Sorting quantum systems efficiently
arXiv:1512.01541 · doi:10.1038/srep25356
Abstract
Measuring the state of a quantum system is a fundamental process in quantum mechanics and plays an essential role in quantum information and quantum technologies. One method to measure a quantum observable is to sort the system in different spatial modes according to the measured value, followed by single-particle detectors on each mode. Examples of quantum sorters are polarizing beam-splitters (PBS) -- which direct photons according to their polarization -- and Stern-Gerlach devices. Here we propose a general scheme to sort a quantum system according to the value of any -dimensional degree of freedom, such as spin, orbital angular momentum (OAM), wavelength etc. Our scheme is universal, works at the single-particle level and has a theoretical efficiency of 100\%. As an application we design an efficient OAM sorter consisting of a single multi-path interferometer which is suitable for a photonic chip implementation.
Updated to the published version
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- Cyclic permutations for qudits in dimensions
- High-dimensional quantum Fourier transform of twisted light
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- Simultaneous sorting many quDits using different input ports
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- Entangled ripples and twists of light: Radial and azimuthal Laguerre-Gaussian mode entanglement