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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Quantum Information Science

Background:

  • Superconducting artificial atoms are key components in quantum computers, utilizing their lowest energy states as qubits.
  • Higher energy levels, while enabling gate operations, also introduce undesired interactions, specifically ZZ quantum crosstalk, during qubit coupling for entanglement.
  • This crosstalk limits the fidelity and scalability of current quantum computing architectures.

Purpose of the Study:

  • To present a novel technique for manipulating energy levels in superconducting qubits.
  • To mitigate ZZ quantum crosstalk by applying simultaneous off-resonant drives on coupled qubits.
  • To break the trade-off between qubit-qubit coupling strength and crosstalk in quantum hardware.

Main Methods:

  • Implementation of simultaneous off-resonant drives on coupled qubits in a fixed-frequency transmon architecture.
  • Utilizing cross-resonance drives for CNOT gate operations with crosstalk cancellation.
  • Employing a second set of off-resonant drives for a novel CZ gate implementation.

Main Results:

  • Achieved a 90 ns CNOT gate with a low error rate of (0.19±0.02)% in a strongly coupled transmon system with crosstalk cancellation.
  • Demonstrated a novel CZ gate enabled by the proposed off-resonant drive technique.
  • Showcased significant improvement in circuit performance with crosstalk cancellation across a seven-qubit system, indicating scalability.

Conclusions:

  • The presented technique effectively manipulates qubit energy levels to mitigate ZZ quantum crosstalk.
  • This method enables faster gate operations and enhanced multiqubit circuit fidelities in superconducting quantum hardware.
  • The demonstrated scalability suggests a promising path towards more powerful and reliable quantum computers.