Controllable non-Hermitian qubit-qubit Coupling in Superconducting quantum Circuit

• URL: http://arxiv.org/abs/2404.03397v3
• Date: Tue, 17 Dec 2024 06:45:04 GMT
• Title: Controllable non-Hermitian qubit-qubit Coupling in Superconducting quantum Circuit
• Authors: Hui Wang, Yan-Jun Zhao, Xun-Wei Xu,
• Abstract summary: We propose a theoretical scheme to realize the controllable non-Hermitian qubit-qubit coupling by adding a high-loss resonator. The EPs and non-reciprocity can affect the quantum states' evolutions and exchange efficiencies for two qubits in the non-Hermitian superconducting circuit.
• Score: 3.18175475159604
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• Abstract: We propose a theoretical scheme to realize the controllable non-Hermitian qubit-qubit coupling by adding a high-loss resonator in tunable coupling superconducting quantum circuit. By changing the effective qubit-qubit coupling, phase and amplitude of resonator-qubit interaction, and the qubits' quantum states, we can continually tune the energy level attraction, position of EP (exceptional point), and the nonreciprocity in the non-Hermitian superconducting circuit. The EPs and non-reciprocity can affect the quantum states' evolutions and exchange efficiencies for two qubits in the non-Hermitian superconducting circuit. The controllable non-Hermitian and nonreciprocal interactions between two qubits provide a new insights and methods for exploring the unconventional quantum effects in superconducting quantum circuit.

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