Accelerated quantum control methods

自2021年4月以来，我们主要集中在以下几个方面：1.利用猫态量子比特进行几何量子计算。我们研究了利用光子猫态量子比特实现单量子比特和多量子比特几何门的可能性。我们的结果为单量子比特和多量子比特容错量子计算提供了一种现实的、硬件高效的方法。我们已经从理论上证明了利用反向旋转效应(使用两种不同的协议)可以有效地提高几何量子计算的速度和保真度。这种超快的演化(纳秒，甚至皮秒)显著降低了退相干的影响，使之有可能达到容错计算的阈值。3.我们探索了一种使用非线性经典驱动器来探测腔场中单原子的有效协议。该协议具有压缩强度和压缩腔模频率可控、原子-腔场耦合强度呈指数增强等优点。我们从理论上提出了通过控制光学暗模式来实现真正的三体光机纠缠。比DMU政权下的情况要好。这项研究可以构建具有暗模式免疫性和噪声容忍性的大规模纠缠网络，并为量子信息处理和量子计量提供了一系列令人兴奋的机会。

Since Apr. 2021, we have focused on the following topics:1. Using cat-state qubits for geometric quantum computing. We have investigated the possibility of using photonic cat-state qubits for implementing single- and multi-qubit geometric gates. Our results offer a realistic and hardware-efficient method for both single- and multi-qubit fault-tolerant quantum computation.2. We have theoretically shown that employing counter-rotating effects (using two different protocols) can effectively improve both the speed and fidelity of geometric quantum computation. Such an ultrafast evolution (nanoseconds, even picoseconds) significantly reduces the influence of decoherence, making it possible to reach the threshold of fault-tolerant computing.3.We have explored an efficient protocol to sense single atoms in a cavity field using a nonlinear classical drive. The proposed protocol possesses many advantages, such as controllable squeezing strength and squeezed-cavity-mode frequency, and exponential enhancement of atom-cavity coupling strength.4. We have theoretically proposed to realize a genuine tripartite optomechanical entanglement via the control of an optical dark mode. than that in the DMU regime. The study can enable constructing large-scale entanglement networks with the dark-mode-immunity and noise-tolerance, and opens up a range of exciting opportunities for quantum information processing and quantum metrology protected against dark modes.