Calibration of the cross-resonance two-qubit gate between directly-coupled transmons

  1. A. D. Patterson,
  2. J. Rahamim,
  3. T. Tsunoda,
  4. P. Spring,
  5. S. Jebari,
  6. K. Ratter,
  7. M. Mergenthaler,
  8. G. Tancredi,
  9. B. Vlastakis,
  10. M. Esposito,
  11. and P. J. Leek
Quantum computation requires the precise control of the evolution of a quantum system, typically through application of discrete quantum logic gates on a set of qubits. Here, we use

A self-aligned nano-fabrication process for vertical NbN-MgO-NbN Josephson junctions

  1. A. Grimm,
  2. S. Jebari,
  3. D. Hazra,
  4. F. Blanchet,
  5. F. Gustavo,
  6. J.-L. Thomassin,
  7. and M. Hofheinz
We present a new process for fabricating vertical NbN-MgO-NbN Josephson junctions using self-aligned silicon nitride spacers. It allows for a wide range of junction areas from 0.02

Quantum limited amplification from inelastic Cooper pair tunneling

  1. S. Jebari,
  2. F. Blanchet,
  3. A. Grimm,
  4. D. Hazra,
  5. R. Albert,
  6. P. Joyez,
  7. D. Vion,
  8. D. Esteve,
  9. F. Portier,
  10. and M. Hofheinz
Nature sets fundamental limits regarding how accurate the amplification of analog signals may be. For instance, a linear amplifier unavoidably adds some noise which amounts to half

Superconducting properties of very high quality NbN thin films grown by high temperature chemical vapor deposition

  1. D. Hazra,
  2. N. Tsavdaris,
  3. S. Jebari,
  4. A. Grimm,
  5. F. Blanchet,
  6. F. Mercier,
  7. E. Blanquet,
  8. C. Chapelier,
  9. and M. Hofheinz
Niobium nitride (NbN) is widely used in high-frequency superconducting electronics circuits because it has one of the highest superconducting transition temperatures (Tc ∼ 16.5 K)