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Quantum walks on a programmable two-dimensional 62-qubit superconducting processor.

Ming Gong1,2,3, Shiyu Wang1,2,3, Chen Zha1,2,3

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Researchers demonstrated high-fidelity quantum walks on a superconducting qubit array. This advancement in quantum simulation paves the way for larger-scale quantum applications.

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Area of Science:

  • Quantum Computing
  • Quantum Simulation
  • Condensed Matter Physics

Background:

  • Quantum walks are quantum analogs of classical random walks.
  • They are crucial for quantum simulations, search algorithms, and universal quantum computing.
  • Superconducting qubits offer a promising platform for implementing quantum dynamics.

Purpose of the Study:

  • To design and fabricate a superconducting qubit array for quantum walk experiments.
  • To demonstrate high-fidelity single- and two-particle quantum walks.
  • To implement and study quantum interference phenomena using a Mach-Zehnder interferometer on the quantum processor.

Main Methods:

  • Fabrication of an 8x8 two-dimensional square superconducting qubit array with 62 functional qubits.
  • Demonstration of high-fidelity single- and two-particle quantum walks.
  • Implementation of a programmable Mach-Zehnder interferometer to observe quantum interference.

Main Results:

  • Successful high-fidelity execution of single- and two-particle quantum walks.
  • Observation of interference fringes with single and double walkers in the Mach-Zehnder interferometer.
  • Demonstration of controlled quantum interference by tuning path disorders.

Conclusions:

  • The developed superconducting qubit array enables advanced quantum walk demonstrations.
  • This work represents a significant step towards realizing larger-scale quantum applications on noisy intermediate-scale quantum processors.
  • The high programmability facilitates complex quantum simulations and interference studies.