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Quantum Crosstalk Robust Quantum Control
Zeyuan Zhou1, Ryan Sitler2, Yasuo Oda1
1William H. Miller III Department of Physics & Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Physical Review Letters
|December 10, 2023
Summary
Quantum crosstalk hinders quantum computing. Researchers developed a condition for robust single-qubit control, improving state preservation and noise characterization on real quantum devices.
Area of Science:
- Quantum Computing
- Quantum Control Theory
Background:
- Quantum crosstalk is a significant challenge in current quantum devices, limiting high-fidelity operations and reliable processing.
- Existing methods struggle to mitigate the effects of crosstalk in multiqubit systems.
Purpose of the Study:
- To develop an analytical condition for achieving crosstalk-robust single-qubit control in multiqubit systems.
- To demonstrate the practical application of this condition in enhancing quantum state preservation and noise characterization.
Main Methods:
- Utilized quantum control theory and cumulant expansion to derive a condition for suppressing leading-order crosstalk effects.
- Developed crosstalk-robust dynamical decoupling and quantum noise spectroscopy (QNS) protocols.
- Experimentally validated the condition on IBM Quantum Experience processors (27-qubit and 7-qubit systems).
Main Results:
- Demonstrated crosstalk-robust state preservation on 27 qubits, achieving up to a 3.5x improvement in coherence decay for various quantum states.
- Showcased crosstalk-robust dephasing QNS on a 7-qubit processor with a 10^4 improvement in reconstruction accuracy.
- Validated the effectiveness of the derived condition in suppressing crosstalk's detrimental effects.
Conclusions:
- The developed analytical condition effectively suppresses quantum crosstalk in multiqubit systems.
- This condition significantly enhances the fidelity of quantum state preservation and the accuracy of quantum noise characterization.
- The findings pave the way for improved multiqubit characterization and control in current quantum computing architectures.
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