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

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.