ZZ-Free Two-Transmon CZ Gate Mediated by a Fluxonium Coupler
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909885699981312 |
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| author | An, Junyoung Zhang, Helin Ding, Qi Ding, Leon Sung, Youngkyu Winik, Roni Kim, Junghyun Rosen, Ilan T. Azar, Kate Piñero, Renee DePencier Gertler, Jeffrey M. Gingras, Michael Niedzielski, Bethany M. Stickler, Hannah Schwartz, Mollie E. Wang, Joel Î-j. Orlando, Terry P. Gustavsson, Simon Hays, Max Grover, Jeffrey A. Serniak, Kyle Oliver, William D. |
| author_facet | An, Junyoung Zhang, Helin Ding, Qi Ding, Leon Sung, Youngkyu Winik, Roni Kim, Junghyun Rosen, Ilan T. Azar, Kate Piñero, Renee DePencier Gertler, Jeffrey M. Gingras, Michael Niedzielski, Bethany M. Stickler, Hannah Schwartz, Mollie E. Wang, Joel Î-j. Orlando, Terry P. Gustavsson, Simon Hays, Max Grover, Jeffrey A. Serniak, Kyle Oliver, William D. |
| contents | Eliminating residual ZZ interactions in a two-qubit system is essential for reducing coherent errors during quantum operations. In a superconducting circuit platform, coupling two transmon qubits via a transmon coupler has been shown to effectively suppress residual ZZ interactions. However, in such systems, perfect cancellation usually requires the qubit-qubit detuning to be smaller than the individual qubit anharmonicities, which exacerbates frequency crowding and microwave crosstalk. To address this limitation, we introduce TFT (Transmon-Fluxonium-Transmon) architecture, wherein two transmon qubits are coupled via a fluxonium qubit. The coupling mediated by the fluxonium eliminates residual ZZ interactions even for transmons detuned larger than their anharmonicities. We experimentally identified zero-ZZ interaction points at qubit-qubit detunings of 409 MHz and 616 MHz from two distinct TFT devices. We then implemented an adiabatic, coupler-flux-biased controlled-Z gate on both devices, achieving CZ gate fidelities of 99.64(6)% and 99.68(8)%. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_02115 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | ZZ-Free Two-Transmon CZ Gate Mediated by a Fluxonium Coupler An, Junyoung Zhang, Helin Ding, Qi Ding, Leon Sung, Youngkyu Winik, Roni Kim, Junghyun Rosen, Ilan T. Azar, Kate Piñero, Renee DePencier Gertler, Jeffrey M. Gingras, Michael Niedzielski, Bethany M. Stickler, Hannah Schwartz, Mollie E. Wang, Joel Î-j. Orlando, Terry P. Gustavsson, Simon Hays, Max Grover, Jeffrey A. Serniak, Kyle Oliver, William D. Quantum Physics Eliminating residual ZZ interactions in a two-qubit system is essential for reducing coherent errors during quantum operations. In a superconducting circuit platform, coupling two transmon qubits via a transmon coupler has been shown to effectively suppress residual ZZ interactions. However, in such systems, perfect cancellation usually requires the qubit-qubit detuning to be smaller than the individual qubit anharmonicities, which exacerbates frequency crowding and microwave crosstalk. To address this limitation, we introduce TFT (Transmon-Fluxonium-Transmon) architecture, wherein two transmon qubits are coupled via a fluxonium qubit. The coupling mediated by the fluxonium eliminates residual ZZ interactions even for transmons detuned larger than their anharmonicities. We experimentally identified zero-ZZ interaction points at qubit-qubit detunings of 409 MHz and 616 MHz from two distinct TFT devices. We then implemented an adiabatic, coupler-flux-biased controlled-Z gate on both devices, achieving CZ gate fidelities of 99.64(6)% and 99.68(8)%. |
| title | ZZ-Free Two-Transmon CZ Gate Mediated by a Fluxonium Coupler |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2511.02115 |