Decoherence of a tunable capacitively shunted flux qubit
| Title: | Decoherence of a tunable capacitively shunted flux qubit |
|---|---|
| Authors: | Robbyn Trappen; Xi Dai; M. Ali Yurtalan; Denis Melanson; Daniel M. Tennant; Antonio J. Martinez; Yongchao Tang; Joseph Gibson; Jeffrey A. Grover; Steven M. Disseler; James I. Basham; Rabindra Das; David K. Kim; Alexander J. Melville; Bethany M. Niedzielski; Cyrus F. Hirjibehedin; Kyle Serniak; Steven J. Weber; Jonilyn L. Yoder; William D. Oliver; Daniel A. Lidar; Adrian Lupascu |
| Source: | Communications Physics, Vol 8, Iss 1, Pp 1-10 (2025) |
| Publisher Information: | Nature Portfolio |
| Publication Year: | 2025 |
| Collection: | Directory of Open Access Journals: DOAJ Articles |
| Subject Terms: | Astrophysics; QB460-466; Physics; QC1-999 |
| Description: | Quantum annealing is a method to solve optimization problems that leverages quantum tunneling in a coupled qubit system. We present a detailed study of the coherence of a tunable capacitively-shunted flux qubit, designed for coherent quantum annealing applications. We find that for high qubit frequencies, thermal noise in the bias line makes a significant contribution to the relaxation, arising from the design choice to experimentally explore both fast annealing and high-frequency control. The measured dephasing rate is primarily due to intrinsic low-frequency flux noise in the two qubit loops, with additional contribution from the low-frequency noise of control electronics used for fast annealing. Our results characterize decoherence in a realistic setup for quantum annealing and are relevant for ongoing efforts toward building superconducting quantum annealers with increased coherence. |
| Document Type: | article in journal/newspaper |
| Language: | English |
| Relation: | https://doi.org/10.1038/s42005-025-02360-2; https://doaj.org/toc/2399-3650; https://doaj.org/article/8ea43d6864d04ddbb5fd65ca7e93158a |
| DOI: | 10.1038/s42005-025-02360-2 |
| Availability: | https://doi.org/10.1038/s42005-025-02360-2; https://doaj.org/article/8ea43d6864d04ddbb5fd65ca7e93158a |
| Accession Number: | edsbas.5B3FFB5E |
| Database: | BASE |