Strong coupling between a microwave photon and a singlet-triplet qubit
(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.
(Less)
- author
- organization
- publishing date
- 2024-12
- 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}}, }