scholarly journals The Limits of Effective Degrees of Freedom in UCA based Orbital Angular Momentum Multiplexed Communications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Zhipeng Li ◽  
Fengzhong Qu ◽  
Yan Wei ◽  
Guowei Yang ◽  
Wen Xu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Degrees Of Freedom

scholarly journals Effects of the Coupling between the Orbital Angular Momentum and the Temporal Degrees of Freedom in the Most Intense Ring of Ultrafast Vortices

2020 ◽  
Vol 10 (6) ◽  
pp. 1957 ◽  
Author(s):  
Miguel A. Porras
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Pulse Energy ◽  
Topological Charge ◽  
Degrees Of Freedom ◽  
Maximum Energy ◽  
Laser Source ◽  
Source Spectrum ◽  
Vortex Center ◽  
Peak Intensity

It has recently been shown that the temporal and the orbital angular momentum (OAM) degrees of freedom in ultrafast (few-cycle) vortices are coupled. This coupling manifests itself with different effects in different parts of the vortex, as has been shown for the ring surrounding the vortex where the pulse energy is maximum, and also in the immediate vicinity of the vortex center. However, in many applications, the ring of maximum energy is not of primary interest, but the one where the peak intensity of the pulse is maximum, which is particularly true in nonlinear optics applications such as experiments with ultrafast vortices that excite high harmonics and attosecond pulses that also carry OAM. In this paper, the effects of the OAM-temporal coupling on the ring of maximum pulse peak intensity, which do not always coincide with the ring of maximum pulse energy, are described. We find that there is an upper limit to the magnitude of the topological charge that an ultrafast vortex with a prescribed pulse shape in its most intense ring can carry, and vice versa, a lower limit to the pulse duration in the most intense ring for a given magnitude of the topological charge. These limits imply that, with a given laser source spectrum, the duration of the synthesized ultrafast vortex increases with the magnitude of the topological charge. Explicit analytical expressions are given for the ultrafast vortices that contain these OAM-temporal couplings effects, which may be of interest in various applications, in particular in the study of their propagation and interaction with matter.

Interaction-free generation of orbital angular momentum entanglement

2016 ◽  
Vol 30 (05) ◽  
pp. 1650006
Author(s):  
Yuanyuan Chen ◽  
Dong Jiang ◽  
Xuemei Gu ◽  
Ling Xie ◽  
Lijun Chen
Keyword(s):  
Angular Momentum ◽  
Numerical Analysis ◽  
Orbital Angular Momentum ◽  
Degrees Of Freedom ◽  
Quantum Communication ◽  
Superposition State ◽  
Multiple Degrees Of Freedom ◽  
Free Generation ◽  
Infinite Range ◽  
Interaction Free Measurement

Due to the infinite range of possibly achievable degrees of freedom, orbital angular momentum (OAM) can tremendously increase the capacity of communication system. Here, we propose a scheme to generate OAM entanglement by using interaction-free measurement (IFM). As the superposition state of the quantum absorption object is not changed after IFM, our scheme can be extended to multiparty easily. The numerical analysis results show that the fidelity of generated OAM entanglement can be arbitrarily close to unity. Besides, the implementation issues are also discussed to evaluate the feasibility in experiment. This OAM entanglement with multiple degrees of freedom will play a key role in distributed entanglement computing and efficient quantum communication.

Terabit-Scale Orbital Angular Momentum Mode Division Multiplexing in Fibers

Science ◽  
2013 ◽  
Vol 340 (6140) ◽  
pp. 1545-1548 ◽  
Author(s):  
Nenad Bozinovic ◽  
Yang Yue ◽  
Yongxiong Ren ◽  
Moshe Tur ◽  
Poul Kristensen ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Optical Fiber ◽  
Orbital Angular Momentum ◽  
Degrees Of Freedom ◽  
Nonlinear Effects ◽  
Data Traffic ◽  
Additional Degree ◽  
Mode Division Multiplexing ◽  
Spatial Modes ◽  
Momentum Mode

Internet data traffic capacity is rapidly reaching limits imposed by optical fiber nonlinear effects. Having almost exhausted available degrees of freedom to orthogonally multiplex data, the possibility is now being explored of using spatial modes of fibers to enhance data capacity. We demonstrate the viability of using the orbital angular momentum (OAM) of light to create orthogonal, spatially distinct streams of data-transmitting channels that are multiplexed in a single fiber. Over 1.1 kilometers of a specially designed optical fiber that minimizes mode coupling, we achieved 400-gigabits-per-second data transmission using four angular momentum modes at a single wavelength, and 1.6 terabits per second using two OAM modes over 10 wavelengths. These demonstrations suggest that OAM could provide an additional degree of freedom for data multiplexing in future fiber networks.

All-silicon metasurfaces for polarization multiplexed generation of terahertz photonic orbital angular momentum superposition states

2021 ◽  
Vol 9 (16) ◽  
pp. 5478-5485
Author(s):  
Jie Li ◽  
Guocui Wang ◽  
Chenglong Zheng ◽  
Jitao Li ◽  
Yue Yang ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Degrees Of Freedom ◽  
Engineering Application ◽  
Superposition State ◽  
Superposition States

The superposition state of photonic orbital angular momentum (OAM) has more degrees of freedom than pure photonic orbital angular momentum, with rich physical implications and engineering application possibilities.

scholarly journals Unlocking the future of optical security with metasurfaces

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Jaehyuck Jang ◽  
Trevon Badloe ◽  
Junsuk Rho
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Degrees Of Freedom ◽  
The Future ◽  
Optical Security And Encryption

AbstractThe complex degrees of freedom of light, such as amplitude, phase, polarization, and orbital angular momentum, make it a prime candidate for use in optical security and encryption. By exploiting the unique characteristics of metasurfaces, exciting new optical security platforms have been demonstrated.

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