We present a novel scheme of cyclic remote state preparation via a six-qubit entangled state as the quantum channel. By introducing three auxiliary particles and using feedforward measurement strategy, Alice can remotely prepare an arbitrary single-qubit quantum state for Bob, Bob can remotely prepare an arbitrary single-qubit quantum state on Charlie’s site and Charlie can also remotely prepare an arbitrary single-qubit quantum state for Alice. It is pointed out that the cyclic remote preparation in the opposite direction can be perfectly achieved by changing the quantum channel. Furthermore, we generalize the above scheme to systems having N observers, so that cyclic remote state preparation can be realized in quantum information networks with N observers in different directions by changing quantum channels.

我们提出了一种通过六量子位纠缠态作为量子通道的循环远程状态准备的新方案。通过引入三个辅助粒子并使用前馈测量策略，爱丽丝可以为鲍勃远程准备任意单量子位量子态，鲍勃可以在查理站点上远程准备任意单量子位量子态，而查理也可以远程准备任意单量子位态爱丽丝的量子态。要指出的是，通过改变量子通道，可以完美地实现相反方向的周期性遥测。此外，我们概括上述方案具有系统Ñ观察员，使得环状远程状态制剂可以与量子信息网络实现Ñ 通过改变量子通道在不同方向上的观察者。