Urrego Daniel F, Álvarez Juan-Rafael, Calderón-Losada Omar, Svozilík Jiří, Nuñez Mayerlin, Valencia Alejandra
Opt Express. 2018 Apr 30;26(9):11940-11949. doi: 10.1364/OE.26.011940.
We present the experimental implementation and theoretical model of a controllable dephasing quantum channel using photonic systems. The channel is implemented by coupling the polarization and the spatial distribution of light that play, in the perspective of open quantum systems, the role of quantum system and environment, respectively. The capability of controlling our channel allows us to visualize its effects in a quantum system. Different from standard dephasing channels, our channel presents an exotic behavior in the sense that the evolution of a state, from a pure to a mixed state, shows an oscillatory behavior if tracked in the Bloch sphere. Additionally, we report the evolution of the purity and perform a quantum process tomography to obtain the χ matrix associated to our channel.
我们展示了一种使用光子系统的可控退相量子通道的实验实现和理论模型。该通道通过耦合光的偏振和空间分布来实现，从开放量子系统的角度来看，它们分别扮演量子系统和环境的角色。对我们的通道进行控制的能力使我们能够在量子系统中直观呈现其效果。与标准退相通道不同，我们的通道呈现出一种奇特的行为，即从纯态到混合态的态演化在布洛赫球中追踪时会表现出振荡行为。此外，我们报告了纯度的演化，并进行量子过程层析成像以获得与我们的通道相关的χ矩阵。
