RQC Colloquium

25th RQC Colloquium

• Speaker

  Prof. Dafei Jin
  (University of Notre Dame)

• Date

  16:00-17:00 (JST), June 17, 2024 (Monday)

• Venue

  Hybrid(Zoom・Wako C61 Welfare and Conference Building, 2F Large Meeting Room)

• Title

  Single electrons on solid neon – a long-coherence high-fidelity qubit platform

• Inquiries

  rqc_colloquium_inquiry[at]ml.riken.jp

• Registration Form

  https://krs2.riken.jp/m/rqc_registration_form

Abstract
In this talk, I will present our discovery and development of a new qubit platform based upon isolated single electrons trapped on an ultraclean solid neon surface in a vacuum [1,2]. Our electron-on-solid-neon (eNe) charge (motional) qubits are controlled and readout by microwave photons in an on-chip superconducting resonator. The measured relaxation and coherence times have both reached the order of 0.1 ms, surpassing all existing charge qubits and rivalling state-of-the-art superconducting transmon qubits. Single-shot readout fidelity without a quantum-limited amplifier has reached 98.1%. Average single-qubit gate fidelity with Clifford-based randomized benchmarking has reached 99.97%. Utilizing a high-kinetic-inductance resonator, our latest results have shown much enhanced electron-photon coupling strength. This paves the way towards strong-dispersive coupling between two qubits and hence realization of two-qubit entangling gates for universal quantum computing.

[1] X. Zhou et al., “Single electrons on solid neon as a solid-state qubit platform”, Nature 605, 46–50 (2022).
[2] X. Zhou et al., “Electron charge qubits with 0.1 millisecond coherence time”, Nature Physics 20, 116–122 (2024).

Flyer: 25th RQC Colloquium Flyer