title: Broadband sample holder for microwave spectroscopy of superconducting qubits.
abstract: We present a practical design and implementation of a broadband sample holder suitable for microwave experiments with superconducting integrated circuits at millikelvin temperatures. Proposed design can be easily integrated in standard dilution cryostats, has flat pass band response in a frequency range from 0 to 32 GHz, allowing the RF testing of the samples with substrate size up to 4 × 4 mm(2). The parasitic higher modes interference in the holder structure is analyzed and prevented via design considerations. The developed setup can be used for characterization of superconducting parametric amplifiers, bolometers, and qubits. We tested the designed sample holder by characterizing of a superconducting flux qubit at 20 mK temperature.
authors.affiliation: National University of Science and Technology (MISIS), Leninskiy prosp. 4, Moscow, 119049, Russia.
authors.forename: A S
authors.initials: AS
authors.lastname: Averkin
authors.affiliation: National University of Science and Technology (MISIS), Leninskiy prosp. 4, Moscow, 119049, Russia.
authors.forename: A
authors.initials: A
authors.lastname: Karpov
authors.affiliation: National University of Science and Technology (MISIS), Leninskiy prosp. 4, Moscow, 119049, Russia.
authors.forename: K
authors.initials: K
authors.lastname: Shulga
authors.affiliation: National University of Science and Technology (MISIS), Leninskiy prosp. 4, Moscow, 119049, Russia.
authors.forename: E
authors.initials: E
authors.lastname: Glushkov
authors.affiliation: National University of Science and Technology (MISIS), Leninskiy prosp. 4, Moscow, 119049, Russia.
authors.forename: N
authors.initials: N
authors.lastname: Abramov
authors.affiliation: Leibniz Institute of Photonic Technology (IPHT), PO Box 100239, D-07702 Jena, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Huebner
authors.affiliation: Russian Quantum Center (RQC), 100 Novaya St., Skolkovo, Moscow region, 143025, Russia.
authors.forename: E
authors.initials: E
authors.lastname: Il'ichev
authors.affiliation: National University of Science and Technology (MISIS), Leninskiy prosp. 4, Moscow, 119049, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Ustinov