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. 2018 Mar 9;7:17156. doi: 10.1038/lsa.2017.156

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Copyright © 2018 The Author(s)

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Quantum operation. (a) The experimental setup based on spontaneous parametric downconversion (SPDC). (b) Modulating light with the required phase profiles in a reflective SLM. (c) Quantum spiral spectrum of the generated vortex beam. (d) Quantum coincidences between a vortex beam with q_A in the signal beam and that with q_B in the idler beam. Inset: Line-scan simulated coincidence as a function of q_A when q_B=0. (e) The experimental and simulated width w as a function of q_B. (f) Quantum coincidences between our vortex beams with discrete q_A and q_B (=0, ±1, ±2, ±3). (g) The cross-talk of the quantum coincidences for the different state intervals of 1, 2 and 3.