Spin-qubit control with a milli-kelvin CMOS chip.

Area of Science:

• Quantum computing hardware
• Solid-state quantum information science
• Semiconductor device engineering

Background:

• Spin qubits offer a small footprint for scalable quantum computation.
• Integrating control electronics with qubits at cryogenic temperatures is challenging due to heat and crosstalk.
• Existing control methods require extensive wiring, hindering scalability.

Purpose of the Study:

• To benchmark silicon metal-oxide-semiconductor (MOS)-style electron spin qubits controlled by integrated cryo-CMOS circuits.
• To assess the impact of milli-kelvin control on single- and two-qubit gate performance.
• To demonstrate the feasibility of a 'chiplet-style' architecture for scalable quantum control.

Main Methods:

• Heterogeneously integrating cryo-CMOS circuits with silicon MOS spin qubits.
• Operating the integrated system at milli-kelvin temperatures.
• Performing universal logic operations and benchmarking gate fidelities.

Main Results:

• Cryo-CMOS circuits successfully performed universal logic operations for spin qubits.
• Milli-kelvin control demonstrated minimal degradation of single- and two-qubit gate performance.
• The integrated platform, comprising ~100,000 transistors, operated with low power density.

Conclusions:

• Heterogeneously integrated cryo-CMOS provides a scalable solution for controlling silicon spin qubits.
• This 'chiplet-style' architecture overcomes wiring density limitations for quantum computing.
• The demonstrated performance at milli-kelvin temperatures paves the way for large-scale quantum processors.