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Published on: August 2, 2019
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Cross-platform comparison of arbitrary quantum states
D Zhu1,2,3,4, Z P Cian5,6,7, C Noel1,2,8,9,10
1Joint Quantum Institute, University of Maryland, College Park, MD, 20742, USA.
Nature Communications
|November 5, 2022
Summary
Validating quantum computers (QCs) is crucial for quantum advantage. This study compares QCs using randomized measurements, showing cross-platform state fidelity analysis offers insights into system performance.
Area of Science:
- Quantum Computing
- Quantum Information Science
Background:
- Quantum computers (QCs) are nearing quantum advantage, necessitating robust performance validation methods.
- Current validation often relies on specific algorithmic tasks, providing limited insight into generic QC performance.
- Comparing results across different QCs offers a path toward reliable, generic validation.
Purpose of the Study:
- To introduce and demonstrate a cross-platform comparison method for quantum computers.
- To assess the validity and agreement of quantum computations across diverse QC platforms.
- To analyze cross-platform state fidelities for a deeper understanding of QC systems.
Main Methods:
- Executing identical quantum circuits on multiple, physically distinct quantum computing platforms.
- Employing randomized and correlated measurement strategies for comprehensive data acquisition.
- Analyzing the resulting data to compute and compare cross-platform state fidelities.
Main Results:
- Demonstrated a method for comparing quantum computations across different physical QC platforms.
- Obtained a wealth of information regarding the performance and agreement of QC systems.
- Quantified cross-platform state fidelities, providing a metric for validation.
Conclusions:
- Cross-platform comparison using randomized measurements is an effective approach for validating quantum computers.
- State fidelity analysis across different QCs offers a generic validation strategy, akin to metrological standards.
- This work contributes to establishing trust and reliability in the emerging era of quantum advantage.
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