---
res:
  bibo_abstract:
  - "State-of-the-art quantum computers, with roughly a thousand qubits, face a crucial
    technological challenge of scaling up. Spins confined in quantum dots (QDs) are
    a promising candidate\r\nfor qubits due to their long coherence, tunability, control,
    and readout. However, their natural\r\ncoupling is the short-ranged (∼ 100 nm)
    exchange interaction, limited to nearest neighbours.\r\nLong-ranged (∼ 1 mm) qubit
    interactions mediated by a photon could be engineered through a\r\ncoherent spin-photon
    coupling. Achieving a strong coupling to a photon is inherently challenging in
    QDs due to the small dipole moment of the confined charge. However, the potential
    of\r\nhigh-impedance resonators to compensate for this has gained significant
    attention in the past\r\ndecade. Nevertheless, previous QD circuit quantum electrodynamics
    implementations have not\r\nexceeded the impedance of ∼ 3.8 kΩ, leaving opportunities
    for significant improvement. The\r\nlarge kinetic inductance of granular aluminium
    (grAl) could provide an order-of-magnitude\r\nenhancement. However, fully exploiting
    the potential of disordered or granular superconductors\r\nis challenging as their
    impedances close to the superconductor-to-insulator transition are\r\ndifficult
    to control reproducibly. We report on the realization of a wireless ohmmeter which\r\nallows
    in situ resistance measurements during film deposition and, therefore, indirect
    control\r\nof the kinetic inductance of grAl films. This allows us to reproducibly
    fabricate resonators\r\nwith characteristic impedance exceeding the resistance
    quantum, even reaching 22.3 kW, due\r\nto the large sheet kinetic inductance of
    up to 3 nH □−1\r\n. By integrating an 8 kW resonator\r\nwith a germanium double
    QD, we demonstrate a strong charge-photon coupling with the\r\nhighest rate reported,
    566 MHz. The demonstrated method and grAl properties make these\r\nresonators
    suitable for boosting the spin-photon coupling strength, a crucial requirement
    for\r\nfast, high-fidelity, long-distance two-qubit gates.\r\n@eng"
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Marian
      foaf_name: Janik, Marian
      foaf_surname: Janik
      foaf_workInfoHomepage: http://www.librecat.org/personId=396A1950-F248-11E8-B48F-1D18A9856A87
    orcid: 0009-0003-9037-8831
  bibo_doi: 10.15479/at:ista:18129
  dct_date: 2024^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2663-337X
  dct_language: eng
  dct_publisher: Institute of Science and Technology Austria@
  dct_title: Strong charge-photon coupling in Germanium enabled by granular aluminium
    superinductors@
...