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Flux-tunable phase shifter for microwaves



Roope J. Kokkoniemi, Tuomas Ollikainen, Sakari Saarenpaa, Janne Kokkala, Ceren Dag, Mikko Mottonen, Russell Lake


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.
Nature - Scientific Reports


quantum information, microwave photons


Kokkoniemi, R. , Ollikainen, T. , Saarenpaa, S. , Kokkala, J. , Dag, C. , Mottonen, M. and Lake, R. (2017), Flux-tunable phase shifter for microwaves, Nature - Scientific Reports, [online], (Accessed June 17, 2024)


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Created November 6, 2017, Updated January 4, 2022