Using PT-symmetric Qubits to Break the Tradeoff Between Fidelity and the Degree of Quantum Entanglement

• URL: http://arxiv.org/abs/2407.08525v3
• Date: Tue, 1 Oct 2024 03:56:34 GMT
• Title: Using PT-symmetric Qubits to Break the Tradeoff Between Fidelity and the Degree of Quantum Entanglement
• Authors: B. -B. Liu, Shi-Lei Su, Y. -L. Zuo, Qiongyi He, Gang Chen, F. Nori, H. Jing,
• Abstract summary: A new approach can efficiently prepare multi-qubit entanglement and use not only bipartite but also tripartite entanglement. This new approach can efficiently prepare multi-qubit entanglement and use not only bipartite but also tripartite entanglement.
• Score: 2.3303130882225185
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A noteworthy discovery is that the minimal evolution time is smaller for parity-time ($\mathcal{PT}$) symmetric systems compared to Hermitian setups. Moreover, there is a significant acceleration of two-qubit quantum entanglement preparation near the exceptional point (EP), or spectral coalescence, within such system. Nevertheless, an important problem often overlooked for quantum EP-based devices is their fidelity, greatly affected by the process of dissipation or post-selection, creating an inherent trade-off relation between the degree of entanglement and fidelity. Our study demonstrates that this limitation can be effectively overcome by harnessing an active $\mathcal{PT}$-symmetric system, which possesses balanced gain and loss, enabling maximal entanglement with rapid speed, high fidelity, and greater resilience to non-resonant errors. This new approach can efficiently prepare multi-qubit entanglement and use not only bipartite but also tripartite entanglement, as illustrative examples, even when the precise gain-loss balance is not strictly maintained. Our analytical findings are in excellent agreement with numerical simulations, confirming the potential of truly $\mathcal{PT}$-devices as a powerful tool for creating and engineering diverse quantum resources for applications in quantum information technology

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