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Improved superconducting qubit coherence using titanium nitride
Open accessAbstract
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.
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Cites
Strong coupling of a single photon to a superconducting qubit using circuit quantum electrodynamics
Wallraff, A., Schuster, D. I., Blais, A., Frunzio, L., Huang, R. S., Majer, J., Kumar, S., Girvin, S. M., & Schoelkopf, R. J. (2004) · Nature · doi:10.1038/nature02851 · Cited by 3,796
Decoherence in Josephson Qubits from Dielectric Loss
Martinis, J. M., Cooper, K. B., McDermott, R., Steffen, M., Ansmann, M., Osborn, K. D., Cicak, K., Oh, S., Pappas, D. P., Simmonds, R. W., et al. (2005) · Physical Review Letters · doi:10.1103/physrevlett.95.210503 · Cited by 838
Self-citationProtecting superconducting qubits from radiation
Córcoles, A. D., Chow, J. M., Gambetta, J. M., Rigetti, C., Rozen, J. R., Keefe, G. A., Beth Rothwell, M., Ketchen, M. B., & Steffen, M. (2011) · Applied Physics Letters · doi:10.1063/1.3658630 · Cited by 193
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Cited by
Superconducting Qubits: Current State of Play
Kjaergaard, M., Schwartz, M. E., Braumüller, J., Krantz, P., Wang, J. I.-J., Gustavsson, S., & Oliver, W. D. (2020) · Annual Review of Condensed Matter Physics · doi:10.1146/annurev-conmatphys-031119-050605 · Cited by 1,544
Coherent Josephson Qubit Suitable for Scalable Quantum Integrated Circuits
Barends, R., Kelly, J., Megrant, A., Sank, D., Jeffrey, E., Chen, Y., Yin, Y., Chiaro, B., Mutus, J., Neill, C., et al. (2013) · Physical Review Letters · doi:10.1103/physrevlett.111.080502 · Cited by 779
Materials challenges and opportunities for quantum computing hardware
de Leon, N. P., Itoh, K. M., Kim, D., Mehta, K. K., Northup, T. E., Paik, H., Palmer, B. S., Samarth, N., Sangtawesin, S., & Steuerman, D. W. (2021) · Science · doi:10.1126/science.abb2823 · Cited by 710
The flux qubit revisited to enhance coherence and reproducibility
Yan, F., Gustavsson, S., Kamal, A., Birenbaum, J., Sears, A. P., Hover, D., Gudmundsen, T. J., Rosenberg, D., Samach, G., Weber, S., et al. (2016) · Nature Communications · doi:10.1038/ncomms12964 · Cited by 587
Towards understanding two-level-systems in amorphous solids: insights from quantum circuits
Müller, C., Cole, J. H., & Lisenfeld, J. (2019) · Reports on Progress in Physics · doi:10.1088/1361-6633/ab3a7e · Cited by 508
Metadata
- Authors
- Chang, J. B., Vissers, M. R., Córcoles, A. D., Sandberg, M., Gao, J., Abraham, D. W., Chow, J. M., Gambetta, J. M., Beth Rothwell, M., Keefe, G. A., Steffen, M., & Pappas, D. P.
- Venue
- Applied Physics Letters
- Publisher
- AIP Publishing
- Published
- 2013-07-01
- Volume
- 103
- Issue
- 1
- ISSN
- 0003-6951 (ISSN-L)
- 1077-3118
- OpenAlex
- W2083516996
- Cited by
- 247
- References
- 3
- FWCI
- 27.24
- Type
- journal article
- Language
- en
- Open access
- green
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- Chang, J. B., Vissers, M. R., Córcoles, A. D., Sandberg, M., Gao, J., Abraham, D. W., Chow, J. M., Gambetta, J. M., Beth Rothwell, M., Keefe, G. A., Steffen, M., & Pappas, D. P. (2013). Improved superconducting qubit coherence using titanium nitride. Applied Physics Letters. https://doi.org/10.1063/1.4813269
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