Cryogenic III-V and Nb electronics integrated on silicon for large-scale quantum computing platforms.

Area of Science:

• Quantum Computing Hardware
• Cryogenic Electronics
• Semiconductor Integration

Background:

• Quantum computing scalability is hindered by qubit size, I/O, and integrability challenges.
• Current cryogenic CMOS electronics for qubit control consume too much power for large-scale systems.
• High-fidelity spin qubits in Si CMOS and integrated control electronics show promise but face power limitations.

Purpose of the Study:

• To develop ultra-low-power cryogenic electronics for controlling millions of quantum bits (qubits).
• To demonstrate the integration of novel III-V and Nb superconductor-based electronics with silicon.
• To overcome the power consumption bottleneck of existing cryogenic control solutions.

Main Methods:

• Fabrication and integration of III-V two-dimensional electron gas and Nb superconductor-based cryogenic electronics with silicon.
• Characterization of device performance at cryogenic temperatures (4 K).
• Measurement of key electronic parameters including unity gain cutoff frequency, unity power gain cutoff frequency, and noise factor.

Main Results:

• Demonstrated integration of III-V and Nb superconductor-based cryogenic electronics with silicon.
• Achieved ultra-low power consumption, over 10 times less than CMOS.
• Devices exhibit high-frequency performance with a unity gain cutoff frequency of 601 GHz and unity power gain cutoff frequency of 593 GHz at 4 K.

Conclusions:

• III-V and Nb superconductor-based cryogenic electronics offer a viable solution for scalable quantum computing.
• The developed technology significantly reduces power consumption, enabling control and readout for millions of qubits.
• This advancement addresses a critical bottleneck in realizing large-scale, fault-tolerant quantum computers.