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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Qudit Dynamical Decoupling on a Superconducting Quantum Processor.

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This summary is machine-generated.

Multilevel qudit systems offer greater information capacity but face decoherence challenges. This study introduces dynamical decoupling protocols to protect qudits, significantly improving quantum state fidelity for scalable quantum computing.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing Architectures
  • Superconducting Quantum Systems

Background:

  • Multilevel qudit systems offer advantages over traditional qubits for quantum information processing.
  • Qudits are more vulnerable to decoherence, noise, and crosstalk, hindering their practical application.
  • Dynamical decoupling (DD) is a crucial technique for mitigating decoherence in quantum systems.

Purpose of the Study:

  • To develop and experimentally validate dynamical decoupling protocols for multilevel qudit systems.
  • To address the increased susceptibility of qudits to decoherence and crosstalk.
  • To enhance the fidelity and scalability of qudit-based quantum computing.

Main Methods:

  • Development of DD protocols for qudit systems utilizing the Heisenberg-Weyl group.
  • Experimental implementation and verification on a superconducting transmon processor supporting qutrits (d=3) and ququarts (d=4).
  • Application of single-qudit DD sequences to combat system-bath decoherence and two-qudit DD sequences to suppress cross-Kerr interactions.

Main Results:

  • Successful demonstration of single-qudit DD sequences protecting qutrits and ququarts from decoherence.
  • Implementation of two-qudit DD sequences effectively suppressing cross-Kerr couplings.
  • Significant improvement in the fidelity of time-evolved qutrit Bell states was achieved.

Conclusions:

  • Dynamical decoupling protocols based on the Heisenberg-Weyl group are effective for protecting qudit systems.
  • Experimental validation on superconducting processors confirms the utility of DD for qudit decoherence mitigation.
  • These findings pave the way for scalable qudit-based quantum computing by enhancing quantum state stability.