论文标题
多参数量子关键计量学
Multiparameter quantum critical metrology
论文作者
论文摘要
已知单个参数估计受益于对量子关键系统参数变化的极端敏感性。但是，由于基础系统的量子性质引起的不兼容，对多个参数的同时估计通常受到限制。一个关键问题是，量子关键性是否也可能在降低多个参数的同时估计中的不兼容中发挥积极作用。我们认为通常情况是这种情况，并在接近一阶和二阶相变的范式量子多体系统中验证这一预测。在不同的方案和接近关键的情况下，分析了具有横向和纵向场的抗铁磁和铁磁1-D ising链。
Single parameter estimation is known to benefit from extreme sensitivity to parameter changes in quantum critical systems. However, the simultaneous estimation of multiple parameters is generally limited due to the incompatibility arising from the quantum nature of the underlying system. A key question is whether quantum criticality may also play a positive role in reducing the incompatibility in the simultaneous estimation of multiple parameters. We argue that this is generally the case and verify this prediction in paradigmatic quantum many-body systems close to first and second order phase transitions. The antiferromagnetic and ferromagnetic 1-D Ising chain with both transverse and longitudinal fields are analysed across different regimes and close to criticality.
