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• 28 septembre
  [Institut Quantique] MatQ
  28 septembre

  [Institut Quantique] MatQ

  Lieu : Auditorium IQ Description :

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• 28 septembre
  [Institut Quantique] MatQ – Groupe Taillefer et Quilliam
  28 septembre

  [Institut Quantique] MatQ – Groupe Taillefer et Quilliam

  Lieu : Description : LK-99: a room-temperature ambient-pressure superconductor or NOT? In this seminar, I will tell the story about the newly alleged room-temperatureambient-pressure superconductor LK-99. Start with a very brief introduction onsome background knowledge about superconductors. Then I’ll talk about how LK-99was discovered and all the follow-up checkups done by other groups. Many groupshave tried to repeat the study on LK-99, while in the meantime, multiplequestions were raised regarding whether LK-99 is a real superconductor or not.I’ll lead the audience through the pathway of how science sleuths solved themystery of LK-99.- Par Lu Chen -Étude etdétection de magnons parcouplage photon-magnon dans le matériau 2D le CrCl3Dans ce MatQ, je vais vous présenter une introduction de monprojet de recherche. Il consiste à générer et à observer des interactions photon-magnonà l’aide d'un résonateur planaire supraconducteur dans le but de sonder et d’étudierles magnons dans le matériau magnétique 2D le CrCl3.- Par Julien Pothier-Leboeuf - 

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• 28 septembre
  [Institut Quantique] Séminaire – François Swiadek
  28 septembre

  [Institut Quantique] Séminaire – François Swiadek

  Lieu : Auditorium de l'IQ Description : ETH ZurichInvité du Pr Alexandre BlaisTitle: "Enhancing Dispersive Readout of SuperconductingQubits Through Dynamic Control of the Dispersive Shift: Experiment andTheory"Abstract: "The performance of a wide range ofquantum computing algorithms and protocols depends critically on the fidelityand speed of the employed qubit readout. Examples include gate sequencesbenefiting from mid-circuit, real-time, measurement-based feedback, such asqubit initialization, entanglement generation, teleportation, and perhaps mostimportantly, quantum error correction. A prominent and widely-used readoutapproach is based on the dispersive interaction of a superconducting qubitstrongly coupled to a large-bandwidth readout resonator, frequently combinedwith a dedicated or shared Purcell filter protecting qubits from decay. Bydynamically reducing the qubit-resonator detuning and thus increasing thedispersive shift, we demonstrate a beyond-state-of-the-art two-state-readouterror of only 0.25% in 100 ns integration time. Maintaining low readout-drive strength,we nearly quadruple the signal-to-noise ratio of the readout by doubling thereadout mode linewidth, which we quantify by considering the hybridization ofthe readout-resonator and its dedicated Purcell-filter. We find excellentagreement between our experimental data and our theoretical model. Thepresented results are expected to further boost the performance of new andexisting algorithms and protocols critically depending on high-fidelity, fast,mid-circuit measurements."

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