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• 21 January
  [Institut Quantique] séminaire de l’IQ/3iT : Kevin. J. Satzinger
  21 January

  [Institut Quantique] séminaire de l’IQ/3iT : Kevin. J. Satzinger

  Location : P2-1002 (3iT) Description : Title: Quantum control of surface acoustic wave phononsAbstract: One of the hallmarks of quantum physics is the generation of non-classical quantum states and superpositions, which has been demonstrated in several quantum systems, including ions, solid-state qubits, and photons. However, only indirect demonstrations of non-classical states have been achieved in mechanical systems, despite the scientific appeal and technical utility of such a capability, including in quantum sensing, computation and communication applications. In this seminar, we present a surface acoustic wave resonator strongly coupled to a superconducting qubit. We build the acoustic resonator and qubit on separate chips and integrate them with a simple, accessible flip-chip technique. This allows us to achieve good qubit performance and strong, tunable coupling to the acoustic mode. We show ground state cooling of the surface acoustic wave resonator with probability at least 99.5%. Finally, we illustrate quantum superposition in the surface acoustic wave resonator, conducting Wigner tomography of a superposition |0⟩ + |1⟩, finding fidelity 0.945 ± 0.006.K. J. Satzinger et al., Nature 563, 661-665 (2018)Bio: Kevin Satzinger is a research scientist in the Google AI Quantum hardware team in Santa Barbara, California. He recently completed his Ph.D. in physics working with Andrew Cleland at UC Santa Barbara and the University of Chicago.

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• 23 January
  [Séminaires] Séminaire de doctorat : Redha Rouane
  23 January

  [Séminaires] Séminaire de doctorat : Redha Rouane

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• 23 January
  [Institut Quantique] Séminaire : Christina Knapp
  23 January

  [Institut Quantique] Séminaire : Christina Knapp

  Location : D3-2041 Description : Christina Knapp, University of California Santa BarbaraTopological Quantum Computing with Majorana Zero ModesExperiments over the past decade have shown increasingly convincing evidence for the existence of Majorana zero modes (MZMs) at the ends of a topological superconducting wire. Storing quantum information non-locally in the joint state of pairs of MZMs is a promising approach towards topological quantum computing. In this talk, I will discuss a proposal for scalable Majorana-based quantum computing architectures that are both testable in near-term devices and promising for large scale quantum computing [1]. I will first explain the topological protection of these qubits and their operation using a measurement-based protocol. I will then discuss qubit dephasing from finite MZM hybridization [2]. Finally, I will touch on fault tolerance implications of the dominant error sources [3].References: [1] PRB 95 235305 (2017) arXiv:1610.05289 [2] PRB 97 125404 (2018) arXiv:1711.03968 [3] Quantum 2 88 (2018) arXiv: 1806.01275

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