Tailoring the interactions between quantum emitters and single photonsconstitutes one of the cornerstones of quantum optics. Coupling a quantumemitter to the band edge of a photonic crystal waveguide (PCW) provides aunique platform for tuning these interactions. In particular, the crossoverfrom propagating fields $E(x) \propto e^{\pm ik_x x}$ outside the bandgap tolocalized fields $E(x) \propto e^{-\kappa_x |x|}$ within the bandgap should beaccompanied by a transition from largely dissipative atom-atom interactions toa regime where dispersive atom-atom interactions are dominant. Here, weexperimentally observe this transition for the first time by shifting the bandedge frequency of the PCW relative to the $\rm D_1$ line of atomic cesium for$\bar{N}=3.0\pm 0.5$ atoms trapped along the PCW. Our results are the initialdemonstration of this new paradigm for coherent atom-atom interactions with lowdissipation into the guided mode.
展开▼
机译：量身定制量子发射器和单光子之间的相互作用是量子光学的基石之一。将量子发射极耦合到光子晶体波导（PCW）的带边缘，为调节这些相互作用提供了独特的平台。特别是，从带隙外的传播字段$ E（x）\ propto e ^ {\ pm ik_x x} $到带隙内的本地化字段$ E（x）\ propto e ^ {-\ kappa_x | x |} $的交叉应该伴随着从大量耗散的原子与原子的相互作用向以分散的原子与原子的相互作用占主导地位的体系的过渡。在这里，我们通过相对于沿PCW捕获的$ \ bar {N} = 3.0 \ pm 0.5 $原子的原子铯的$ \ rm D_1 $线移动PCW的带边频率，来首次观察到这种转变。我们的结果是这种新的范例的初次演示，该范例对于相干原子-原子的相互作用具有低耗散到导引模式。
展开▼
