Near-perfect sorting of orbital angular momentum and angular position states of light

Near-perfect sorting of orbital angular momentum and angular position states of light

We present a novel method for efficient sorting of photons prepared in states of orbital angular momentum (OAM) and angular position (ANG). A log-polar optical transform is used in combination with a holographic beam-splitting method to achieve better mode discrimination and reduced cross-talk than...

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Veröffentlicht in:Optics express 2012-10, Vol.20 (22), p.24444-24449
Hauptverfasser: O'Sullivan, Malcolm N, Mirhosseini, Mohammad, Malik, Mehul, Boyd, Robert W
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container_title Optics express
container_volume 20
creator O'Sullivan, Malcolm N
Mirhosseini, Mohammad
Malik, Mehul
Boyd, Robert W
description We present a novel method for efficient sorting of photons prepared in states of orbital angular momentum (OAM) and angular position (ANG). A log-polar optical transform is used in combination with a holographic beam-splitting method to achieve better mode discrimination and reduced cross-talk than reported previously. Simulating this method for 7 modes, we have calculated an improved mutual information of 2.43 bits/photon and 2.29 bits/photon for OAM and ANG modes respectively. In addition, we present preliminary results from an experimental implementation of this technique. This method is expected to have important applications for high-dimensional quantum key distribution systems.
doi_str_mv 10.1364/OE.20.024444
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title Near-perfect sorting of orbital angular momentum and angular position states of light
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