Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity

Abstract

We investigate theoretically the implementation of two-qubit gates in a system of two coupled superconducting qubits. In particular, we analyze two-qubit gate operations under the condition that the coupling strength is comparable to or even larger than the anharmonicity of the qubits. By numerically solving the time-dependent Schrödinger equation, we obtain the dependence of the two-qubit gate fidelity on the system parameters in the case of direct and indirect qubit-qubit coupling. Our numerical results can be used to identify the "safe" parameter regime for experimentally implementing two-qubit gates with high fidelity in these systems.

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• Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity
• External Momentum, Volume Effects, and the Nucleon Magnetic Moment

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• Optimal control for fast and high-fidelity quantum gates in coupled superconducting flux qubits
• Pseudo-2D superconducting quantum computing circuit for the surface code: the proposal and preliminary tests
• Two-qubit gate operations in superconducting circuits with strong coupling and weak anharmonicity
• Speed limits for two-qubit gates with weakly anharmonic qubits
• Left-handed superlattice metamaterials for circuit QED
• Classical-Quantum Noise Mitigation for NISQ Hardware
• Superfluid-Mott-insulator transition in superconducting circuits with weak anharmonicity
• Single-photon-induced two qubits excitation without breaking parity symmetry
• Switchable dynamics in the deep-strong-coupling regime
• Cost of Emulating a Small Quantum Annealing Problem in the Circuit-Model
• Excitation spectrum as a resource for efficient two-qubit entangling gates
• Generation of photons from vacuum in cavity via time-modulation of a qubit invisible to the field
• Hamiltonian simulation with explicit formulas for Digital-Analog Quantum Computing