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Entanglement purification of gaussian continuous variable quantum states

Duan1, Giedke, Cirac

  • 1Institut fur Theoretische Physik, Universitat Innsbruck, A-6020 Innsbruck, Austria and Laboratory of Quantum Communication and Quantum Computation, University of Science and Technology of China, Hefei 230026, China.

Physical Review Letters
|October 6, 2000
PubMed
Summary

This study introduces an efficient entanglement purification protocol using quantum nondemolition measurements. The method generates high-fidelity entangled states from less pure sources for quantum information applications.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Entanglement Theory

Background:

  • Entangled states are crucial for quantum information processing.
  • Generating and maintaining high-fidelity entanglement is a significant challenge.
  • Existing methods often suffer from low efficiency or require complex setups.

Purpose of the Study:

  • To develop an efficient entanglement purification protocol.
  • To generate maximally entangled states from less pure Gaussian continuous variable entangled states.
  • To propose a practical optical implementation for the protocol.

Main Methods:

  • Utilizing a local quantum nondemolition (QND) measurement.
  • Measuring the total excitation number of several continuous variable entangled pairs.

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  • Employing cavity-enhanced cross-Kerr interactions for the QND measurement.

    • Main Results:

    • High efficiencies in generating maximally entangled states.
    • Applicability to both two-mode squeezed states and mixed Gaussian continuous entangled states.
    • Demonstration of a feasible optical scheme for the proposed measurement.

    Conclusions:

    • The proposed protocol offers a viable route to high-fidelity entanglement purification.
    • The optical scheme provides a practical pathway for experimental realization.
    • This work advances the capabilities for creating robust entangled states for quantum technologies.