Near-Perfect Sorting of Orbital Angular Momentum and Angular Position States of Light
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TLDR
In this article, a novel method for efficient sorting of photons prepared in states of orbital angular momentum (OAM) and angular position (ANG) was presented, where a log-polar optical transform is used in combination with a holographic beam-splitting method to achieve better mode discrimination and reduced cross-talk.Abstract:
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.read more
Citations
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Journal ArticleDOI
Efficient separation of the orbital angular momentum eigenstates of light
Mohammad Mirhosseini,Mehul Malik,Mehul Malik,Zhimin Shi,Zhimin Shi,Robert W. Boyd,Robert W. Boyd +6 more
TL;DR: In this article, Mirhosseini et al. demonstrate a scheme that is able to separate photons with different orbital angular angular momentum with 92% efficiency, which has the potential to increase data rates and enhance security in quantum optical communications.
Journal ArticleDOI
Capacity limits of spatially multiplexed free-space communication
TL;DR: In this article, the capacity limits of the orbital angular momentum multiplexing for free-space optical communication were revealed, and it was shown that it is not an optimal technique for realizing the capacity limit of a free space communication channel.
Journal ArticleDOI
Direct measurement of a 27-dimensional orbital-angular-momentum state vector
Mehul Malik,Mohammad Mirhosseini,Martin P. J. Lavery,Jonathan Leach,Miles J. Padgett,Robert W. Boyd +5 more
TL;DR: This work shows the practical direct measurement of a high-dimensional state vector in the discrete basis of orbital angular momentum and uses this method to directly observe the relationship between rotations of a state vector and the relative phase between its orbital-angular-momentum components.
Journal ArticleDOI
Rapid Generation of Light Beams Carrying Orbital Angular Momentum
Mohammad Mirhosseini,Omar S. Magaña-Loaiza,Changchen Chen,Brandon Rodenburg,Mehul Malik,Robert W. Boyd +5 more
TL;DR: This work reports a technique for encoding both amplitude and phase variations onto a laser beam using a single digital micro-mirror device (DMD), and generates Laguerre-Gaussian and vortex orbital-angular-momentum modes, along with modes in a set that is mutually unbiased with respect to the OAM basis.
Journal ArticleDOI
High-dimensional quantum gates using full-field spatial modes of photons
TL;DR: In this article, it is shown that it is possible to perform a broad variety of unitary operations at high quality by using only a few phase modulation planes, and experimentally implement several high-dimensional quantum gates for up to five-dimensional states encoded in the full field mode structure of photons.
References
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Journal ArticleDOI
Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes.
TL;DR: Laser light with a Laguerre-Gaussian amplitude distribution is found to have a well-defined orbital angular momentum and an astigmatic optical system may be used to transform a high-order LaguERre- Gaussian mode into aHigh-order Hermite-Gaussia mode reversibly.
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Quantum cryptography
TL;DR: A protocol for coin-tossing by exchange of quantum messages is presented, which is secure against traditional kinds of cheating, even by an opponent with unlimited computing power, but ironically can be subverted by use of a still subtler quantum phenomenon, the Einstein-Podolsky-Rosen paradox.
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Terabit free-space data transmission employing orbital angular momentum multiplexing
Jian Wang,Jian Wang,Jeng-Yuan Yang,Irfan Fazal,Nisar Ahmed,Yan Yan,Hao Huang,Yongxiong Ren,Yang Yue,S. Dolinar,Moshe Tur,Alan E. Willner +11 more
TL;DR: In this paper, the authors demonstrate the ability to multiplex and transfer data between twisted beams of light with different amounts of orbital angular momentum, which provides new opportunities for increasing the data capacity of free-space optical communications links.
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Orbital angular momentum: origins, behavior and applications
Alison M. Yao,Miles J. Padgett +1 more
TL;DR: In this paper, it was shown that if every polarization vector rotates, the light has spin; if the phase structure rotates and if a light has orbital angular momentum (OAM), the light can be many times greater than the spin.
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Free-space information transfer using light beams carrying orbital angular momentum
Graham M. Gibson,Johannes Courtial,Miles J. Padgett,Mikhail V. Vasnetsov,V. A. Pas’ko,Stephen M. Barnett,Sonja Franke-Arnold +6 more
TL;DR: The transfer of information encoded as orbital angular momentum states of a light beam is demonstrated, which is resistant to eavesdropping and 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.