Fast, tunable, high fidelity cZ-gates between superconducting qubits with parametric microwave control of ZZ-coupling
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arXiv
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| Format: | Preprint |
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2023
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| author | Jin, X. Y. Cicak, K. Parrott, Z. Kotler, S. Lecocq, F. Teufel, J. Aumentado, J. Kapit, E. Simmonds, R. W. |
| author_facet | Jin, X. Y. Cicak, K. Parrott, Z. Kotler, S. Lecocq, F. Teufel, J. Aumentado, J. Kapit, E. Simmonds, R. W. |
| contents | Future quantum information processors require tunable coupling architectures that can produce high fidelity logical gates between two or more qubits. Parametric coupling is a powerful technique for generating tunable interactions between many qubits. Here, we present a highly flexible parametric coupling scheme with superconducting qubits that provides complete removal of residual $ZZ$ coupling and the implementation of driven SWAP or SWAP-free controlled-$Z$ (c$Z$) gates. Our fully integrated, 2D on-chip coupler design is only weakly flux tunable, cancels static linear coupling between the qubits, avoids internal coupler dynamics or excitations, and is extensible to multi-qubit circuit-QED systems. Exploring gate fidelity versus gate duration allows us to maximize two-qubit gate fidelity, while providing insights into possible error sources for these gates. Randomized benchmarking over several hours reveals that the parametric SWAP c$Z$ gate achieves an average fidelity of $99.44\pm 0.09$\% in a gate duration of 70~ns and a dispersively driven parametric SWAP-free c$Z$ gate attains an average fidelity of $99.47\pm 0.07$\% in only 30~ns. The fidelity remained above this value for over 8~hours and peaked twice with a maximum of $99.67\pm 0.14$\%. Overall, our parametric approach combines versatility, precision, speed, and high performance in one compact coupler design. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_02907 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Fast, tunable, high fidelity cZ-gates between superconducting qubits with parametric microwave control of ZZ-coupling Jin, X. Y. Cicak, K. Parrott, Z. Kotler, S. Lecocq, F. Teufel, J. Aumentado, J. Kapit, E. Simmonds, R. W. Quantum Physics Future quantum information processors require tunable coupling architectures that can produce high fidelity logical gates between two or more qubits. Parametric coupling is a powerful technique for generating tunable interactions between many qubits. Here, we present a highly flexible parametric coupling scheme with superconducting qubits that provides complete removal of residual $ZZ$ coupling and the implementation of driven SWAP or SWAP-free controlled-$Z$ (c$Z$) gates. Our fully integrated, 2D on-chip coupler design is only weakly flux tunable, cancels static linear coupling between the qubits, avoids internal coupler dynamics or excitations, and is extensible to multi-qubit circuit-QED systems. Exploring gate fidelity versus gate duration allows us to maximize two-qubit gate fidelity, while providing insights into possible error sources for these gates. Randomized benchmarking over several hours reveals that the parametric SWAP c$Z$ gate achieves an average fidelity of $99.44\pm 0.09$\% in a gate duration of 70~ns and a dispersively driven parametric SWAP-free c$Z$ gate attains an average fidelity of $99.47\pm 0.07$\% in only 30~ns. The fidelity remained above this value for over 8~hours and peaked twice with a maximum of $99.67\pm 0.14$\%. Overall, our parametric approach combines versatility, precision, speed, and high performance in one compact coupler design. |
| title | Fast, tunable, high fidelity cZ-gates between superconducting qubits with parametric microwave control of ZZ-coupling |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2305.02907 |