Aligning Spatial Frames Through Quantum Channels

构建与对准一台10平面光转换器

Building and aligning a 10-plane light converter

本文给出利用单个SLM和标准光学元件构建、对准10平面可编程MPLC转换器的分步教程，并以简单装置实现单像素对准精度。

Aligning Reference Frames Using Quantum States

We analyze the problem of sending, in a single transmission, the information required to specify an orthogonal trihedron or reference frame through a quantum channel made out of N elementary spins. We analytically obtain the optimal strategy, i.e., the best encoding state and the best measurement. For large N, we show that the average error goes to zero linearly in 1/N. Finally, we discus the construction of finite optimal measurements.

On the communication complexity of establishing a shared reference frame

We discuss the communication complexity of establishing a shared reference frame, in particular examining the case of aligning spatial axes via the exchange of spin-1/2 particles. Unlike previous work we allow for multiple rounds of communication, and we give several simple examples demonstrating that nontrivial tradeoffs between the number of rounds and the type of communication required exist. We then give an explicit protocol for aligning spatial axes via the exchange of spin-1/2 particles which makes no use of either exchanged entangled states or of joint measurements. Rather it works by p…