Control of the ZZ coupling between Kerr cat qubits via transmon couplers
Takaaki Aoki, Taro Kanao, Hayato Goto, Shiro Kawabata, Shumpei Masuda
DOI 10.1103/PhysRevApplied.21.014030 · Physical Review Applied
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Abstract
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 RZZ(Θ) gate (ZZ rotation with angle Θ), one of the two-qubit entangling gates. We numerically show that the fidelity of the RZZ(−π/2) gate is higher than 99.9% in a case of 16-ns gate time and without decoherence.
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