We propose an architecture for achieving high-fidelity deterministic quantum logic gates on dual-rail encoded photonic qubits by letting photons interact with a two-level emitter (TLE) inside an optical cavity. The photon wave packets that define the qubit are preserved after the interaction due to a quantum control process that actively loads and unloads the photons from the cavity and dynamically alters their effective coupling to the TLE. The controls rely on nonlinear wave mixing between cavity modes enhanced by strong externally modulated electromagnetic fields or on AC Stark shifts of the TLE transition energy. We numerically investigate the effect of imperfections in terms of loss and dephasing of the TLE as well as control field miscalibration. Our results suggest that III-V quantum dots in GaAs membranes is a promising platform for photonic quantum information processing.

我们提出了一种架构，通过让光子与光学腔内的两级发射器 (TLE) 相互作用，在双轨编码光子量子比特上实现高保真确定性量子逻辑门。由于量子控制过程主动加载和卸载腔中的光子并动态改变它们与 TLE 的有效耦合，定义量子比特的光子波包在相互作用后得以保留。控制依赖于由强外部调制电磁场增强的腔模式之间的非线性波混合，或者依赖于 TLE 跃迁能量的 AC Stark 位移。我们在 TLE 的损失和移相以及控制场误校准方面对缺陷的影响进行了数值研究。