提取量子态的物理扇区
Extracting the physical sector of quantum states
摘要：
任何量子源的物理性质都保证了有限维的有效希尔伯特空间的存在，即物理扇区，在该物理扇区中，它的状态完全以任意高的精度表征。该扇区的提取对于状态层析成像是必不可少的。我们表明，一个国家的物理部门，定义在一些预先选择的基础上，可以系统地检索与程序只使用从一组交换量子测量结果收集的数据，没有其他假设的来源。我们展示了物理部门提取的多功能性和效率，通过将其应用于量子光源的模拟和实验数据，以及有限尺寸的量子系统。
英文摘要：
The physical nature of any quantum source guarantees the existence of an effective Hilbert space of finite dimension, the physical sector, in which its state is completely characterized with arbitrarily high accuracy. The extraction of this sector is essential for state tomography. We show that the physical sector of a state, defined in some pre-chosen basis, can be systematically retrieved with a procedure using only data collected from a set of commuting quantum measurement outcomes, with no other assumptions about the source. We demonstrate the versatility and efficiency of the physical-sector extraction by applying it to simulated and experimental data for quantum light sources, as well as quantum systems of finite dimensions.
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