Imaging inspired characterization of single photons carrying orbital angular momentum

• URL: http://arxiv.org/abs/2111.08402v1
• Date: Tue, 16 Nov 2021 12:00:58 GMT
• Title: Imaging inspired characterization of single photons carrying orbital angular momentum
• Authors: Vimlesh Kumar, Varun Sharma, Sandeep Singh, S. Chaitanya Kumar, Andrew Forbes, M. Ebrahim-Zadeh, G. K. Samanta
• Abstract summary: We report on an imaging-inspired measurement of orbital angular momentum (OAM) using only a simple tilted lens and an Intensified Charged Coupled Device (ICCD) camera. We demonstrate measurement of OAM orders as high as 14 in a heralded single-photon source and show, for the first time, the imaged self-interference of photons carrying OAM.
• Score: 2.5568439408223758
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report on an imaging-inspired measurement of orbital angular momentum (OAM) using only a simple tilted lens and an Intensified Charged Coupled Device (ICCD) camera, allowing us to monitor the propagation of OAM structured photons over distance, crucial for free-space quantum communication networks. We demonstrate measurement of OAM orders as high as 14 in a heralded single-photon source (HSPS) and show, for the first time, the imaged self-interference of photons carrying OAM in a modified Mach-Zehnder Interferometer (MZI). The described methods reveal both the charge and order of a photons OAM, and provide a proof of concept for the interference of a single OAM photon with itself. Using these tools, we are able to study the propagation characteristics of OAM photons over distance, important for estimating transport in free-space quantum links. By translating these classical tools into the quantum domain, we offer a robust and direct approach for the complete characterization of a twisted single-photon source, an important building block of a quantum network.

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