Cancelling microwave crosstalk with fixed-frequency qubits

Abstract

Scalable quantum information processing requires that modular gate operations can be executed in parallel. The presence of crosstalk decreases the individual addressability, causing erroneous results during simultaneous operations. For superconducting qubits which operate in the microwave regime, electromagnetic isolation is often limited due to design constraints, leading to signal crosstalk that can deteriorate the quality of simultaneous gate operations. Here, we propose and demonstrate a method based on AC Stark effect for calibrating the microwave signal crosstalk. The method is suitable for processors based on fixed-frequency qubits which are known for high coherence and simple control. The optimal compensation parameters can be reliably identified from a well-defined interference pattern. We implement the method on an array of 7 superconducting qubits, and show its effectiveness in removing the majority of crosstalk errors.

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• Control and mitigation of microwave crosstalk effect with superconducting qubits
• Multi-Level Variational Spectroscopy using a Programmable Quantum Simulator
• Tantalum airbridges for scalable superconducting quantum processors
• Role of parasitic interactions and microwave crosstalk in dispersive control of two superconducting artificial atoms
• Collateral coupling between superconducting resonators: Fast and high fidelity generation of qudit-qudit entanglement
• Suppressing spurious transitions using spectrally balanced pulse