Coherent-state transfer via highly mixed quantum spin chains

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.032304· OSTI ID:21537400

Cappellaro, Paola; Viola, Lorenza; Ramanathan, Chandrasekhar ^[1]

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1. Nuclear Science and Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

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.

• OSTI ID: 21537400
• Journal Information: Physical Review. A, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevA.83.032304; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DEFECTS
DIAMONDS
EXCITATION
HAMILTONIANS
INTERACTIONS
MIXED STATE
NUCLEAR MAGNETIC RESONANCE
QUANTUM INFORMATION
QUANTUM WIRES
SOLIDS
SPIN
TRANSMISSION
ANGULAR MOMENTUM
CARBON
ELEMENTS
ENERGY-LEVEL TRANSITIONS
INFORMATION
MAGNETIC RESONANCE
MATHEMATICAL OPERATORS
MINERALS
NANOSTRUCTURES
NONMETALS
PARTICLE PROPERTIES
QUANTUM OPERATORS
RESONANCE