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• 20 février
  [Institut Quantique] Séminaire de l’IQ (à préciser)
  20 février

  [Institut Quantique] Séminaire de l’IQ (à préciser)

  Lieu : Description :

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• 20 février
  [Séminaires] séminaire de l’IQ: Laurens Vanderstraeten
  20 février

  [Séminaires] séminaire de l’IQ: Laurens Vanderstraeten

  Lieu : D3-2041 Description : Laurens Vanderstraeten Department of Physics and Astronomy University of GhentTitre: Simulating Quantum Matter with Tensor NetworksRésumé: In the last decade, tensor networks have emerged as a natural language for describing many-body systems with strong correlations. In this talk, I will show how this new language allows for the efficient simulation of ground-state properties of one- and two-dimensional quantum spin systems. I will also explain that quasiparticles arise naturally out of this formalism, providing a window into the low-energy dynamics of these systems. I conclude with an outlook on the future challenges in capturing exotic quantum phenomena with tensor networks.

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• 21 février
  [Séminaires] séminaire de l’IQ : Joachim Cohen
  21 février

  [Séminaires] séminaire de l’IQ : Joachim Cohen

  Lieu : D3-2041 Description : Joachim Cohen, QUANTIC project-team, INRIA Paris, FranceTitre: Fault-tolerant quantum error correction with cat qubitsRésumé:In a quantum error correction (QEC) scheme, the measurement of an error syndrome should be performed in a quantum non-demolition manner. In particular, such a measurement should not introduce additional error channels which are not correctable by the QEC scheme. Here, we ensure such a robustness by designing a specific interaction between the data qubits and the readout modes that preserves the degeneracy of the measured observable. Such a coupling makes the system tolerant to possible errors occurring on the readout modes. More precisely, we propose to perform quantum non-demolition measurement of photon-number parity in a microwave cavity. This corresponds to the error syndrome in a class of error correcting codes called the cat codes, which have recently proven to be efficient and versatile for quantum information processing. In our design, we exploit the strongly nonlinear Hamiltonian of a high-impedance Josephson circuit, coupling a high-Q cavity mode to a low-Q readout one. Next, as a follow up of this result, we present a continuous and autonomous fault-tolerant QEC scheme using the cat code. This scheme provides a robust protection against dominant error channels in the presence of multi-photon driven dissipation.

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