Experimental observation of dynamical blockade between transmon qubits via ZZ interaction engineering
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912829849731072 |
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| author | Riccardi, Marco Moshe, Aviv Glezer Menichetti, Guido Aiudi, Riccardo Cosenza, Carlo Abedi, Ashkan Menta, Roberto Ahmad, Halima Giovanna Orfatti, Diego Nieri Cioni, Francesco Massarotti, Davide Tafuri, Francesco Giovannetti, Vittorio Polini, Marco Caravelli, Francesco Szombati, Daniel |
| author_facet | Riccardi, Marco Moshe, Aviv Glezer Menichetti, Guido Aiudi, Riccardo Cosenza, Carlo Abedi, Ashkan Menta, Roberto Ahmad, Halima Giovanna Orfatti, Diego Nieri Cioni, Francesco Massarotti, Davide Tafuri, Francesco Giovannetti, Vittorio Polini, Marco Caravelli, Francesco Szombati, Daniel |
| contents | We report the experimental realization of strong longitudinal (ZZ) coupling between two superconducting transmon qubits achieved solely through capacitive engineering. By systematically varying the qubit frequency detuning, we measure cross-Kerr inter-qubit interaction strengths ranging from 10 MHz up to 350 MHz, more than an order of magnitude larger than previously observed in similar capacitively coupled systems. In this configuration, the qubits enter a strong-interaction regime in which the excitation of one qubit inhibits that of its neighbor, demonstrating a dynamical blockade mediated entirely by the engineered ZZ coupling. Circuit quantization simulations accurately reproduce the experimental results, while perturbative models confirm the theoretical origin of the energy shift as a hybridization between the computational states and higher-excitation manifolds. We establish a robust and scalable method to access interaction-dominated physics in superconducting circuits, providing a pathway towards solid-state implementations of globally controlled quantum architectures and cooperative many-body dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_11714 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Experimental observation of dynamical blockade between transmon qubits via ZZ interaction engineering Riccardi, Marco Moshe, Aviv Glezer Menichetti, Guido Aiudi, Riccardo Cosenza, Carlo Abedi, Ashkan Menta, Roberto Ahmad, Halima Giovanna Orfatti, Diego Nieri Cioni, Francesco Massarotti, Davide Tafuri, Francesco Giovannetti, Vittorio Polini, Marco Caravelli, Francesco Szombati, Daniel Quantum Physics Mesoscale and Nanoscale Physics Other Condensed Matter Superconductivity We report the experimental realization of strong longitudinal (ZZ) coupling between two superconducting transmon qubits achieved solely through capacitive engineering. By systematically varying the qubit frequency detuning, we measure cross-Kerr inter-qubit interaction strengths ranging from 10 MHz up to 350 MHz, more than an order of magnitude larger than previously observed in similar capacitively coupled systems. In this configuration, the qubits enter a strong-interaction regime in which the excitation of one qubit inhibits that of its neighbor, demonstrating a dynamical blockade mediated entirely by the engineered ZZ coupling. Circuit quantization simulations accurately reproduce the experimental results, while perturbative models confirm the theoretical origin of the energy shift as a hybridization between the computational states and higher-excitation manifolds. We establish a robust and scalable method to access interaction-dominated physics in superconducting circuits, providing a pathway towards solid-state implementations of globally controlled quantum architectures and cooperative many-body dynamics. |
| title | Experimental observation of dynamical blockade between transmon qubits via ZZ interaction engineering |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Other Condensed Matter Superconductivity |
| url | https://arxiv.org/abs/2601.11714 |