Journal
PHYSICAL REVIEW A
Volume 81, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.81.043844
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Funding
- United Kingdom Engineering and Physical Sciences Research Council
- European Commission [FP7-ICT-221906]
- Hamamatsu
- EPSRC [EP/G011567/1, EP/G011656/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G011656/1, EP/G011567/1] Funding Source: researchfish
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We use spatial light modulators (SLMs) to measure correlations between arbitrary superpositions of orbital angular momentum (OAM) states generated by spontaneous parametric down-conversion. Our technique allows us to fully access a two-dimensional OAM subspace described by a Bloch sphere, within the higher-dimensional OAM Hilbert space. We quantify the entanglement through violations of a Bell-type inequality for pairs of modal superpositions that lie on equatorial, polar, and arbitrary great circles of the Bloch sphere. Our work shows that SLMs can be used to measure arbitrary spatial states with a fidelity sufficient for appropriate quantum information processing systems.
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