论文标题
波导QED中的量子控制方向边缘状态
Qubit-controlled directional edge states in waveguide QED
论文作者
论文摘要
我们提出了一个可原位可调节的手性量子系统，该系统由基于稻米模型的量子发射极组成（在波导阵列中的位点之间，我们都可以在现场电位和隧道耦合上耦合到波导）。具体而言，我们表明，在波导的带隙中出现的光子结合状态的手性仅取决于量子的能量。在许多人造原子中易于调整的参数。与以前表现出不完善的手性或固定方向性的提议相反，我们的波导QED方案既可以达到完美的手性，又可以使用设备中的一个可调元素切换方向性。我们还表明，在最先进的超导电路和量子点体系结构中，我们的模型易于实现。结果表明，在保持零串扰的同时，在量子位之间创建远程耦合器方面有希望。
We propose an in-situ tunable chiral quantum system, composed of a quantum emitter coupled to a waveguide based on the Rice-Mele model (where we alternate both the on-site potentials and tunnel couplings between sites in the waveguide array). Specifically, we show that the chirality of photonic bound state, that emerges in the bandgap of the waveguide, depends only on the energy of the qubit; a parameter that is easy to tune in many artificial atoms. In contrast to previous proposals that have either shown imperfect chirality or fixed directionality, our waveguide QED scheme achieves both perfect chirality and the capability to switch the directionality on demand with just one tunable element in the device. We also show that our model is easy to implement in both state-of-the-art superconducting circuit and quantum dot architectures. The results show technological promise in creating long-range couplers between qubits while maintaining, in principle, zero crosstalk.
