Control of the $ZZ$ coupling between Kerr-cat qubits via transmon couplers
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913201440948224 |
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| author | Aoki, Takaaki Kanao, Taro Goto, Hayato Kawabata, Shiro Masuda, Shumpei |
| author_facet | Aoki, Takaaki Kanao, Taro Goto, Hayato Kawabata, Shiro Masuda, Shumpei |
| contents | Kerr-cat qubits are a promising candidate for fault-tolerant quantum computers owing to the biased nature of their errors. The $ZZ$ coupling between the qubits can be utilized for a two-qubit entangling gate, but the residual coupling called $ZZ$ crosstalk is detrimental to precise computing. In order to resolve this problem, we propose a tunable $ZZ$-coupling scheme using two transmon couplers. By setting the detunings of the two couplers at opposite values, the residual $ZZ$ couplings via the two couplers cancel each other out. We also apply our scheme to the $R_{zz}(Θ)$ gate ($ZZ$ rotation with angle $Θ$), one of the two-qubit entangling gates. We numerically show that the fidelity of the $R_{zz}(-π/2)$ gate is higher than 99.9% in a case of $16$-ns gate time and without decoherence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_16622 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Control of the $ZZ$ coupling between Kerr-cat qubits via transmon couplers Aoki, Takaaki Kanao, Taro Goto, Hayato Kawabata, Shiro Masuda, Shumpei Quantum Physics Kerr-cat qubits are a promising candidate for fault-tolerant quantum computers owing to the biased nature of their errors. The $ZZ$ coupling between the qubits can be utilized for a two-qubit entangling gate, but the residual coupling called $ZZ$ crosstalk is detrimental to precise computing. In order to resolve this problem, we propose a tunable $ZZ$-coupling scheme using two transmon couplers. By setting the detunings of the two couplers at opposite values, the residual $ZZ$ couplings via the two couplers cancel each other out. We also apply our scheme to the $R_{zz}(Θ)$ gate ($ZZ$ rotation with angle $Θ$), one of the two-qubit entangling gates. We numerically show that the fidelity of the $R_{zz}(-π/2)$ gate is higher than 99.9% in a case of $16$-ns gate time and without decoherence. |
| title | Control of the $ZZ$ coupling between Kerr-cat qubits via transmon couplers |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2303.16622 |