RQC Seminar

306th RQC Seminar

• Speaker

  Dr. Oleg Mukhanov
  ( CSO, Co-Founder, SEEQC )

• Date

  13:30-14:30, (1:30 p.m.-2:30 p.m.) Thursday, October 22, 2026

• Venue

  Hybrid(Zoom, Wako Coop. Center 3F W319-321 Meeting Room/研究交流棟3階 会議室(W319-321)）

• Title

  Opportunities and Challenges for Superconducting Control of Quantum Computers

• Inquiries

  eisuke.abe[at]riken.jp

Abstract
The integration of cryogenic digital control and readout close to the qubits chips in the same cryostat has the potential to solve the major roadblocks in scaling quantum computers to the complexity levels necessary for practical applications. This would avoid the challenges of generating qubit control and readout signals at room-temperature and transmitting them with minimum distortions, crosstalk, noise, heat load over long coaxial cables. The current implementation of qubit control, including 1Q and 2Q gates, readout functions using energy-efficient superconducting digital circuits will be reviewed. The insertion of the superconducting electronics co-integrated with qubit chips eliminated many problems listed above. However, the fidelity and speed of the digitally controlled quantum gates are lagging below the performance of conventional microwave techniques. The performance improvement can come with further sophistication of superconducting circuits which can be prohibitive in terms of energy cost and complexity. The performance/power/complexity tradeoffs will be discussed. In addition, one needs to address specific to superconducting circuits problems such as potential quasiparticle poisoning of qubits, flux trapping, poor scaling of operational margins, fabrication yield, and lack of dense memories. Possible ways to address these challenges will be reviewed.