitations in perfectly polarized chains. Given the practical challenge of preparing the chain in a pure state, we propose to use a chain that is initially in the maximally mixed state. We compare the transport properties of pure and mixed-state chains and find similarities that enable the experimental study of pure-state transfer via mixed-state chains. We also demonstrate protocols for the perfect transfer of quantum information in these chains. Remarkably, mixed-state chains allow the use of Hamiltonians that do not preserve the total number of single-spin excitations and are more readily obtainable from the naturally occurring magnetic dipolar interaction. We discuss experimental implementations using solid-state nuclear magnetic resonance and defect centers in diamond.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.83.032304
