Photons carrying orbital angular momentum (OAM) are excellent qudits and are widely used in several applications, such as long distance quantum communication, d -dimensional teleportation and high-resolution imaging and metrology. All these protocols rely on quantum tomography to characterise the OAM state, which currently requires complex measurements involving spatial light modulators and mode filters. To simplify the measurement and characterisation of OAM states, here we apply a recent tomography protocol [Asadian et al , Phys. Rev. A 94 010301 (2016)]. Our scheme for OAM tomography in d dimensions requires only a set of measurements on a path qubit, i.e., a two-dimensional system. This replaces the current complexity of OAM measurements by the ability to perform generalized Pauli operators X d , Z d on OAM states. Our scheme can be adapted in principle to other degrees of freedom, thus opening th...

中文翻译：

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海森堡-魏尔观测站的OAM层析成像

携带轨道角动量（OAM）的光子非常出色，并且已广泛用于多种应用中，例如长距离量子通信，d维隐形传态以及高分辨率成像和计量学。所有这些协议都依赖于量子层析成像来表征OAM状态，而OAM状态目前需要复杂的测量，包括空间光调制器和模式滤波器。为了简化OAM状态的测量和表征，在这里我们应用了最新的层析成像协议[Asadian等，Phys。Rev.A 94 010301（2016）]。我们的d维OAM层析成像方案仅需要对路径量子位（即二维系统）进行一组测量。这通过在OAM状态上执行广义Pauli运算符X d，Z d的能力代替了OAM测量的当前复杂性。