Pau Dietz Romero - DR Project
Doctoral Researcher: Pau Dietz Romero
Local Supervisor: Lammert Duipmans
Academic Supervisor: Lotte Geck, RWTH Aachen / ICA
Topic: Quantum Computing
Research Field: Information
Co-Simulation of Control Electronics and Qubits
Quantum processors with a sufficient number and fidelity of qubits can speed up certain mathematical algorithms by choreographing a pattern of interference between the observable states of information represented in entangled qubits that are in a non-classical superposition state.
Since scaling quantum processors requires large-scale integration of qubit control electronics at cryogenic temperatures close to the qubits, our research institute is designing integrated circuits using state-of-the-art CMOS technology to control and read out spin qubits implemented as quantum dots in semiconductor heterostructures (Si and SiGe). Building an efficient electronic system requires tight specifications and smart budgeting of resources (e.g. heat dissipation, area, electronic noise, signal discretization). Accurate specification requires a clear understanding of the interfaces between the qubit domain, optimal signal control and IC design.
My research aims to implement a co-simulation framework that provides IC designers with tools and a methodology for designing qubit electronics. It is intended to assist IC designers in making design decisions that balance trade-offs across the domains involved in order to optimize the system as a whole. The co-simulation framework should, on the one hand, verify existing electronic designs, but on the other hand also enable the exploration of the design space to find new designs that better utilize existing resources to achieve higher qubit numbers while maintaining error correction thresholds. With the help of such a tool, we envisage to compare different electronic architectures and interconnection schemes of electronic functional blocks. In addition, the co-simulation should represent a system model which serves as a "living" reference for experts of different domains instead of using only static documents. The ultimate vision is to eventually share a framework with the scientific community and apply it to qubit embodiments other than electron spin in quantum dots.
The efficient integration of the electronic system is crucial because the resources inside our quantum computer (e.g. coherence time, noise tolerance, electronic area, cooling power) will remain extremely valuable in the years to come.
This work carries on the research of our colleague L. Duipmans on the co-simulation of the electronics generating the shuttle signal for the SPINBUS architecture [1]. First co-simulations for integrated qubit electronics for spin qubits have already been investigated by [2] and [3].
References
[1] M. Künne et al., "The SpinBus architecture for scaling spin qubits with electron shuttling". Nature Communications, 2024
[2] J.P.G. van. Dijk, "Designing the Electronic Interface for Qubit Control". Delft University of Technology, 2021.
[3] B. Gys et al., "A Co-Simulation Methodology for the Design of Integrated Silicon Spin Qubits With Their Control/Readout Cryo-CMOS Electronics". IEEE Journal on Emerging and Selected Topics in Circuits and Systems, 2022
Pau Dietz Romero
Doctoral Researcher
- Peter Grünberg Institute (PGI)
- Integrated Computing Architectures (PGI-4)
Room 214