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Related Experiment Videos

Accumulation of entanglement in a continuous variable memory.

M Paternostro1, M S Kim, G M Palma

  • 1School of Mathematics and Physics, Queen's University, Belfast BT7 1NN, United Kingdom.

Physical Review Letters
|May 16, 2007
PubMed
Summary
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Researchers demonstrate accumulating significant quantum entanglement in a memory system using continuous variable systems and a qubit mediator. This novel protocol achieves entanglement beyond one ebit without requiring pre-shared entangled resources, showcasing practical implementation potential.

Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Computing

Background:

  • Quantum entanglement is a fundamental resource for quantum information processing.
  • Continuous variable (CV) systems offer unique advantages for quantum memory applications.
  • Mediated coupling via qubits provides a pathway for indirect interactions between quantum systems.

Purpose of the Study:

  • To investigate the accumulation of quantum entanglement in a memory composed of two CV systems coupled indirectly via a qubit.
  • To explore entanglement generation exceeding one ebit without utilizing pre-existing entangled resources.
  • To assess the feasibility and identify key imperfections in the proposed entanglement accumulation protocol.

Main Methods:

  • Utilizing two continuous variable quantum systems as a quantum memory.

Related Experiment Videos

  • Employing a qubit as a mediator to establish indirect coupling between the CV systems.
  • Analyzing entanglement dynamics and quantifying generated entanglement (e.g., using entropy of entanglement or concurrence).

    • Main Results:

    • Demonstrated the accumulation of entanglement superior to one ebit in the CV memory.
    • Showcased that significant entanglement can be generated without initial entangled resources.
    • Identified and evaluated the impact of dominant imperfections on the entanglement accumulation process.

    Conclusions:

    • The proposed protocol offers a practical route for generating substantial quantum entanglement in CV quantum memories.
    • This method bypasses the need for pre-shared entangled states, simplifying experimental requirements.
    • The findings pave the way for scalable quantum memory architectures and improved quantum information processing.