Efficient and robust analysis of complex scattering data under noise in microwave resonators

Probst, Sebastian; Song, Fengbin; Bushev, Pavel; Ustinov, A. V.; Weides, Martin

doi:10.1063/1.4907935

Cited by 231 publications

(197 citation statements)

References 28 publications

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“…the quality factor of the microwave signal into the resonator at either port can be determined by performing a 'circle fit'. This is a fit in the complex plane of the individual reflection measurement from each port [37] and yields an additional factor ζ<1 to the external amplitude ratio for coupling into the cavity resonator. Then, δ 0 is calculated via δ 0 =ζ δ ext .…”

Section: Two-port Cavity Magnon-polariton Spectroscopymentioning

confidence: 99%

Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons

et al. 2019

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Cavity-magnon polaritons (CMPs) are the associated quasiparticles of the hybridization between cavity photons and magnons in a magnetic sample placed in a microwave resonator. In the strong coupling regime, where the macroscopic coupling strength exceeds the individual dissipation, there is a coherent exchange of information. This renders CMPs as promising candidates for future applications such as in information processing. Recent advances on the study of the CMP now allow not only for creation of CMPs on demand, but also for tuning of the coupling strength-this can be thought of as the enhancement or suppression of information exchange. Here, we go beyond standard single-port driven CMPs and employ a two-port driven CMP. We control the coupling strength by the relative phase f and amplitude field ratio δ 0 between both ports. Specifically, we derive a new expression from input-output theory for the study of the two-port driven CMP and discuss the implications on the coupling strength. Furthermore, we examine intermediate cases where the relative phase is tuned between its maximal and minimal value and, in particular, the high δ 0 regime, which has not been yet explored.

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Section: Two-port Cavity Magnon-polariton Spectroscopymentioning

confidence: 99%

Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons

et al. 2019

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“…After an additional stage of room temperature (RT) amplification, their transmission spectra are measured with a vector network analyzer (VNA). The resonators Q i , together with the coupling quality factor Q c and the resonance frequency, are extracted using the circle fit routine [23]. The measured and fitted amplitude and phase of one resonator transmission spectrum (sample vertical 1) are shown in figure 2.…”

Section: Methodsmentioning

confidence: 99%

Phononic loss in superconducting resonators on piezoelectric substrates

et al. 2020

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We numerically and experimentally investigate the phononic loss for superconducting resonators fabricated on a piezoelectric substrate. With the help of finite element method simulations, we calculate the energy loss due to electromechanical conversion into bulk and surface acoustic waves. This sets an upper limit for the resonator internal quality factor Q i . To validate the simulation, we fabricate quarter wavelength coplanar waveguide resonators on GaAs and measure Q i as function of frequency, power and temperature. We observe a linear increase of Q i with frequency, as predicted by the simulations for a constant electromechanical coupling. Additionally, Q i shows a weak power dependence and a negligible temperature dependence around 10 mK, excluding two level systems and non-equilibrium quasiparticles as the main source of losses at that temperature.

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“…The dashed line corresponds to averaged single photon level. Q i are fitted by standard methods [31]. In detail, a continuous ground plane is paved under the airbridge, which is forming a microstrip structure locally (b).…”

Section: Quality Factor Of Airbriged Resonatormentioning

confidence: 99%

Pseudo-2D superconducting quantum computing circuit for the surface code: proposal and preliminary tests

et al. 2020

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Among the major hardware platforms for large-scale quantum computing, one of the leading candidates is superconducting quantum circuits. Current proposed architectures for quantum error-correction with the promising surface code require a two-dimensional layout of superconducting qubits with nearest-neighbor interactions. A major hurdle for the scalability in such an architecture using superconducting systems is the so-called wiring problem, where qubits internal to a chipset become difficult to access by the external control/readout lines. In contrast to the existing approaches which address the problem through intricate three-dimensional wiring and packaging technology, leading to a significant engineering challenge, here we address this problem by presenting a modified microarchitecture in which all the wiring can be realized through a newly introduced pseudo two-dimensional resonator network which provides the inter-qubit connections via airbridges. Our proposal is completely compatible with current standard planar circuit technology. We carried out experiments to examine the feasibility of the new airbridge component. The measured quality factor of the airbridged resonator is below the simulated surface-code threshold required for a coupling resonator, and it should not limit simulated gate fidelity. The measured crosstalk between crossed resonators is at most −49 dB in resonance. Further spatial and frequency separation between the resonators should result in relatively limited crosstalk between them, which would not increase as the size of the chipset increases. This architecture and the preliminary tests indicate the possibility that a large-scale, fully error-corrected quantum computer could be constructed by monolithic integration technologies without additional overhead or special packaging know-how.

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Efficient and robust analysis of complex scattering data under noise in microwave resonators

Cited by 231 publications

References 28 publications

Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons

Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons

Phononic loss in superconducting resonators on piezoelectric substrates

Pseudo-2D superconducting quantum computing circuit for the surface code: proposal and preliminary tests

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