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Improved transfer of quantum information using a local memory.

Vittorio Giovannetti1, Daniel Burgarth

  • 1NEST-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy.

Physical Review Letters
|February 21, 2006
PubMed
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Quantum communication is enhanced by using quantum memory for signal storage before decoding. Perfect transfer is achieved with infinite memory, enabling arbitrary state transfer in spin chains.

Area of Science:

  • Quantum Information Science
  • Quantum Communication Protocols
  • Condensed Matter Physics

Background:

  • Quantum communication enables secure information transfer.
  • Quantum state transfer is crucial for quantum networks.
  • Heisenberg chains are fundamental models in quantum magnetism.

Purpose of the Study:

  • To investigate the impact of quantum memory on communication fidelity.
  • To explore the potential for perfect quantum state transfer.
  • To demonstrate a scheme for transferring arbitrary multipartite states in spin chains.

Main Methods:

  • Theoretical analysis of quantum communication protocols.
  • Development of a quantum memory-assisted decoding scheme.
  • Mathematical proof for state transfer in Heisenberg spin chains.

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Main Results:

  • Quantum memory significantly improves communication fidelity.
  • Perfect quantum state transfer is achievable with infinite memory.
  • The proposed scheme facilitates arbitrary multipartite state transfer along Heisenberg chains with random couplings.

Conclusions:

  • Quantum memory is a key resource for enhancing quantum communication.
  • The demonstrated scheme offers a robust method for quantum state transfer.
  • This work has implications for quantum networking and quantum computation.