Improved superconducting qubit coherence using titanium nitride
By J. Chang, Michael R. Vissers, A. C'orcoles, M. Sandberg, J. Gao, D. Abraham, Jerry M. Chow, Jay M. Gambetta, M. Rothwell, G. Keefe and 2 more. 2013
230 citations recorded by the source corpus.
We demonstrate enhanced relaxation and dephasing times of transmon qubits, up to ∼60 μs, by fabricating the interdigitated shunting capacitors using titanium nitride (TiN). Compared to qubits made with lift-off aluminum deposited simultaneously with the Josephson junction, this represents as much as a six-fold improvement and provides evidence that surface losses from two-level system (TLS) defects residing at or near interfaces contribute to decoherence. Concurrently, we observe an anomalous temperature dependent frequency shift of TiN resonators, which is inconsistent with the predicted TLS model.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/5a9301dcb4020d63846d45a0afd61b8760300266
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In Artificial Intelligence
- Göran Wendin
- Steven M. Girvin
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- Craig Gidney
- Franco Nori
- John M. Martinis
- Austin G. Fowler
- Kohei M. Itoh
In Atomic and Molecular Physics, and Optics
- Göran Wendin
- Steven M. Girvin
- Robert J. Schoelkopf
- Franco Nori
- Craig Gidney
- John M. Martinis
- Evan Jeffrey
- Austin G. Fowler
Citations in the corpus
- Circuit QED: Superconducting Qubits Coupled to Microwave Photons (2015, background): “…coherence times of such superposition states has risen more than four orders of magnitude from nanoseconds for the first superconducting qubit created in 1999 (Nakamura et al., 1999) up to ∼ 30 − 150 microseconds today (Paik et al., 2011; Rigetti et al., 2012; Chang et al., 2013; Barends et al., ).”
- Materials challenges and opportunities for quantum computing hardware (2021, background): “The pursuit of non-Abelian MZMs in topological superconductors has involved measurements of a rich variety of materials, including vortices at topological insulator/superconductor heterointerfaces such as Bi 2 Se 3 /NbSe 2 ( 327 , 328 ), magnetictopologicalinsulator/superconductor devicessuchasCr-do”
- Transmon qubit with relaxation time exceeding 0.5 milliseconds (2021, methodology): “Elemental materials of Nb[9,10], Al[3,11], Ta[12] and compound materials of TiN[13], NbN[14], NbTiN[15], and ganular aluminum[16] are currently used.”
- Qubit compatible superconducting interconnects (2017, background): “64 Kandhas also been shown tobe a viable high-coherence qubitmaterial [20, 21].”