In this section
@article{Connolly:2022:10.1103/PhysRevResearch.4.023170,
author = {Connolly, M},
doi = {10.1103/PhysRevResearch.4.023170},
journal = {Physical Review Research},
pages = {1--9},
title = {Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact},
url = {http://dx.doi.org/10.1103/PhysRevResearch.4.023170},
volume = {4},
year = {2022}
}
TY - JOUR
AB - We use a superconducting microresonator as a cavity to sense absorption of microwaves by asuperconducting quantum point contact defined by surface gates over a proximitized two-dimensionalelectron gas. Renormalization of the cavity frequency with phase difference across the point contact isconsistent with coupling to Andreev bound states. Near π phase difference, we observe randomfluctuations in absorption with gate voltage, related to quantum interference-induced modulations in theelectron transmission. Close to pinch-off, we identify features consistent with the presence of a singleAndreev bound state and describe the Andreev-cavity interaction using a dispersive Jaynes-Cummingsmodel. By fitting the weak Andreev-cavity coupling, we extract ~GHz decoherence consistent with chargenoise and the transmission dispersion associated with a localized state.
AU - Connolly,M
DO - 10.1103/PhysRevResearch.4.023170
EP - 9
PY - 2022///
SN - 2643-1564
SP - 1
TI - Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact
T2 - Physical Review Research
UR - http://dx.doi.org/10.1103/PhysRevResearch.4.023170
UR - https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.4.023170
UR - http://hdl.handle.net/10044/1/95391
VL - 4
ER -