Quantum control of a cat-qubit with bit-flip times exceeding ten seconds - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Preprints, Working Papers, ... Year : 2023

Quantum control of a cat-qubit with bit-flip times exceeding ten seconds

Emanuele Albertinale
  • Function : Author
Natalia Pankratova
  • Function : Author
Mattis Hallén
  • Function : Author
Felix Rautschke
  • Function : Author
Alain Sarlette
Raphaël Lescanne
  • Function : Author
Sébastien Jezouin
  • Function : Author

Abstract

Binary classical information is routinely encoded in the two metastable states of a dynamical system. Since these states may exhibit macroscopic lifetimes, the encoded information inherits a strong protection against bit-flips. A recent qubit - the cat-qubit - is encoded in the manifold of metastable states of a quantum dynamical system, thereby acquiring bit-flip protection. An outstanding challenge is to gain quantum control over such a system without breaking its protection. If this challenge is met, significant shortcuts in hardware overhead are forecast for quantum computing. In this 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, and six orders of magnitude enhancement over the single photon lifetime that compose this dynamical qubit. This was achieved by introducing a quantum tomography protocol that does not break bit-flip protection. We prepare and image quantum superposition states, and measure phase-flip times above 490 nanoseconds. Most importantly, we control the phase of these superpositions while maintaining the bit-flip time above ten seconds. This work demonstrates quantum operations that preserve macroscopic bit-flip times, a necessary step to scale these dynamical qubits into fully protected hardware-efficient architectures.

Dates and versions

hal-04189479 , version 1 (28-08-2023)

Licence

Identifiers

Cite

Ulysse Réglade, Adrien Bocquet, Ronan Gautier, Antoine Marquet, Emanuele Albertinale, et al.. Quantum control of a cat-qubit with bit-flip times exceeding ten seconds. 2023. ⟨hal-04189479⟩
47 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More