论文标题
与波导量子电动力学生成空间纠缠的巡回光子
Generating Spatially Entangled Itinerant Photons with Waveguide Quantum Electrodynamics
论文作者
论文摘要
实现完全连接的量子处理器网络需要分配量子纠缠的能力。对于远处的处理节点，这可以通过生成，路由和捕获空间纠缠的流动光子来实现。在这项工作中，我们使用直接耦合到波导的超导式转移量子台证明了此类光子的确定性生成。特别是，我们生成两光子N00N状态，并表明发射光子的状态和空间纠缠可通过量子频率调谐。使用正交振幅检测，我们重建光子模式的力矩和相关性，并显示了$ 84 \％$的状态准备忠诚度。我们的结果为使用量子干扰在波导量子量子构造中产生的巡回光子实现量子通信和传送方案提供了途径。
Realizing a fully connected network of quantum processors requires the ability to distribute quantum entanglement. For distant processing nodes, this can be achieved by generating, routing, and capturing spatially entangled itinerant photons. In this work, we demonstrate the deterministic generation of such photons using superconducting transmon qubits that are directly coupled to a waveguide. In particular, we generate two-photon N00N states and show that the state and spatial entanglement of the emitted photons are tunable via the qubit frequencies. Using quadrature amplitude detection, we reconstruct the moments and correlations of the photonic modes and demonstrate state preparation fidelities of $84\%$. Our results provide a path towards realizing quantum communication and teleportation protocols using itinerant photons generated by quantum interference within a waveguide quantum electrodynamics architecture.
