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Quantum communication through an unmodulated spin chain.

Sougato Bose1

  • 1Institute for Quantum Information, MC 107-81, California Institute of Technology, Pasadena, California 91125-8100, USA.

Physical Review Letters
|December 20, 2003
PubMed
Summary
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We present a novel quantum communication scheme using spin chains to transmit qubits with high fidelity over short distances. This method also enables sharing entanglement between distant spins, enhancing quantum networks.

Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Quantum Communication

Background:

  • Quantum communication relies on transmitting quantum states (qubits) between locations.
  • Spin chains are potential candidates for quantum channels due to their inherent quantum properties.
  • Achieving high-fidelity state transfer and entanglement distribution is crucial for quantum technologies.

Purpose of the Study:

  • To propose and analyze a scheme for quantum communication using an unmodulated spin chain.
  • To determine the fidelity of quantum state transfer and shared entanglement within this scheme.
  • To assess the practical feasibility of this method for short-distance quantum networks.

Main Methods:

  • Utilizing an arbitrary Heisenberg ferromagnet spin chain as a quantum channel.

Related Experiment Videos

  • Deriving analytical expressions for quantum state transfer fidelity and entanglement.
  • Applying the scheme to an open-ended chain with nearest-neighbor interactions.
  • Expressing fidelity using inverse discrete cosine transform and Bessel function series.

    • Main Results:

    • Demonstrated high-fidelity qubit transmission (better than classical) over chains up to 80 spins.
    • Quantified the fidelity of quantum state transfer as a function of time and chain length.
    • Showcased the capability of sharing distillable entanglement over arbitrary distances.
    • Identified specific mathematical forms (inverse discrete cosine transform, Bessel series) for fidelity.

    Conclusions:

    • The proposed spin chain scheme offers a viable method for short-distance quantum communication.
    • The channel facilitates efficient quantum state transfer and entanglement distribution.
    • This approach holds promise for building scalable quantum networks and enhancing quantum technologies.