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Strong coupling between a microwave photon and a singlet-triplet qubit

Ungerer, J. H. ; Pally, A. ; Kononov, A. ; Lehmann, S. LU ; Ridderbos, J. ; Potts, P. P. ; Thelander, C. LU ; Dick, K. A. LU ; Maisi, V. F. LU and Scarlino, P. , et al. (2024) In Nature Communications 15(1).
Abstract

Combining superconducting resonators and quantum dots has triggered tremendous progress in quantum information, however, attempts at coupling a resonator to even charge parity spin qubits have resulted only in weak spin-photon coupling. Here, we integrate a zincblende InAs nanowire double quantum dot with strong spin-orbit interaction in a magnetic-field resilient, high-quality resonator. The quantum confinement in the nanowire is achieved using deterministically grown wurtzite tunnel barriers. Our experiments on even charge parity states and at large magnetic fields, allow us to identify the relevant spin states and to measure the spin decoherence rates and spin-photon coupling strengths. We find an anti-crossing between the resonator... (More)

Combining superconducting resonators and quantum dots has triggered tremendous progress in quantum information, however, attempts at coupling a resonator to even charge parity spin qubits have resulted only in weak spin-photon coupling. Here, we integrate a zincblende InAs nanowire double quantum dot with strong spin-orbit interaction in a magnetic-field resilient, high-quality resonator. The quantum confinement in the nanowire is achieved using deterministically grown wurtzite tunnel barriers. Our experiments on even charge parity states and at large magnetic fields, allow us to identify the relevant spin states and to measure the spin decoherence rates and spin-photon coupling strengths. We find an anti-crossing between the resonator mode in the single photon limit and a singlet-triplet qubit with a spin-photon coupling strength of g/2π = 139 ± 4 MHz. This coherent coupling exceeds the resonator decay rate κ/2π = 19.8 ± 0.2 MHz and the qubit dephasing rate γ/2π = 116 ± 7 MHz, putting our system in the strong coupling regime.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
15
issue
1
article number
1068
publisher
Nature Publishing Group
external identifiers
  • pmid:38316779
  • scopus:85187194723
ISSN
2041-1723
DOI
10.1038/s41467-024-45235-w
language
English
LU publication?
yes
id
50a098d1-149b-4d92-b5a5-74fca0b9e567
date added to LUP
2024-03-27 13:30:59
date last changed
2024-04-24 17:32:52
@article{50a098d1-149b-4d92-b5a5-74fca0b9e567,
  abstract     = {{<p>Combining superconducting resonators and quantum dots has triggered tremendous progress in quantum information, however, attempts at coupling a resonator to even charge parity spin qubits have resulted only in weak spin-photon coupling. Here, we integrate a zincblende InAs nanowire double quantum dot with strong spin-orbit interaction in a magnetic-field resilient, high-quality resonator. The quantum confinement in the nanowire is achieved using deterministically grown wurtzite tunnel barriers. Our experiments on even charge parity states and at large magnetic fields, allow us to identify the relevant spin states and to measure the spin decoherence rates and spin-photon coupling strengths. We find an anti-crossing between the resonator mode in the single photon limit and a singlet-triplet qubit with a spin-photon coupling strength of g/2π = 139 ± 4 MHz. This coherent coupling exceeds the resonator decay rate κ/2π = 19.8 ± 0.2 MHz and the qubit dephasing rate γ/2π = 116 ± 7 MHz, putting our system in the strong coupling regime.</p>}},
  author       = {{Ungerer, J. H. and Pally, A. and Kononov, A. and Lehmann, S. and Ridderbos, J. and Potts, P. P. and Thelander, C. and Dick, K. A. and Maisi, V. F. and Scarlino, P. and Baumgartner, A. and Schönenberger, C.}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Strong coupling between a microwave photon and a singlet-triplet qubit}},
  url          = {{http://dx.doi.org/10.1038/s41467-024-45235-w}},
  doi          = {{10.1038/s41467-024-45235-w}},
  volume       = {{15}},
  year         = {{2024}},
}