Purcell filtering for qubit readout using intrinsic geometric multi-modes of the transmon

Bakr, Mustafa, Alghadeer, Mohammed, Fasciati, Simone D., Cao, Shuxiang, Amari, Smain, Piscitelli, Michele, Taravati, Sajjad and Leek, Peter J. (2024) Purcell filtering for qubit readout using intrinsic geometric multi-modes of the transmon. Bulletin of the American Physical Society, [G48.00015].

Abstract

Over the past two decades, superconducting circuits have become pivotal in quantum computing, achieving quantum logic gates with minimal errors. As we address the challenges of scaling, the role of microwave engineering, particularly in enhancing the lifetime and coherence of transmons at a reduced system complexity, becomes crucial. Here, we report a novel Purcell filtering technique in cQED by utilising the intrinsic multiple geometric modes of the quantum circuit. The precise control of the coupling strength and the relative phase between the transmon and these higher order geometric modes can result in constructive or destructive interference effects at prescribed frequencies, e.g. the qubit frequency. This can impact the effective coupling strength and energy exchange dynamics between the transmon, the readout resonator, and the external driving ports, and it can be utilised to engineer Purcell filtering without introducing additional circuitry to the quantum processor such as a quarter-wavelength bandstop filter or an always active multiple drives.

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Contributors

Author: Sajjad Taravati

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