Multiplexed control scheme for scalable quantum information processing with superconducting qubits

TL;DR

This paper proposes a multiplexed control scheme for superconducting qubits that reduces wiring complexity and enhances scalability by enabling simultaneous, independent control of many qubits using shared control lines.

Contribution

It introduces a novel multiplexed control approach combining frequency multiplexing and tuning, significantly reducing control wiring for scalable quantum processors.

Findings

Reduces control line count by 10 to 100 times

Enables parallel, independent gate operations

Improves scalability of superconducting qubit systems

Abstract

The advancement of scalable quantum information processing relies on the accurate and parallel manipulation of a vast number of qubits, potentially reaching into the millions. Superconducting qubits, traditionally controlled through individual circuitry, currently face a formidable scalability challenge due to the excessive use of wires. This challenge is nearing a critical point where it might soon surpass the capacities of on-chip routing, I/O packaging, testing platforms, and economically feasible solutions. Here we introduce a multiplexed control scheme that efficiently utilizes shared control lines for operating multiple qubits and couplers. By integrating quantum hardware-software co-design, our approach utilizes advanced techniques like frequency multiplexing and individual tuning. This enables simultaneous and independent execution of single- and two-qubit gates with significantly simplified wiring. This scheme has the potential to diminish the number of control lines by one to two orders of magnitude in the near future, thereby substantially enhancing the scalability of superconducting quantum processors.