Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact
Vivek Chidambaram, Anders Kringhøj, Lucas Casparis, Ferdinand Kuemmeth, Tiantian Wang, Candice Thomas, Sergei Gronin, Geoffrey C. Gardner, Zhengyi Cui, Chenlu Liu, Kristof Moors, Michael J. Manfra, Karl D. Petersson, Malcolm R. Connolly
DOI 10.1103/PhysRevResearch.4.023170 · Physical Review Research
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We use a superconducting microresonator as a cavity to sense absorption of microwaves by a superconducting quantum point contact defined by surface gates over a proximitized two-dimensional electron gas. Renormalization of the cavity frequency with phase difference across the point contact is consistent with coupling to Andreev bound states. Near π phase difference, we observe random fluctuations in absorption with gate voltage, related to quantum interference-induced modulations in the electron transmission. Close to pinch-off, we identify features consistent with the presence of a single Andreev bound state and describe the Andreev-cavity interaction using a Jaynes-Cummings model. By fitting the weak Andreev-cavity coupling, we extract ∼GHz decoherence consistent with charge noise and the transmission dispersion associated with a localized state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbTiN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Microwave Sensing of Andreev Bound States in a Gate-Defined Superconducting Quantum Point Contact
similarity 1.00Vivek Chidambaram et al. · 2021 · arXiv:2102.05206
Source status unknown — claims are unverified
Conductance quantization and Andreev reflection in narrow ferromagnet/superconductor point contacts
similarity 0.97K. Kikuchi et al.
Source status unknown — claims are unverified
Spectrum of Andreev Bound States in a Molecule Embedded Inside a Microwave-Excited Superconducting Junction
similarity 0.96Jonas Sköldberg et al.
Source status unknown — claims are unverified
Controlled dephasing of Andreev states in superconducting quantum point contacts
similarity 0.96M. A. Despósito & A. Levy Yeyati
Source status unknown — claims are unverified
Direct Microwave Measurement of Andreev-Bound-State Dynamics in a Semiconductor-Nanowire Josephson Junction
similarity 0.96M. Hays et al.
Source status unknown — claims are unverified
Microwave Quantum Link between Superconducting Circuits Housed in Spatially Separated Cryogenic Systems
similarity 0.96P. Magnard et al.
Source status unknown — claims are unverified