Implementation of one-dimensional quantum walks on spin-orbital angular momentum space of photons

Details Implementation of one-dimensional quantum walks on spin-orbital angular momentum space of photons Implementation of one-dimensional quantum walks on spin-orbital angular momentum space of photons

2010-02-03

arxiv.org/abs/1002.0638v1

Phys. Rev A 81, 052322 (2010)

Physics

Quantum Physics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevA.81.052322

Photons can carry spin angular momentum (SAM) and orbital angular momentum (OAM), which can be used to realize a qubit system and a high-dimension system respectively. This spin-orbital system is very suitable for implementing one-dimensional discrete-time quantum random walks. We propose a simple scheme of quantum walks on the spin-orbital angular momentum space of photons, where photons walk on the infinity OAM space controlled by their SAM. By employing the recent invention of an optical device, the so-called 'q-plate', our scheme is more simple and efficient than others because there is no Mach-Zehnder interferometer in the scheme.

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