Reversing Hydrogen-Related Loss in α-Ta Thin Films for Quantum Device Fabrication

  1. D. P. Lozano,
  2. M. Mongillo,
  3. B. Raes,
  4. Y. Canvel,
  5. S. Massar,
  6. A. M. Vadiraj,
  7. Ts. Ivanov,
  8. R. Acharya,
  9. J. Van Damme,
  10. J. Van de Vondel,
  11. D. Wan,
  12. A. Potocnik,
  13. and K. De Greve
α-Tantalum (α-Ta) is an emerging material for superconducting qubit fabrication due to the low microwave loss of its stable native oxide. However, hydrogen absorption during fabrication,

Argon milling induced decoherence mechanisms in superconducting quantum circuits

  1. J. Van Damme,
  2. Ts. Ivanov,
  3. P. Favia,
  4. T. Conard,
  5. J. Verjauw,
  6. R. Acharya,
  7. D. Perez Lozano,
  8. B. Raes,
  9. J. Van de Vondel,
  10. A. M. Vadiraj,
  11. M. Mongillo,
  12. D. Wan,
  13. J. De Boeck,
  14. A. Potočnik,
  15. and K. De Greve
The fabrication of superconducting circuits requires multiple deposition, etch and cleaning steps, each possibly introducing material property changes and microscopic defects. In this

Path toward manufacturable superconducting qubits with relaxation times exceeding 0.1 ms

  1. J. Verjauw,
  2. R. Acharya,
  3. J. Van Damme,
  4. Ts. Ivanov,
  5. D. Perez Lozano,
  6. F. A. Mohiyaddin,
  7. D. Wan,
  8. J. Jussot,
  9. A. M. Vadiraj,
  10. M. Mongillo,
  11. M. Heyns,
  12. I. Radu,
  13. B. Govoreanu,
  14. and A. Potočnik
As the superconducting qubit platform matures towards ever-larger scales in the race towards a practical quantum computer, limitations due to qubit inhomogeneity through lack of process

Engineering the Level Structure of a Giant Artificial Atom in Waveguide Quantum Electrodynamics

  1. A. M. Vadiraj,
  2. Andreas Ask,
  3. T.G. McConkey,
  4. I. Nsanzineza,
  5. C.W. Sandbo Chang,
  6. Anton Frisk Kockum,
  7. and C. M. Wilson
Engineering light-matter interactions at the quantum level has been central to the pursuit of quantum optics for decades. Traditionally, this has been done by coupling emitters, typically

Observation of Three-Photon Spontaneous Parametric Downconversion in a Superconducting Parametric Cavity

  1. C.W. Sandbo Chang,
  2. Carlos Sabín,
  3. P. Forn-Díaz,
  4. Fernando Quijandría,
  5. A. M. Vadiraj,
  6. I. Nsanzineza,
  7. G. Johansson,
  8. and C.M. Wilson
Spontaneous parametric downconversion (SPDC) has been a key enabling technology in exploring quantum phenomena and their applications for decades. For instance, traditional SPDC, which

Generating Multimode Entangled Microwaves with a Superconducting Parametric Cavity

  1. C.W. Sandbo Chang,
  2. M. Simoen,
  3. José Aumentado,
  4. Carlos Sabín,
  5. P. Forn-Díaz,
  6. A. M. Vadiraj,
  7. Fernando Quijandría,
  8. G. Johansson,
  9. I. Fuentes,
  10. and C.M. Wilson
In this Letter, we demonstrate the generation of multimode entangled states of propagating microwaves. The entangled states are generated by parametrically pumping a multimode superconducting

Shaped, on-demand microwave single-photon generator

  1. P. Forn-Díaz,
  2. C. W. Warren,
  3. C. W. S. Chang,
  4. A. M. Vadiraj,
  5. and C. M. Wilson
We demonstrate the full functionality of a circuit that generates single microwave photons on-demand, with a wavepacket that can be modulated with a near-arbitrary shape. We achieve