Superconducting flux qubit capacitively coupled to an LC resonator
We study the system where a superconducting flux qubit is capacitively coupled to an LC resonator. In three devices with different coupling capacitance, the magnitude of the dispersive shift is enhanced by the third level of the qubit and quantitatively agrees with the theory. We show by numerical c...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2014-01-01
|
| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/16/1/015017 |
| _version_ | 1797751576641667072 |
|---|---|
| author | T Yamamoto K Inomata K Koshino P-M Billangeon Y Nakamura J S Tsai |
| author_facet | T Yamamoto K Inomata K Koshino P-M Billangeon Y Nakamura J S Tsai |
| author_sort | T Yamamoto |
| collection | DOAJ |
| description | We study the system where a superconducting flux qubit is capacitively coupled to an LC resonator. In three devices with different coupling capacitance, the magnitude of the dispersive shift is enhanced by the third level of the qubit and quantitatively agrees with the theory. We show by numerical calculation that the capacitive coupling plays an essential role for the enhancement in the dispersive shift. We investigate the coherence properties in two of these devices, which are in the strong-dispersive regime, and show that the qubit energy relaxation is currently not limited by the coupling. We also observe the discrete ac-Stark effect, a hallmark of the strong-dispersive regime, in accordance with the theory. |
| first_indexed | 2024-03-12T16:50:32Z |
| format | Article |
| id | doaj.art-586c41bc9a8045aebd3427bb6280ea26 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:50:32Z |
| publishDate | 2014-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-586c41bc9a8045aebd3427bb6280ea262023-08-08T11:20:53ZengIOP PublishingNew Journal of Physics1367-26302014-01-0116101501710.1088/1367-2630/16/1/015017Superconducting flux qubit capacitively coupled to an LC resonatorT Yamamoto0K Inomata1K Koshino2P-M Billangeon3Y Nakamura4J S Tsai5NEC Smart Energy Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan; RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, JapanRIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, JapanCollege of Liberal Arts and Sciences, Tokyo Medical and Dental University , 2-8-30 Konodai, Ichikawa 272-0827, JapanRIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, JapanRIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan; Research Center for Advanced Science and Technology, The University of Tokyo , Meguro-ku, Tokyo 153-8904, JapanNEC Smart Energy Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan; RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, JapanWe study the system where a superconducting flux qubit is capacitively coupled to an LC resonator. In three devices with different coupling capacitance, the magnitude of the dispersive shift is enhanced by the third level of the qubit and quantitatively agrees with the theory. We show by numerical calculation that the capacitive coupling plays an essential role for the enhancement in the dispersive shift. We investigate the coherence properties in two of these devices, which are in the strong-dispersive regime, and show that the qubit energy relaxation is currently not limited by the coupling. We also observe the discrete ac-Stark effect, a hallmark of the strong-dispersive regime, in accordance with the theory.https://doi.org/10.1088/1367-2630/16/1/015017 |
| spellingShingle | T Yamamoto K Inomata K Koshino P-M Billangeon Y Nakamura J S Tsai Superconducting flux qubit capacitively coupled to an LC resonator New Journal of Physics |
| title | Superconducting flux qubit capacitively coupled to an LC resonator |
| title_full | Superconducting flux qubit capacitively coupled to an LC resonator |
| title_fullStr | Superconducting flux qubit capacitively coupled to an LC resonator |
| title_full_unstemmed | Superconducting flux qubit capacitively coupled to an LC resonator |
| title_short | Superconducting flux qubit capacitively coupled to an LC resonator |
| title_sort | superconducting flux qubit capacitively coupled to an lc resonator |
| url | https://doi.org/10.1088/1367-2630/16/1/015017 |
| work_keys_str_mv | AT tyamamoto superconductingfluxqubitcapacitivelycoupledtoanlcresonator AT kinomata superconductingfluxqubitcapacitivelycoupledtoanlcresonator AT kkoshino superconductingfluxqubitcapacitivelycoupledtoanlcresonator AT pmbillangeon superconductingfluxqubitcapacitivelycoupledtoanlcresonator AT ynakamura superconductingfluxqubitcapacitivelycoupledtoanlcresonator AT jstsai superconductingfluxqubitcapacitivelycoupledtoanlcresonator |