Two-qubit gate using conditional driving for highly detuned Kerr-nonlinear parametric oscillators

• URL: http://arxiv.org/abs/2204.03347v2
• Date: Wed, 2 Nov 2022 07:40:39 GMT
• Title: Two-qubit gate using conditional driving for highly detuned Kerr-nonlinear parametric oscillators
• Authors: Hiroomi Chono, Taro Kanao and Hayato Goto
• Abstract summary: We propose a two-qubit gate $R_zz$ for highly detuned KPOs. We perform simulations using a conventional KPO Hamiltonian derived from a superconducting-circuit model. The simulation results indicate that two-qubit gates can be implemented with high fidelity.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A Kerr-nonlinear parametric oscillator (KPO) is one of the promising devices to realize qubits for universal quantum computing. The KPO can stabilize two coherent states with opposite phases, yielding a quantum superposition called a Schr\"{o}dinger cat state. Universal quantum computing with KPOs requires three kinds of quantum gates: $R_z, R_x$, and $R_{zz}$ gates. We theoretically propose a two-qubit gate $R_{zz}$ for highly detuned KPOs. In the proposed scheme, we add another two-photon drive for the first KPO. This leads to the $R_{zz}$ gate based on the driving of the second KPO depending on the first-KPO state, which we call "conditional driving." First, we perform simulations using a conventional KPO Hamiltonian derived from a superconducting-circuit model under some approximations and evaluate the gate fidelity. Next, we also perform numerical simulations of the two-qubit gate using the superconducting-circuit model without the approximations. The simulation results indicate that two-qubit gates can be implemented with high fidelity ($>99.9\%$) for rotation angles required for universality.

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