Coherent Control of an Exfoliated NbSe$_2$ Homojunction Qubit in a Three-Dimensional Cavity

Abstract Functionalizing quantum devices to extend their range of applications is an extremely active area of research. One of the most promising approaches is to replace aluminum with functional materials. Within this context, van der Waals (vdW) superconductors are ideal candidates because they could enable the integration of their unique properties into qubits. In this work, we present a qubit whose Josephson junction is fabricated from exfoliated NbSe2 using a lithography-free process. Our device exhibits a relaxation time T1 = 275 ±7 ns as well as coherence times T*2 = 136 ± 31 ns and T Echo2 = 203 ± 16 ns. Our work demonstrates the feasibility of integrating vdW superconductors into quantum technologies and represents a first step toward applying quantum non-demolition photon-detection protocols to the challenging field of dark matter searches.

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Publication Details

Journal
Superconductor Science and Technology
Published
2026-10-26
DOI
https://doi.org/10.1088/1361-6668/aeb986
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
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article

Coherent Control of an Exfoliated NbSe$_2$ Homojunction Qubit in a Three-Dimensional Cavity

Carlo Ligi, F. Mattioli, S. Tocci, Andrea Giachero et al.
Superconductor Science and Technology
Quantum Information and Cryptography
article

Coherent Control of an Exfoliated NbSe$_2$ Homojunction Qubit in a Three-Dimensional Cavity

Carlo Ligi, F. Mattioli, S. Tocci, Andrea Giachero, Daniele Di Gioacchino, Claudio D. Gatti, F. Chiarello, Alessandro D’Elia, Cristian Pira, A. Rettaroli, Y. Ma, S. J. Rezvani, alex Komnang Piedjou
article en

Abstract

Abstract Functionalizing quantum devices to extend their range of applications is an extremely active area of research. One of the most promising approaches is to replace aluminum with functional materials. Within this context, van der Waals (vdW) superconductors are ideal candidates because they could enable the integration of their unique properties into qubits. In this work, we present a qubit whose Josephson junction is fabricated from exfoliated NbSe2 using a lithography-free process. Our device exhibits a relaxation time T1 = 275 ±7 ns as well as coherence times T*2 = 136 ± 31 ns and T Echo2 = 203 ± 16 ns. Our work demonstrates the feasibility of integrating vdW superconductors into quantum technologies and represents a first step toward applying quantum non-demolition photon-detection protocols to the challenging field of dark matter searches.

Superconductor Science and Technology
Università di Camerino (IT), Istituto Nazionale di Fisica Nucleare (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), National Research Council (IT), University of Milano-Bicocca (IT)
Openalex Percentile: Top 14%
Quantum Information and Cryptography
DOIOpen Access PDFOpenAlex
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