Integration and Resource Estimation of Cryoelectronics for Superconducting Fault-Tolerant Quantum Computers

TL;DR

This paper reviews the integration of cryoelectronics in superconducting fault-tolerant quantum computers, emphasizing the importance of cryogenic control electronics and resource estimation for scalable quantum architectures.

Contribution

It provides a comprehensive survey of cryogenic approaches and introduces a framework for resource estimation in cryoelectronic integration for quantum computing.

Findings

Cryogenic electronics are essential for scalable FTQCs.

Resource estimation highlights constraints on multiplexing and power at cryogenic stages.

Partitioning between room-temperature and cryogenic electronics impacts system design.

Abstract

Scaling superconducting quantum computers to the fault-tolerant regime calls for a commensurate scaling of the classical control and readout stack. Today's systems largely rely on room-temperature, rack-based instrumentation connected to dilution-refrigerator cryostats through many coaxial cables. Looking ahead, superconducting fault-tolerant quantum computers (FTQCs) will likely adopt a heterogeneous quantum-classical architecture that places selected electronics at cryogenic stages -- for example, cryo-CMOS at 4~K and superconducting digital logic at 4~K and/or mK stages -- to curb wiring and thermal-load overheads. This review distills key requirements, surveys representative room-temperature and cryogenic approaches, and provides a transparent first-order accounting framework for cryoelectronics. Using an RSA-2048-scale benchmark as a concrete reference point, we illustrate how scaling targets motivate constraints on multiplexing and stage-wise cryogenic power, and discuss implications for functional partitioning across room-temperature electronics, cryo-CMOS, and superconducting logic.