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Q47: Superconducting Kerr Cats


Sponsoring Units: DQIChair: Ronan Gautier, Alice & BobSession Tags:
  • Focus

Wed. March 6, 3:36 p.m. – 3:48 p.m. CST


Quantum bits (qubits) that are inherently protected against certain types of errors are promising candidates for scalable quantum computing. An outstanding challenge is to control such a qubit without breaking its protection. A recent qubit - the cat-qubit - is encoded in the manifold of metastable states of a quantum dynamical system, thereby acquiring continuous and autonomous protection against bit-flips. In this superconducting circuit experiment, we implement a cat-qubit with bit-flip times exceeding ten seconds. This is a four order of magnitude improvement over previous cat-qubit implementations. We prepare and image quantum superposition states, and measure phase-flip times above 490 nanoseconds. Most importantly, we control the phase of these quantum superpositions without breaking bit-flip protection. This work demonstrates quantum operations that preserve bit-flip times above ten seconds, a necessary step to scale these dynamical qubits into fully protected hardware-efficient architectures.

Preprint : arxiv:2307.06617

Presented By

  • Adrien Bocquet (ALICE & BOB)


  • Adrien Bocquet (ALICE & BOB)
  • Zaki Leghtas (Mines ParisTech)
  • Ulysse Reglade (Alice&Bob-LPENS)
  • Ronan Gautier (Inria Paris)
  • Joachim Cohen (Universite de Sherbrooke)
  • Antoine Marquet (Ecole Normale Supérieure de Lyon / ALICE & BOB - University)
  • Emanuele Albertinale (CEA-Saclay)
  • Natalia Pankratova (University of Maryland, College Park)
  • Mattis O Hallén (Alice&Bob)
  • Felix Rautschke (Alice&Bob)
  • Lev-Arcady Sellem (INRIA)
  • Pierre Rouchon (Mines Paris)
  • Alain Sarlette (INRIA)
  • Mazyar Mirrahimi (INRIA)
  • Phillipe Campagne-Ibarcq (Ecole Normale Superieure)
  • Raphael Lescanne (ALICE & BOB)
  • Sebastien Jezouin (ALICE & BOB)