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Creating and controlling global Greenberger-Horne-Zeilinger entanglement on quantum processors.
Zehang Bao1, Shibo Xu1, Zixuan Song1
1School of Physics, ZJU-Hangzhou Global Scientific and Technological Innovation Center, and Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control, Zhejiang University, Hangzhou, China.
Nature Communications
|October 11, 2024
Summary
Researchers created large-scale Greenberger-Horne-Zeilinger (GHZ) states, doubling qubit records. They preserved and manipulated these states using discrete time crystals (DTCs) for quantum computing advancements.
Area of Science:
- Quantum Physics
- Quantum Information Science
- Condensed Matter Physics
Background:
- Greenberger-Horne-Zeilinger (GHZ) states are fundamental to quantum mechanics and quantum applications.
- Scaling up GHZ states and maintaining their coherence are critical for advanced quantum computation but challenging due to noise vulnerability.
Purpose of the Study:
- To develop a general strategy for creating, preserving, and manipulating large-scale GHZ entanglement.
- To demonstrate this strategy using high-fidelity digital quantum circuits on superconducting processors.
Main Methods:
- Utilized a scalable protocol for initializing genuinely entangled GHZ states up to 60 qubits.
- Employed discrete time crystals (DTCs) and their tailor-made cat scar eigenstates for GHZ state protection and lifetime extension.
- Implemented in-situ quantum gates to manipulate DTC eigenstates and modify GHZ state protection effectiveness.
Main Results:
- Successfully created GHZ states with up to 60 qubits, significantly advancing the size record.
- Demonstrated extended lifetime and enhanced protection of GHZ states by embedding them within DTC eigenstates.
- Showcased the ability to manipulate GHZ state protection using quantum gates.
Conclusions:
- Established a viable pathway for coherent operations on large-scale GHZ entanglement.
- Highlighted superconducting processors as a promising platform for exploring nonequilibrium quantum matter and emerging quantum applications.
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