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Decoherence in a crystal-phase defined double quantum dot charge qubit strongly coupled to a high-impedance resonator

Ranni, Antti LU ; Haldar, Subhomoy LU ; Havir, Harald LU ; Lehmann, Sebastian LU ; Scarlino, Pasquale ; Baumgartner, Andreas ; Schönenberger, Christian ; Thelander, Claes LU ; Dick, Kimberly A. LU and Potts, Patrick P. , et al. (2024) In Physical Review Research 6(4).
Abstract

Decoherence of a charge qubit is usually credited to charge noise in the environment. Here we show that charge noise may not be the limiting factor for the qubit coherence. To this end, we study coherence properties of a crystal-phase defined semiconductor nanowire double quantum dot (DQD) charge qubit strongly coupled to a high-impedance resonator using radio-frequency reflectometry. Response of this hybrid system is measured both at a charge noise sensitive operation point (with finite DQD detuning) and at an insensitive point (so-called sweet spot with zero detuning). A theoretical model based on the Jaynes-Cummings Hamiltonian matches the experimental results well and yields only a 10% difference in decoherence rates between the two... (More)

Decoherence of a charge qubit is usually credited to charge noise in the environment. Here we show that charge noise may not be the limiting factor for the qubit coherence. To this end, we study coherence properties of a crystal-phase defined semiconductor nanowire double quantum dot (DQD) charge qubit strongly coupled to a high-impedance resonator using radio-frequency reflectometry. Response of this hybrid system is measured both at a charge noise sensitive operation point (with finite DQD detuning) and at an insensitive point (so-called sweet spot with zero detuning). A theoretical model based on the Jaynes-Cummings Hamiltonian matches the experimental results well and yields only a 10% difference in decoherence rates between the two cases, despite that the sensitivity to detuning charge noise differs by a factor of 5. Therefore, the charge noise is not limiting the coherence in this experiment with this type of semiconducting nanowire qubits.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Research
volume
6
issue
4
article number
043134
publisher
American Physical Society
external identifiers
  • scopus:85210271489
ISSN
2643-1564
DOI
10.1103/PhysRevResearch.6.043134
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2024 authors. Published by the American Physical Society.
id
2b923d95-7063-444d-9004-2ae30a875327
date added to LUP
2025-01-15 11:10:19
date last changed
2025-04-04 15:08:57
@article{2b923d95-7063-444d-9004-2ae30a875327,
  abstract     = {{<p>Decoherence of a charge qubit is usually credited to charge noise in the environment. Here we show that charge noise may not be the limiting factor for the qubit coherence. To this end, we study coherence properties of a crystal-phase defined semiconductor nanowire double quantum dot (DQD) charge qubit strongly coupled to a high-impedance resonator using radio-frequency reflectometry. Response of this hybrid system is measured both at a charge noise sensitive operation point (with finite DQD detuning) and at an insensitive point (so-called sweet spot with zero detuning). A theoretical model based on the Jaynes-Cummings Hamiltonian matches the experimental results well and yields only a 10% difference in decoherence rates between the two cases, despite that the sensitivity to detuning charge noise differs by a factor of 5. Therefore, the charge noise is not limiting the coherence in this experiment with this type of semiconducting nanowire qubits.</p>}},
  author       = {{Ranni, Antti and Haldar, Subhomoy and Havir, Harald and Lehmann, Sebastian and Scarlino, Pasquale and Baumgartner, Andreas and Schönenberger, Christian and Thelander, Claes and Dick, Kimberly A. and Potts, Patrick P. and Maisi, Ville F.}},
  issn         = {{2643-1564}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Research}},
  title        = {{Decoherence in a crystal-phase defined double quantum dot charge qubit strongly coupled to a high-impedance resonator}},
  url          = {{http://dx.doi.org/10.1103/PhysRevResearch.6.043134}},
  doi          = {{10.1103/PhysRevResearch.6.043134}},
  volume       = {{6}},
  year         = {{2024}},
}