Study of material loss channels in tantalum microwave superconducting resonators

Dutta, A.; Place, Alexander; Crowley, K. D.; Le, Xuan Hoang; Gang, Youqi; Rodgers, Lila V. H.; Madhavan, Trisha; Khedkar, N. P.; Gui, X.; Jia, Y.; Baker, L.; Head, A.; Jarrige, Ignace; Hunt, Adrian; Waluyo, Iradwikanari; Barbour, Andi; Hulbert, S.; Liu, M.; Walter, A. L.; Cava, R. J.; Houck, Andrew; Leon, N. P. de

doi:10.1364/quantum.2022.qtu2a.25

Cited by 1 publication

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“…HFSS simulations and subsequent capacitance matrix inversion analysis suggest that the coupling matrix elements exhibit the same range of tunability, and estimates of the loss suggest that the gate oxides limit the lifetime of the coupler to nearly ten µs and the top InGaAs layer limits coupler lifetimes to several tens of µs. Low loss gate dielectrics such as tantalum oxide [44] and hexagonal boron nitride [45], along with improvements in the fabrication of the III-V stack may increase these coherence limits in the near term. Subsequent design iterations may look to reduce the parasitic capacitances with geometric optimization techniques to maximize contrast and minimize stray interactions [46].…”

Section: Discussionmentioning

confidence: 99%

Tunable capacitor for superconducting qubits using an InAs/InGaAs heterostructure

Materise¹,

Dartiailh²,

Strickland³

et al. 2023

Quantum Sci. Technol.

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Adoption of fast, parametric coupling elements has improved the performance of superconducting qubits, enabling recent demonstrations of quantum advantage in randomized sampling problems. The development of low loss, high contrast couplers is critical for scaling up these systems. We present a blueprint for a gate-tunable coupler realized with a two-dimensional electron gas in an InAs/InGaAs heterostructure. Rigorous numerical simulations of the semiconductor and high frequency electromagnetic behavior of the coupler and microwave circuitry yield an on/off ratio of more than one order of magnitude. We give an estimate of the dielectric-limited loss from the inclusion of the coupler in a two qubit system, with coupler coherences ranging from a few to tens of microseconds.

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Section: Discussionmentioning

confidence: 99%

Tunable capacitor for superconducting qubits using an InAs/InGaAs heterostructure

Materise¹,

Dartiailh²,

Strickland³

et al. 2023

Quantum Sci. Technol.

View full text Add to dashboard Cite

show abstract

Study of material loss channels in tantalum microwave superconducting resonators

Abstract: We identify candidate loss channels in tantalum by correlating X-ray photoelectron spectroscopy measurements with power and temperature dependent variation of the quality factor of superconducting coplanar waveguide microwave resonators.

Cited by 1 publication

References 2 publications

Tunable capacitor for superconducting qubits using an InAs/InGaAs heterostructure

Tunable capacitor for superconducting qubits using an InAs/InGaAs heterostructure

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