Proposal for erasure conversion in integer fluxonium qubits

Quantum Physics [Submitted on 22 Mar 2026] Proposal for erasure conversion in integer fluxonium qubits Jiakai Wang, Raymond A. Mencia, Vladimir E. Manucharyan, Maxim G. Vavilov We propose an erasure conversion scheme on the |e\rangle-|f\rangle and |g\rangle-|f\rangle qubits in integer fluxonium qubits (IFQs), which are both first-order insensitive to 1/f flux noise. The |e\rangle-|f\rangle transition is identical to that of a usual fluxonium qubit and hence is expected to have excellent coherence time, while the |g\rangle-|f\rangle transition is additionally protected from the energy relaxation by the parity symmetry. The dominant error in both qubits arises due to the energy relaxation: from |e\rangle to |g\rangle in the e\text{--}f qubit and from |f\rangle to |e\rangle in the g\text{--}f qubit. Such errors can be treated as erasure events, and their efficient detection improves the performance of quantum error-correcting codes. We consider a protocol for such erasure conversion based on the dispersive readout. Our main finding is that, with proper circuit parameter choice, carefully designed gate sets, and the integration of erasure conversion, IFQs promise high effective coherence times. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.21003 [quant-ph]   (or arXiv:2603.21003v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.21003 Focus to learn more Submission history From: Jiakai Wang [view email] [v1] Sun, 22 Mar 2026 01:33:48 UTC (2,330 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)