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Near-unity charge readout signal in a nonlinear resonator without matching the sensor dissipation

Havir, Harald LU ; Cicovic, Andrea LU ; Glidic, Pierre LU ; Haldar, Subhomoy LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU and Maisi, Ville F. LU (2026) In Nature Communications 17(1).
Abstract

Dissipative sensors typically use linear resonators with impedance matching to achieve maximal signal and fast operation. The impedance matching, however, sets an upper limit to the bandwidth of the readout. In this paper, we present a nonlinear resonator performing the readout of a double quantum dot charge state via a charge-sensing quantum dot. We show that by driving the resonator in the nonlinear regime, we achieve a near-unity signal for a dissipative sensor. This despite not satisfying the sensor impedance matching requirements necessary for such large signals in the linear regime. Our experiments, supported by numerical calculations, demonstrate that the signal increase stems from the sensor dissipation shifting the onset of the... (More)

Dissipative sensors typically use linear resonators with impedance matching to achieve maximal signal and fast operation. The impedance matching, however, sets an upper limit to the bandwidth of the readout. In this paper, we present a nonlinear resonator performing the readout of a double quantum dot charge state via a charge-sensing quantum dot. We show that by driving the resonator in the nonlinear regime, we achieve a near-unity signal for a dissipative sensor. This despite not satisfying the sensor impedance matching requirements necessary for such large signals in the linear regime. Our experiments, supported by numerical calculations, demonstrate that the signal increase stems from the sensor dissipation shifting the onset of the nonlinear resonator response. By lifting the matching requirement, we open up an avenue to ultra-fast charge detectors as the resonator input-output coupling - setting the detector bandwidth - does not have to match to the typically much slower sensor dissipation rate.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
17
issue
1
article number
5781
publisher
Nature Publishing Group
external identifiers
  • pmid:42393088
  • scopus:105043857404
ISSN
2041-1723
DOI
10.1038/s41467-026-75082-w
language
English
LU publication?
yes
id
5c002643-7b37-4c6b-98a8-22f3e4a4d3f7
date added to LUP
2026-09-03 16:14:39
date last changed
2026-09-17 17:01:18
@article{5c002643-7b37-4c6b-98a8-22f3e4a4d3f7,
  abstract     = {{<p>Dissipative sensors typically use linear resonators with impedance matching to achieve maximal signal and fast operation. The impedance matching, however, sets an upper limit to the bandwidth of the readout. In this paper, we present a nonlinear resonator performing the readout of a double quantum dot charge state via a charge-sensing quantum dot. We show that by driving the resonator in the nonlinear regime, we achieve a near-unity signal for a dissipative sensor. This despite not satisfying the sensor impedance matching requirements necessary for such large signals in the linear regime. Our experiments, supported by numerical calculations, demonstrate that the signal increase stems from the sensor dissipation shifting the onset of the nonlinear resonator response. By lifting the matching requirement, we open up an avenue to ultra-fast charge detectors as the resonator input-output coupling - setting the detector bandwidth - does not have to match to the typically much slower sensor dissipation rate.</p>}},
  author       = {{Havir, Harald and Cicovic, Andrea and Glidic, Pierre and Haldar, Subhomoy and Lehmann, Sebastian and Dick, Kimberly A. and Maisi, Ville F.}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Near-unity charge readout signal in a nonlinear resonator without matching the sensor dissipation}},
  url          = {{http://dx.doi.org/10.1038/s41467-026-75082-w}},
  doi          = {{10.1038/s41467-026-75082-w}},
  volume       = {{17}},
  year         = {{2026}},
}