论文标题
波导QED系统中的确定性光子分选
Deterministic Photon Sorting in Waveguide QED Systems
论文作者
论文摘要
将量子场根据其Fock空间量子数分为不同的模式是非常可取的量子操作。在这封信中，我们表明，一对两级发射器与波导耦合，可能会将输入脉冲的单个和两光子组件散布到具有忠诚度$ \ gtrsim 0.9999 $的正交时间模式中。我们开发了一种一般理论来表征和优化这一过程，并观察到两光子散射状态中的有趣动态：虽然第一个发射极引起了复杂的多模场，但第二发射极重组了场振幅，并且净两光片散射会诱发脉搏模式的自我时间逆转。提出的方案可用于构建用于传播光子的逻辑元素，例如具有忠诚度$ \ gtrsim 0.9995 $的确定性非线性符号门
Sorting quantum fields into different modes according to their Fock-space quantum numbers is a highly desirable quantum operation. In this Letter, we show that a pair of two-level emitters, chirally coupled to a waveguide, may scatter single- and two-photon components of an input pulse into orthogonal temporal modes with a fidelity $\gtrsim 0.9997$. We develop a general theory to characterize and optimize this process and observe an interesting dynamics in the two-photon scattering regime: while the first emitter gives rise to a complex multimode field, the second emitter recombines the field amplitudes and the net two-photon scattering induces a self-time reversal of the pulse mode. The presented scheme can be employed to construct logic elements for propagating photons, such as a deterministic nonlinear-sign gate with a fidelity $\gtrsim 0.9995$
