Speeding up entanglement generation by proximity to higher-order exceptional points

• URL: http://arxiv.org/abs/2210.05048v3
• Date: Sat, 9 Sep 2023 02:38:17 GMT
• Title: Speeding up entanglement generation by proximity to higher-order exceptional points
• Authors: Zeng-Zhao Li, Weijian Chen, Maryam Abbasi, Kater W. Murch, and K. Birgitta Whaley
• Abstract summary: Entanglement is a key resource for quantum information technologies ranging from quantum sensing to quantum computing. We study two weakly coupled non-Hermitian qubits and observe entanglement generation at a significantly shorter time scale by proximity to a higher-order exceptional point.
• Score: 0.3532695635285269
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement is a key resource for quantum information technologies ranging from quantum sensing to quantum computing. Conventionally, the entanglement between two coupled qubits is established at the time scale of the inverse of the coupling strength. In this work, we study two weakly coupled non-Hermitian qubits and observe entanglement generation at a significantly shorter time scale by proximity to a higher-order exceptional point. We establish a non-Hermitian perturbation theory based on constructing a biorthogonal complete basis and further identify the optimal condition to obtain the maximally entangled state. Our study of speeding up entanglement generation in non-Hermitian quantum systems opens new avenues for harnessing coherent nonunitary dissipation for quantum technologies.

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