Journal
OPTICS EXPRESS
Volume 12, Issue 22, Pages 5448-5456Publisher
Optica Publishing Group
DOI: 10.1364/OPEX.12.005448
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Funding
- Engineering and Physical Sciences Research Council [GR/S03904/01, GR/S03898/01] Funding Source: researchfish
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We demonstrate the transfer of information encoded as orbital angular momentum (OAM) states of a light beam. The transmitter and receiver units are based on spatial light modulators, which prepare or measure a laser beam in one of eight pure OAM states. We show that the information encoded in this way is resistant to eavesdropping in the sense that any attempt to sample the beam away from its axis will be subject to an angular restriction and a lateral offset, both of which result in inherent uncertainty in the measurement. This gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAM measurement and demonstrates the uncertainty relationship for OAM. (C) 2004 Optical Society of America.
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