Related papers: The Pound-Drever-Hall Method for Superconducting-Qubit Readout

The Pound-Drever-Hall Method for Superconducting-Qubit Readout

URL: http://arxiv.org/abs/2512.03138v1
Date: Tue, 02 Dec 2025 19:00:01 GMT
Title: The Pound-Drever-Hall Method for Superconducting-Qubit Readout
Authors: Ibukunoluwa Adisa, Won Chan Lee, Kevin C. Cox, Alicia J. Kollár,
Abstract summary: We present an ultrastable superconducting-qubit readout method using the multi-tone self-phase-referenced Pound-Drever-Hall (PDH) technique.<n>We show that the PDH sideband tones do not cause unwanted measurement-induced state transitions for a transmon qubit, leading to a potential signal enhancement of at least $14$dB over traditional heterodyne readout.
Score: 0.0874967598360817
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Scaling quantum computers to large sizes requires the implementation of many parallel qubit readouts. Here we present an ultrastable superconducting-qubit readout method using the multi-tone self-phase-referenced Pound-Drever-Hall (PDH) technique, originally developed for use with optical cavities. In this work, we benchmark PDH readout of a single transmon qubit, using room-temperature heterodyne detection of all tones to reconstruct the PDH signal. We demonstrate that PDH qubit readout is insensitive to microwave phase drift, displaying $0.73^\circ$ phase stability over 2 hours, and capable of single-shot readout in the presence of phase errors exceeding the phase shift induced by the qubit state. We show that the PDH sideband tones do not cause unwanted measurement-induced state transitions for a transmon qubit, leading to a potential signal enhancement of at least $14$~dB over traditional heterodyne readout.

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