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Coherent-state transfer via highly mixed quantum spin chains

Author(s)
Cappellaro, Paola; Viola, Lorenza; Ramanathan, Chandrasekhar
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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.
Date issued
2011-03
URI
http://hdl.handle.net/1721.1/65561
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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
ISSN
1050-2947
1094-1622

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