Selective Excitation of Superconducting Qubits with a Shared Control Line through Pulse Shaping

Abstract

In conventional architectures of superconducting quantum computers, each qubit is connected to its own control line, leading to a commensurate increase in the number of microwave lines as the system scales. Frequency-multiplexed qubit control addresses this problem by enabling multiple qubits to share a single microwave line. However, it can cause unwanted excitation of non-target qubits, especially when the detuning between qubits is smaller than the pulse bandwidth. Here, we propose a selective-excitation-pulse (SEP) technique that suppresses unwanted excitations by shaping a drive pulse to create null points at non-target qubit frequencies. In a proof-of-concept experiment with three fixed-frequency transmon qubits, we demonstrate that the SEP technique achieves single-qubit gate fidelities comparable to those obtained with conventional Gaussian pulses while effectively suppressing unwanted excitations in non-target qubits. These results highlight the SEP technique as a promising tool for enhancing frequency-multiplexed qubit control.

References in corpus (18)

• Charge insensitive qubit design derived from the Cooper pair box
• Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
• NMR Techniques for Quantum Control and Computation
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Robust randomized benchmarking of quantum processes
• Efficient Z-Gates for Quantum Computing
• Two-qubit silicon quantum processor with operation fidelity exceeding 99%
• Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit
• The impact of classical control electronics on qubit fidelity
• Improving frequency selection of driven pulses using derivative-based transition suppression
• Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold
• Reducing leakage of single-qubit gates for superconducting quantum processors using analytical control pulse envelopes
• Overcoming I/O bottleneck in superconducting quantum computing: multiplexed qubit control with ultra-low-power, base-temperature cryo-CMOS multiplexer
• NMR Quantum Logic Gates for Homonuclear Spin Systems
• Microwave-multiplexed qubit controller using adiabatic superconductor logic
• Robust Quantum Gates against Correlated Noise in Integrated Quantum Chips
• Baseband control of superconducting qubits with shared microwave drives
• Suppressing spurious transitions using spectrally balanced pulse

Cited by in corpus (2)

• Overhead in Quantum Circuits with Time-Multiplexed Qubit Control
• Orthogonal frequency-division multiplexing for simultaneous gate operations on multiple qubits via a shared control line