近日，意大利巴勒莫大学的Alberto Ferrara与Rosario Lo Franco合作并取得一项新进展。经过不懈努力，他们揭示光子量子忆阻器中的纠缠和相干动力学。相关研究成果已于2025年1月13日在国际知名学术期刊《物理评论A》上发表。

在这项工作中，研究人员探索并表征了从这一特定光子量子忆阻器（PQM）模型中涌现出的各种量子特性。首先，研究人员发现单个PQM在其量子相干性上展现出忆阻动力学。其次，研究人员通过分析证明，由两个独立PQM组成的网络可以在相关光子通过网络传播时，对其纠缠和相干性的动力学表现出记忆效应，且这一效应不受光子间距离的影响（假设外部干扰可忽略不计）。

此外，研究人员还在基于真实量子比特的量子计算机（IBM-Q）上构建并运行了PQM的电路模型，结果表明：（1）在特定条件下，该系统可有效用于非线性量子计算；（2）数字量子模拟可以再现非马尔可夫机制下忆阻量子系统的动力学。

据悉，忆阻系统展现出依赖于其过往状态的动力学特性，因此适合作为存储单元。近期，量子忆阻器模型已被提出，值得注意的是，光子量子忆阻器（PQM）已在实验中得到验证。

附：英文原文

Title: Entanglement and coherence dynamics in photonic quantum memristors

Author: Alberto Ferrara and Rosario Lo Franco

Issue&Volume: 2025-01-13

Abstract: Memristive systems exhibit dynamics that depend on their past states, making them useful as memory units. Recently, quantum memristor models have been proposed, and notably, a photonic quantum memristor (PQM) has been experimentally proven. In this work, we explore and characterize various quantum properties that emerge from this specific model of PQM. First, we find that a single PQM displays memristive dynamics on its quantum coherence. Second, we analytically show that a network made of two independent PQMs can manifest memory effects on the dynamics of both entanglement and coherence of correlated photons traveling through the network, regardless of their distance, in the hypothesis of negligible external disturbances. Additionally, we build and run a circuit-model of the PQM on a real qubit-based quantum computer (IBM-Q), showing that (1) this system can effectively be used for nonlinear quantum computing under specific conditions and (2) digital quantum simulations can reproduce the dynamics of a memristive quantum system in a non-Markovian regime.

DOI: 10.1103/PhysRevA.111.012421

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.111.012421