Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact

Research output: Contribution to journal › Journal article › Research › peer-review

Standard

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.

In: Physical Review Research, Vol. 4, No. 2, 023170, 31.05.2022.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Chidambaram, V, Kringhoj, A, Casparis, L, Kuemmeth, F, Wang, T, Thomas, C, Gronin, S, Gardner, GC, Cui, Z, Liu, C, Moors, K, Manfra, MJ, Petersson, KD & Connolly, MR 2022, 'Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact', Physical Review Research, vol. 4, no. 2, 023170. https://doi.org/10.1103/PhysRevResearch.4.023170

APA

Chidambaram, V., Kringhoj, A., Casparis, L., Kuemmeth, F., Wang, T., Thomas, C., Gronin, S., Gardner, G. C., Cui, Z., Liu, C., Moors, K., Manfra, M. J., Petersson, K. D., & Connolly, M. R. (2022). Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact. Physical Review Research, 4(2), [023170]. https://doi.org/10.1103/PhysRevResearch.4.023170

Vancouver

Chidambaram V, Kringhoj A, Casparis L, Kuemmeth F, Wang T, Thomas C et al. Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact. Physical Review Research. 2022 May 31;4(2). 023170. https://doi.org/10.1103/PhysRevResearch.4.023170

Author

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. / Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact. In: Physical Review Research. 2022 ; Vol. 4, No. 2.

Bibtex

@article{b6ac8030ebd64d1f8336034eb8ff03d7,
title = "Microwave sensing of Andreev bound states in a gate-defined superconducting quantum point contact",
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 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.",
keywords = "SUPERCURRENT, QUBIT",
author = "Vivek Chidambaram and Anders Kringhoj and Lucas Casparis and Ferdinand Kuemmeth and Tiantian Wang and Candice Thomas and Sergei Gronin and Gardner, {Geoffrey C.} and Zhengyi Cui and Chenlu Liu and Kristof Moors and Manfra, {Michael J.} and Petersson, {Karl D.} and Connolly, {Malcolm R.}",
year = "2022",
month = may,
day = "31",
doi = "10.1103/PhysRevResearch.4.023170",
language = "English",
volume = "4",
journal = "Physical Review Research",
issn = "2643-1564",
publisher = "AMER PHYSICAL SOC",
number = "2",

}

RIS

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