环形腔中反向光子模式的CNOT门

基于电光效应的二维光子晶体腔光可调谐CNOT（XOR）和XNOR逻辑门设计

Design of Optical Tunable CNOT (XOR) and XNOR Logic Gates Based on 2D-Photonic Crystal Cavity Using Electro-Optic Effect

提出了一种基于二维光子晶体（2DPhC）腔的可调谐CNOT（XOR）和XNOR逻辑门。其中，具有正方形晶格阵列的空气棒已经嵌入到折射率为1.59的Ag-聚合物衬底中。在这项工作中，我们已经提高了速度的逻辑门，通过施加两个输入信号的相位差在同一波长的2DPhC腔。其中，我们已经将输入和控制信号的相位分别调整为π/3和零。结构的响应时间和腔的品质因数分别在飞秒和2000范围内。然后，我们利用基底材料的电光特性来改变腔的共振波长。通过这种方法，我们可以设计的逻辑门，并证明其工作波长的可调范围为23 nm。在波长可调范围内，腔体的品质因数和响应时间近似保持不变。XOR和XNOR逻辑门的最小ON到OFF逻辑电平对比度分别为25.45dB和22.61dB。所提出的逻辑门的比特率可以达到高于0.166 P（Peta）bps的值。根据高快速响应时间与可接受的品质因数的PhC腔，建议的光学逻辑门可以被认为是合适的候选人，如光集成电路和光处理器的应用程序的构建块与一个高速的数据流。

Parity-dependent unidirectional and chiral photon transfer in reversed-dissipation cavity optomechanics

Nonreciprocal elements, such as isolators and circulators, play an important role in classical and quantum information processing. Recently, strong nonreciprocal effects have been experimentally demonstrated in cavity optomechanical systems. In these approaches, the bandwidth of the nonreciprocal photon transmission is limited by the mechanical resonator linewidth, which is arguably much smaller than the linewidths of the cavity modes in most electromechanical or optomechanical devices. In this work, we demonstrate broadband nonreciprocal photon transmission in the \emph{reversed-dissipation} …

基于半导体光腔极限环和放大效应的光学器件

Optical Devices based on Limit Cycles and Amplification in Semiconductor Optical Cavities

在强泵浦功率下，半导体光腔通过一个霍普夫分岔，发生自振荡。我们使用半经典朗之万方程模拟该器件，并评估量子涨落对动力学的影响。在阈值以下，腔充当相位不敏感的线性放大器，噪声$\sim 5\times$大于Caves界限。在阈值之上，极限环充当模拟存储器，并且相扩散$\sim 10\times$大于由标准量子极限设置的界限。我们还模拟了这种振荡器的夹带效应，并基于这种效应提出了一种光学伊辛机和经典的CNOT门。

耦合腔-原子系统中的单光子嵌入本征态

Single-photon embedded eigenstates in coupled cavity-atom systems

将光限制在开放结构中是纳米光子学和腔量子电动力学长期追求的目标。嵌入的本征态提供无限的寿命，尽管存在可用的泄漏通道，但在线性时不变系统中，由于互易性，它们不能从外部被激发。在这里，我们研究如何原子的非线性可以支持单光子嵌入本征态，它可以由多光子激发，然后内部弛豫填充。我们计算的系统动力学和光子捕获，以及反向释放过程中，可以实现任意高的效率。我们还讨论了损失的影响，并对这些概念的实验验证的路径。

Realization of nonlinear optical nonreciprocity on a few-photon level based on atoms strongly coupled to an asymmetric cavity

Optical nonreciprocity is important in photonic information processing to route the optical signal or prevent the reverse flow of noise. By adopting the strong nonlinearity associated with a few atoms in a strongly coupled cavity QED system and an asymmetric cavity configuration, we experimentally demonstrate the nonreciprocal transmission between two counterpropagating light fields with extremely low power. This nonreciprocity can even occur on a few-photon level due to the high optical nonlinearity of the system. The working power can be flexibly tuned by changing the effective number of ato…

Quantum interference control of perfect photon absorption in a three-level atom-cavity system

We analyze a scheme for controlling coherent photon absorption by cavity electromagnetically induced transparency (EIT) in a three-level atom-cavity system. Coherent perfect absorption (CPA) can occur when time-reversed symmetry of lasing process is obtained and destructive interference happens at the cavity interfaces. Generally, the frequency range of CPA is dependent on the decay rates of cavity mirrors. When the control laser is settled, the smaller cavity decay rate causes the wider frequency range of CPA, and the input intensity is larger to satisfy CPA condition for a given frequency. W…