High-fidelity QND readout and measurement back-action in a Tantalum-based high-coherence fluxonium qubit

Fuente: arXiv
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Autori principali: Bothara, Gaurav, Das, Srijita, Salunkhe, Kishor V, Chand, Madhavi, Deshmukh, Jay, Patankar, Meghan P, Vijay, R
Natura: Preprint
Pubblicazione: 2025
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author Bothara, Gaurav
Das, Srijita
Salunkhe, Kishor V
Chand, Madhavi
Deshmukh, Jay
Patankar, Meghan P
Vijay, R
author_facet Bothara, Gaurav
Das, Srijita
Salunkhe, Kishor V
Chand, Madhavi
Deshmukh, Jay
Patankar, Meghan P
Vijay, R
contents Implementing a precise measurement of the quantum state of a qubit is very critical for building a practical quantum processor as it plays an important role in state initialization and quantum error correction. While the transmon qubit has been the most commonly used design in small to medium-scale processors, the fluxonium qubit is emerging as a strong alternative with the potential for high-fidelity gate operation as a result of the high anharmonicity and high coherence achievable due to its unique design. Here, we explore the measurement characteristics of a tantalum-based high-coherence fluxonium qubit and demonstrate single-shot measurement fidelity (assignment fidelity) of 96.2% and 97.8% without and with the use of a Josephson Parametric Amplifier respectively. We study the back-action of the measurement photons on the qubit and measure a QND (repeatability) fidelity of 99.6%. We find that the measurement fidelity and QND nature are limited by state-mixing errors and our results suggest that a careful study of measurement-induced transitions in the fluxonium is needed to further optimize the readout performance.
format Preprint
id arxiv_https___arxiv_org_abs_2501_16691
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle High-fidelity QND readout and measurement back-action in a Tantalum-based high-coherence fluxonium qubit
Bothara, Gaurav
Das, Srijita
Salunkhe, Kishor V
Chand, Madhavi
Deshmukh, Jay
Patankar, Meghan P
Vijay, R
Quantum Physics
Implementing a precise measurement of the quantum state of a qubit is very critical for building a practical quantum processor as it plays an important role in state initialization and quantum error correction. While the transmon qubit has been the most commonly used design in small to medium-scale processors, the fluxonium qubit is emerging as a strong alternative with the potential for high-fidelity gate operation as a result of the high anharmonicity and high coherence achievable due to its unique design. Here, we explore the measurement characteristics of a tantalum-based high-coherence fluxonium qubit and demonstrate single-shot measurement fidelity (assignment fidelity) of 96.2% and 97.8% without and with the use of a Josephson Parametric Amplifier respectively. We study the back-action of the measurement photons on the qubit and measure a QND (repeatability) fidelity of 99.6%. We find that the measurement fidelity and QND nature are limited by state-mixing errors and our results suggest that a careful study of measurement-induced transitions in the fluxonium is needed to further optimize the readout performance.
title High-fidelity QND readout and measurement back-action in a Tantalum-based high-coherence fluxonium qubit
topic Quantum Physics
url https://arxiv.org/abs/2501.16691