Dynamical Decoupling and Dephasing in Interacting Two-Level Systems
We implement dynamical decoupling techniques to mitigate noise and enhance the lifetime of an entangled state that is formed in a superconducting flux qubit coupled to a microscopic two-level system. By rapidly changing the qubit’s transition frequency relative to the two-level system, we realize a...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/72208 https://orcid.org/0000-0002-7069-1025 https://orcid.org/0000-0002-4674-2806 https://orcid.org/0000-0002-4436-6886 |
| _version_ | 1826216033539588096 |
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| author | Bylander, Jonas Gustavsson, Simon Oliver, William D. Orlando, Terry Philip Yan, Fei Nakamura, Yasunobu Yoshihara, Fumiki |
| author2 | Lincoln Laboratory |
| author_facet | Lincoln Laboratory Bylander, Jonas Gustavsson, Simon Oliver, William D. Orlando, Terry Philip Yan, Fei Nakamura, Yasunobu Yoshihara, Fumiki |
| author_sort | Bylander, Jonas |
| collection | MIT |
| description | We implement dynamical decoupling techniques to mitigate noise and enhance the lifetime of an entangled state that is formed in a superconducting flux qubit coupled to a microscopic two-level system. By rapidly changing the qubit’s transition frequency relative to the two-level system, we realize a refocusing pulse that reduces dephasing due to fluctuations in the transition frequencies, thereby improving the coherence time of the entangled state. The coupling coherence is further enhanced when applying multiple refocusing pulses, in agreement with our 1/f noise model. The results are applicable to any two-qubit system with transverse coupling and they highlight the potential of decoupling techniques for improving two-qubit gate fidelities, an essential prerequisite for implementing fault-tolerant quantum computing. |
| first_indexed | 2024-09-23T16:41:14Z |
| format | Article |
| id | mit-1721.1/72208 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:41:14Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/722082022-09-29T20:46:41Z Dynamical Decoupling and Dephasing in Interacting Two-Level Systems Bylander, Jonas Gustavsson, Simon Oliver, William D. Orlando, Terry Philip Yan, Fei Nakamura, Yasunobu Yoshihara, Fumiki Lincoln Laboratory Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Research Laboratory of Electronics Orlando, Terry Philip Bylander, Jonas Gustavsson, Simon Oliver, William D. Orlando, Terry Philip Yan, Fei We implement dynamical decoupling techniques to mitigate noise and enhance the lifetime of an entangled state that is formed in a superconducting flux qubit coupled to a microscopic two-level system. By rapidly changing the qubit’s transition frequency relative to the two-level system, we realize a refocusing pulse that reduces dephasing due to fluctuations in the transition frequencies, thereby improving the coherence time of the entangled state. The coupling coherence is further enhanced when applying multiple refocusing pulses, in agreement with our 1/f noise model. The results are applicable to any two-qubit system with transverse coupling and they highlight the potential of decoupling techniques for improving two-qubit gate fidelities, an essential prerequisite for implementing fault-tolerant quantum computing. U.S. Army Research Laboratory (grant no. W911NF-12-1-0036) National Science Foundation (U.S.) (PHY-1005373) 2012-08-20T12:50:41Z 2012-08-20T12:50:41Z 2012-07 2012-03 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/72208 Gustavsson, Simon et al. “Dynamical Decoupling and Dephasing in Interacting Two-Level Systems.” Physical Review Letters 109.1 (2012): 010502. © 2012 American Physical Society. https://orcid.org/0000-0002-7069-1025 https://orcid.org/0000-0002-4674-2806 https://orcid.org/0000-0002-4436-6886 en_US http://dx.doi.org/10.1103/PhysRevLett.109.010502 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Bylander, Jonas Gustavsson, Simon Oliver, William D. Orlando, Terry Philip Yan, Fei Nakamura, Yasunobu Yoshihara, Fumiki Dynamical Decoupling and Dephasing in Interacting Two-Level Systems |
| title | Dynamical Decoupling and Dephasing in Interacting Two-Level Systems |
| title_full | Dynamical Decoupling and Dephasing in Interacting Two-Level Systems |
| title_fullStr | Dynamical Decoupling and Dephasing in Interacting Two-Level Systems |
| title_full_unstemmed | Dynamical Decoupling and Dephasing in Interacting Two-Level Systems |
| title_short | Dynamical Decoupling and Dephasing in Interacting Two-Level Systems |
| title_sort | dynamical decoupling and dephasing in interacting two level systems |
| url | http://hdl.handle.net/1721.1/72208 https://orcid.org/0000-0002-7069-1025 https://orcid.org/0000-0002-4674-2806 https://orcid.org/0000-0002-4436-6886 |
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