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Updated: Feb 19, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
Flux-tunable phase shifter for microwaves
Roope Kokkoniemi1, Tuomas Ollikainen2, Russell E Lake2,3
1QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University, FI-00076, Aalto, Finland. roope.kokkoniemi@aalto.fi.
Abstract:
We introduce a magnetic-flux-tunable phase shifter for propagating microwave photons, based on three equidistant superconducting quantum interference devices (SQUIDs) on a transmission line. We experimentally implement the phase shifter and demonstrate that it produces a broad range of phase shifts and full transmission within the experimental uncertainty. Together with previously demonstrated beam splitters, this phase shifter can be utilized to implement arbitrary single-qubit gates for qubits based on propagating microwave photons. These results complement previous demonstrations of on-demand single-photon sources and detectors, and hence assist in the pursuit of an all-microwave quantum computer based on propagating photons.
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