Downloading Many-Qubit Entanglement from Continuous-Variable Cluster States

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.