量子计算和通信中用于反馈和前馈的低延迟数字信号处理
Low-Latency Digital Signal Processing for Feedback and Feedforward in Quantum Computing and Communication
摘要：
量子计算架构依赖于经典电子学来进行控制和读出。在具有量子系统的反馈回路中采用经典电子学允许稳定状态、校正错误并实现特定的基于前馈的量子计算和通信方案，诸如确定性量子隐形传态。与量子系统的相干时间相比，这些反馈和前馈操作需要快速，以最小化错误的概率。我们提出了一种基于现场可编程门阵列（FPGA）的数字信号处理系统，能够实时正交解调，量子比特状态的确定和状态相关的反馈触发信号的产生。相对于模拟输入信号的定时，以$110\,\mathrm{ns}$的延迟生成反馈触发。我们表征了基于超导量子比特的色散读出的主动量子比特初始化协议的系统的性能，并讨论了反馈和前馈算法中的潜在应用。
英文摘要：
Quantum computing architectures rely on classical electronics for control and readout. Employing classical electronics in a feedback loop with the quantum system allows to stabilize states, correct errors and to realize specific feedforward-based quantum computing and communication schemes such as deterministic quantum teleportation. These feedback and feedforward operations are required to be fast compared to the coherence time of the quantum system to minimize the probability of errors. We present a field programmable gate array (FPGA) based digital signal processing system capable of real-time quadrature demodulation, determination of the qubit state and generation of state-dependent feedback trigger signals. The feedback trigger is generated with a latency of $110\,\mathrm{ns}$ with respect to the timing of the analog input signal. We characterize the performance of the system for an active qubit initialization protocol based on dispersive readout of a superconducting qubit and discuss potential applications in feedback and feedforward algorithms.
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