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Quantum state truncation using an optical parametric amplifier and a beam splitter
Physical Review A ( IF 2.9 ) Pub Date : 2021-09-24 , DOI: 10.1103/physreva.104.033715 E. P. Mattos , A. Vidiella-Barranco
Physical Review A ( IF 2.9 ) Pub Date : 2021-09-24 , DOI: 10.1103/physreva.104.033715 E. P. Mattos , A. Vidiella-Barranco
We present a scheme of quantum state truncation in the Fock basis (quantum scissors), based on the combined action of a nondegenerate optical parametric amplifier and a beam splitter. Differently from previously proposed linear-optics-based quantum scissors devices, which depend on reliable Fock state sources, our scheme requires only readily available Gaussian states, such as coherent state inputs (vacuum state included). A truncated state is generated after performing photodetections in the global state. We find that, depending on which output ports each of the two photodetectors is positioned, different types of truncated states may be produced: (i) states having a maximum Fock number of , or (ii) states having a minimum Fock number . In order to illustrate our method, we discuss an example having as input states a coherent state in the beam splitter and vacuum states in the amplifier, and show that the resulting truncated states display nonclassical properties, such as sub-Poissonian statistics and squeezing. We quantify the nonclassicality degree of the generated states using the Wigner-Yanase skew information measure. For complementarity, we discuss the efficiency of the protocol, e.g., generation probability as well as the effects of imperfections such as the detector's quantum efficiency and dark counts rate.
中文翻译:
使用光学参量放大器和分束器进行量子态截断
我们提出了一种基于非简并光学参量放大器和分束器的组合作用的 Fock 基(量子剪刀)中的量子态截断方案。与之前提出的依赖于可靠 Fock 状态源的基于线性光学的量子剪刀设备不同,我们的方案只需要现成的高斯状态,例如相干状态输入(包括真空状态)。在全局状态下执行光电检测后会生成截断状态。我们发现,根据两个光电探测器中的每一个的输出端口,可能会产生不同类型的截断状态:(i)具有最大 Fock 数的状态,或 (ii) 具有最小 Fock 数的州 . 为了说明我们的方法,我们讨论了一个示例,该示例将分束器中的相干状态和放大器中的真空状态作为输入状态,并表明所产生的截断状态显示出非经典属性,例如亚泊松统计和压缩。我们使用 Wigner-Yanase 偏斜信息度量来量化生成状态的非经典性程度。为了互补,我们讨论了协议的效率,例如生成概率以及缺陷的影响,例如探测器的量子效率和暗计数率。
更新日期:2021-09-24
中文翻译:
使用光学参量放大器和分束器进行量子态截断
我们提出了一种基于非简并光学参量放大器和分束器的组合作用的 Fock 基(量子剪刀)中的量子态截断方案。与之前提出的依赖于可靠 Fock 状态源的基于线性光学的量子剪刀设备不同,我们的方案只需要现成的高斯状态,例如相干状态输入(包括真空状态)。在全局状态下执行光电检测后会生成截断状态。我们发现,根据两个光电探测器中的每一个的输出端口,可能会产生不同类型的截断状态:(i)具有最大 Fock 数的状态,或 (ii) 具有最小 Fock 数的州 . 为了说明我们的方法,我们讨论了一个示例,该示例将分束器中的相干状态和放大器中的真空状态作为输入状态,并表明所产生的截断状态显示出非经典属性,例如亚泊松统计和压缩。我们使用 Wigner-Yanase 偏斜信息度量来量化生成状态的非经典性程度。为了互补,我们讨论了协议的效率,例如生成概率以及缺陷的影响,例如探测器的量子效率和暗计数率。