双模压缩态的非破坏性区分的局域高斯界
Local Gaussian bounds on the non-destructive discrimination of two-mode squeezed states
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中文总结 AI 辅助
本研究探究利用局域高斯测量对双模压缩态的非破坏性区分，构造最优协议并扩展至含预共享纠缠的情形，将信息增益与扰动的权衡从有限维系统拓展至连续变量系统。
中文摘要 AI 辅助
量子系统中的典型测量装置具有破坏性，意味着测量后量子态会发生不可恢复的改变。本研究分析了利用局域高斯测量对两个双模压缩真空态进行非破坏性区分的问题，探究了区分成功概率与最终态对初始态的保真度之间的权衡关系，并构造了一个由局域高斯测量构成的协议，该协议在我们数值探索的类别中是最优的。我们还将研究扩展到允许额外预共享纠缠的情况，结果表明该情形下可突破保真度-成功概率权衡的标准局域高斯界。本研究将有限维量子系统中已确立的纠缠态区分的信息增益与扰动之间的权衡，自然扩展到了无限维连续变量系统。
英文摘要
Typical measurement setups in quantum systems are destructive, meaning that states are irretrievably altered after measurement. In this work, we analyse non-destructive discrimination of two two-mode squeezed vacuum states using local Gaussian measurements. We investigate a tradeoff relation between the success probability of discrimination and the fidelity of the resulting state with the initial state, and construct a protocol given by local Gaussian measurements, which is optimal within our numerically explored class. We also extend to the case where we allow for additional pre-shared entanglement, and show that this regime allows us to exceed the standard local Gaussian bound for the fidelity-success probability tradeoff. Our work provides a natural extension of the tradeoff between information gain and disturbance in entangled-state discrimination, previously established for finite-dimensional quantum systems, to infinite-dimensional continuous-variable systems.
发表机构
- Korea University（高丽大学）
- Korea Institute for Advanced Study（韩国高等研究院）
- Chungbuk National University（忠北国立大学）
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