论文标题
量子计量学，量子惠茨通桥由玻色系统组成
Quantum metrology with quantum Wheatstone bridge composed of Bose systems
论文作者
论文摘要
最近，最近提出了使用边界驱动系统建造的特殊古典惠特斯通桥的量子版本。我们提出了一个由Bose系统组成的量子惠特石桥，该桥可以模拟一般的古典惠特石桥。当量子惠特石桥平衡时，可以获得未知的耦合，这可以简单地通过同源性检测确定。当同伴检测的期望值为0时，量子惠特石桥是不平衡的。调节已知的耦合强度，以使同基检测的期望值与玻色子初始数量的平方根成正比，这意味着量子惠特斯通桥是平衡的。通过计算量子Fisher信息，我们表明，当量子惠特石桥平衡时，测量精度是最佳的。在低温浴缸的情况下，同源性检测接近最佳测量。
The quantum version of a special classical Wheatstone bridge built with a boundary-driven spin system has recently been proposed. We propose a quantum Wheatstone bridge consisting of Bose systems, which can simulate the general classical Wheatstone bridge. Unknown coupling can be obtained when the quantum Wheatstone bridge is balanced, which can be determined simply by the homodyne detection. When the expectation value of the homodyne detection is 0, the quantum Wheatstone bridge is unbalanced. Regulate a known coupling strength to make the expectation value of the homodyne detection be proportional to the square root of the initial number of bosons, which means that the quantum Wheatstone bridge is balanced. By calculating the quantum Fisher information, we show that the measurement precision is optimal when the quantum Wheatstone bridge is balanced. And the homodyne detection is close to the optimal measurement in the case of low-temperature baths.
