Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact. / Chidambaram, Vivek; Kringhoj, Anders; Casparis, Lucas; Kuemmeth, Ferdinand; Wang, Tiantian; Thomas, Candice; Gronin, Sergei; Gardner, Geoffrey C.; Cui, Zhengyi; Liu, Chenlu; Moors, Kristof; Manfra, Michael J.; Petersson, Karl D.; Connolly, Malcolm R.
I: Physical Review Research, Bind 4, Nr. 2, 023170, 31.05.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact
AU - Chidambaram, Vivek
AU - Kringhoj, Anders
AU - Casparis, Lucas
AU - Kuemmeth, Ferdinand
AU - Wang, Tiantian
AU - Thomas, Candice
AU - Gronin, Sergei
AU - Gardner, Geoffrey C.
AU - Cui, Zhengyi
AU - Liu, Chenlu
AU - Moors, Kristof
AU - Manfra, Michael J.
AU - Petersson, Karl D.
AU - Connolly, Malcolm R.
PY - 2022/5/31
Y1 - 2022/5/31
N2 - 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 pi 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 similar to GHz decoherence consistent with charge noise and the transmission dispersion associated with a localized state.
AB - 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 pi 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 similar to GHz decoherence consistent with charge noise and the transmission dispersion associated with a localized state.
KW - SUPERCURRENT
KW - QUBIT
U2 - 10.1103/PhysRevResearch.4.023170
DO - 10.1103/PhysRevResearch.4.023170
M3 - Journal article
VL - 4
JO - Physical Review Research
JF - Physical Review Research
SN - 2643-1564
IS - 2
M1 - 023170
ER -
ID: 315473639