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A double-resonator coupler for high-fidelity two-qubit gates between superconducting qubits — arXiv:2609.05222

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.05222
License (as archived): CC0-1.0
Archived: 2026-10-17T00:01:46.090Z
SHA-256 of the archived text: c02c53062eb7142ed541950881bcd1ff4384f0a596ab8afb1879023ce5db82ba
Stable URL of this page: https://metraipolis.com/documento/dc_4792c46b09f6

How to cite

A double-resonator coupler for high-fidelity two-qubit gates between superconducting qubits — arXiv:2609.05222 — arXiv (en), https://arxiv.org/abs/2609.05222 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_4792c46b09f6 (Metraipolis archive dc_4792c46b09f6, sha256 c02c53062eb7142ed541950881bcd1ff4384f0a596ab8afb1879023ce5db82ba)

BibTeX

@misc{dc4792c46b09f6,
  title = {A double-resonator coupler for high-fidelity two-qubit gates between superconducting qubits — arXiv:2609.05222},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.05222},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_4792c46b09f6; sha256 c02c53062eb7142ed541950881bcd1ff4384f0a596ab8afb1879023ce5db82ba},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.05222. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Tunable couplers have enabled two-qubit gate fidelities in superconducting quantum processors to approach $99.9\%$, yet simultaneously suppressing residual interactions and maintaining flexible qubit-frequency allocation remain central challenges for scaling. Here, we propose a double-resonator coupler (DRC) consisting of two resonators interconnected by a single Josephson junction and a capacitor. The hybridized resonator modes provide two mediated exchange paths whose interference controls the qubit-qubit interaction. The DRC enables complete cancellation of residual $ZZ$ interaction for qubit-qubit detunings well outside the straddling regime, even in the absence of direct qubit-qubit coupling, thereby relaxing constraints on frequency allocation and qubit placement. Away from the idle point, the same circuit provides a strong $ZZ$ interaction of approximately $70\,\mathrm{MHz}$, enabling a $20\,\mathrm{ns}$ controlled-Z gate with simulated coherent infidelity below $10^{-5}$. These results establish the DRC as a flexible single-junction coupler architecture for high-fidelity superconducting quantum processors.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-07 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph).
Pagina del lavoro: https://arxiv.org/abs/2609.05222 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-16T23:41:14.315Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-09-07?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).