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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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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.

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This summary is machine-generated.

Quantum crosstalk hinders quantum computing. Researchers developed a condition for robust single-qubit control, improving state preservation and noise characterization on real quantum devices.

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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.