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Area of Science:

  • Quantum Computing
  • Superconducting Qubits
  • Quantum Entanglement

Background:

  • Superconducting processors are a leading platform for quantum computation.
  • Achieving and verifying genuine multipartite entanglement is crucial for scalable quantum computing.

Purpose of the Study:

  • To prepare and verify genuine 12-qubit entanglement in a superconducting processor.
  • To demonstrate a novel entangling circuit for generating linear cluster states.

Main Methods:

  • Fabrication of a superconducting processor with qubits arranged in a 1D chain.
  • Measurement of 12-qubit entanglement fidelity using a specific entangling circuit.
  • Thermal cycling to assess state fidelity changes.

Main Results:

  • Demonstrated genuine 12-qubit entanglement with fidelity above 0.5544±0.0025, exceeding the multipartite entanglement threshold by 21 standard deviations.
  • Achieved improved state fidelity above 0.707±0.008 after thermal cycling.
  • Developed a depth-invariant entangling circuit using single- and double-qubit gates.

Conclusions:

  • The results represent a substantial step towards large-scale random circuit sampling.
  • This work advances scalable measurement-based quantum computing.
  • The demonstrated 12-qubit entanglement is a key milestone for future quantum technologies.