Experimental Virtual Quantum Broadcasting

• URL: http://arxiv.org/abs/2501.11390v1
• Date: Mon, 20 Jan 2025 10:33:35 GMT
• Title: Experimental Virtual Quantum Broadcasting
• Authors: Yuxuan Zheng, Xinfang Nie, Hongfeng Liu, Yutong Luo, Dawei Lu, Xiangjing Liu,
• Abstract summary: We develop a quantum circuit integrated with a post-processing protocol to implement virtual quantum broadcasting. We experimentally verify the closest physical map, known as the optimal quantum cloner, to the virtual broadcasting map. We identify the difference in statistical outcomes between the input of the optimal quantum cloner and its local output as the fundamental error imposed by quantum mechanics.
• Score: 1.2050877805909537
• License:
• Abstract: The quantum no-broadcasting theorem states that it is fundamentally impossible to perfectly replicate an arbitrary quantum state, even if correlations between the copies are allowed. While quantum broadcasting cannot occur through any physical process, it can be realized virtually through a process called virtual quantum broadcasting (VQB), which is described by a Hermitian-preserving and trace-preserving map. In this work, we first leverage the concept of the linear combination of unitaries and design a quantum circuit integrated with a post-processing protocol to implement VQB and demonstrate it in a nuclear magnetic resonance system. Then, we experimentally verify the closest physical map, known as the optimal quantum cloner, to the virtual broadcasting map, by comparing the trace distance between Choi states of the VQB map and a given set of physical maps. Finally, we identify the difference in statistical outcomes between the input of the optimal quantum cloner and its local output as the fundamental error imposed by quantum mechanics and show how VQB suppresses this error. Our method applies to quantum systems of any dimension.

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