Decoherence in Josephson Qubits from Dielectric Loss
Open accessAbstract
Dielectric loss from two-level states is shown to be a dominant decoherence source in superconducting quantum bits. Depending on the qubit design, dielectric loss from insulating materials or the tunnel junction can lead to short coherence times. We show that a variety of microwave and qubit measurements are well modeled by loss from resonant absorption of two-level defects. Our results demonstrate that this loss can be significantly reduced by using better dielectrics and fabricating junctions of small area . With a redesigned phase qubit employing low-loss dielectrics, the energy relaxation rate has been improved by a factor of 20, opening up the possibility of multiqubit gates and algorithms.
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The qubit frequency as a function of applied magnetic flux did not exhibit any observable avoided crossings with strongly coupled TLS (more than 250 kHz).
“The qubit frequency as a function of the applied magnetic flux did not exhibit any observable avoided crossings with the strongly coupled TLS (more than 250 kHz; Supplementary Information), reminiscent of a TLS inside the JJ barrier47,48.”
From Advanced CMOS manufacturing of superconducting qubits on 300 mm wafers (2024) · cites this paper as [47]
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Self-citation
- Authors
- 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., & Yu, C. C.
- Affiliations
- University of California, Santa Barbara (US)
- National Institute of Standards and Technology (US)
- University of California, Irvine (US)
- ORCID
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2005-11-16
- Volume
- 95
- Issue
- 21
- Pages
- 210503-210503
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2110551800
- Cited by
- 838
- References
- 1
- Citations by year
- 2026: 58 · 2025: 64 · 2024: 54 · 2023: 44 · 2022: 39 · 2021: 50 · 2020: 43 · 2019: 39 · 2018: 25 · 2017: 32 · 2016: 42 · 2015: 37 · 2014: 30 · 2013: 49 · 2012: 33
- FWCI
- 27.11
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Science
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Superconducting and THz Device Technology
- Keywords
- decoherence, Josephson qubits, dielectric loss, superconducting qubits, phase qubit, energy relaxation rate, tunnel junctions, low-loss dielectrics, coherence time, resonant absorption
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