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10-Qubit Entanglement and Parallel Logic Operations with a Superconducting Circuit.

Chao Song1,2, Kai Xu1,2, Wuxin Liu1

  • 1Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China.

Physical Review Letters
|December 9, 2017
PubMed
Summary
This summary is machine-generated.

Researchers created large-scale quantum entanglement using superconducting circuits. This work demonstrates the largest entangled Greenberger-Horne-Zeilinger states in solid-state systems, advancing quantum computation.

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Area of Science:

  • Quantum Information Science
  • Superconducting Circuits
  • Quantum Entanglement

Background:

  • Superconducting circuits are a leading platform for quantum computing.
  • Generating and controlling multi-qubit entangled states is crucial for quantum computation.
  • Previous efforts have been limited in the scale of entanglement achievable in solid-state systems.

Purpose of the Study:

  • To demonstrate the production of genuinely entangled Greenberger-Horne-Zeilinger (GHZ) states with up to ten qubits.
  • To utilize resonator-mediated interactions for controllable multi-qubit entanglement and parallel operations.
  • To perform quantum state tomography on the 10-qubit system to verify entanglement fidelity.

Main Methods:

  • Fabrication of a superconducting circuit with up to ten qubits coupled to a bus resonator.
  • Implementation of controlled qubit-qubit interactions mediated by the bus resonator.
  • Application of quantum state tomography to reconstruct the 10-qubit density matrix.

Main Results:

  • Successful production of genuinely entangled Greenberger-Horne-Zeilinger states with up to ten qubits.
  • Demonstration of parallel operations on different pairs of qubits.
  • Achieved a fidelity of 0.668±0.025 for the 10-qubit density matrix.

Conclusions:

  • This study reports the largest entanglement generated to date in solid-state architectures.
  • The demonstrated techniques pave the way for scalable quantum computation using superconducting circuits.
  • The results highlight the potential of resonator-mediated interactions for advanced quantum information processing.