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Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Photonics

Background:

  • Developing components for quantum information processing is crucial.
  • Microwave photons are a promising platform for quantum computing.
  • Superconducting quantum interference devices (SQUIDs) offer tunable properties.

Purpose of the Study:

  • To introduce and experimentally demonstrate a magnetic-flux-tunable phase shifter for propagating microwave photons.
  • To enable arbitrary single-qubit gates for microwave photon qubits.
  • To contribute to the development of an all-microwave quantum computer.

Main Methods:

  • Utilizing three equidistant superconducting quantum interference devices (SQUIDs) on a transmission line.
  • Experimentally implementing and characterizing the phase shifter's performance.
  • Integrating the phase shifter with existing components like beam splitters.

Main Results:

  • The phase shifter demonstrated a broad range of tunable phase shifts.
  • Full transmission was achieved within experimental uncertainty.
  • The device's tunability was confirmed through experimental validation.

Conclusions:

  • The developed phase shifter is a key component for implementing arbitrary single-qubit gates.
  • This work advances the realization of all-microwave quantum computers.
  • The results complement existing single-photon sources and detectors for photonic quantum systems.