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Downloading Many-Qubit Entanglement from Continuous-Variable Cluster States.

Zhihua Han1, Hoi-Kwan Lau1

  • 1Simon Fraser University, Department of Physics, Burnaby, British Columbia V5A 1S6, Canada.

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|February 16, 2026
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Summary
This summary is machine-generated.

We present a novel method to generate many-qubit entanglement from efficient continuous-variable (CV) states. This approach enables robust quantum computation (QC) and memory using common bosonic platform operations.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Computing

Background:

  • Scalable generation of many-body entanglement is crucial for quantum technologies but remains challenging on qubit platforms.
  • Continuous-variable (CV) entanglement generation is efficient but has limited utility for many-qubit applications.

Purpose of the Study:

  • To propose a scheme for downloading many-qubit entanglement from CV cluster states.
  • To enable efficient and scalable generation of useful quantum entanglement for quantum technologies.

Main Methods:

  • A protocol based on one-bit teleportation of qubit correlations in the displaced Gottesman-Kitaev-Preskill basis.
  • Development of an equivalent circuit to map CV errors to single-qubit preparation errors.
  • Relating finite squeezing error to qubit erasure.

Main Results:

  • Demonstrated a method to transfer many-qubit entanglement from CV states to qubit systems.
  • Quantified the required squeezing levels: 5.4 dB for robust quantum computation (QC) and 11.9 dB for fault-tolerant QC.
  • Showed the protocol's compatibility with common operations on bosonic platforms.

Conclusions:

  • The proposed scheme effectively combines the strengths of CV and qubit entanglement generation.
  • It offers a practical pathway towards scalable generation of many-body entanglement for quantum technologies.
  • The protocol is implementable on existing bosonic platforms, paving the way for advanced quantum applications.