Stevedoring knot. Travel Tips

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Stevedoring knot. Travel Tips

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Like eight, stevedoring unit is a stopper for the cables passing through the pulleys of the blocks. It is knitted in the same way, but with the only difference that the running end is inserted into the loop after it has been wrapped around the root end of the cable twice.

When tightening this knot, make sure that the hoses at the root end do not twist and slip into the loop. A tightened stevedoring knot is easier to untie if you pull on the loop that is closer to the root end.

Rice. 4. Stevedoring unit

Author: Skryagin L.N.

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Protocol for designing multidimensional states 23.12.2021

The inevitable presence of noise and shortcomings in the characteristics of experimental devices reduce the overall quality of generation of multidimensional states. To overcome these limitations, a team of researchers from Sapienza University of Rome, Queen's University of Belfast and the University of Palermo used an adaptive optimization protocol capable of generating arbitrary multidimensional states.

The adaptive optimization protocol constructs arbitrary multidimensional states for solving quantum information problems that require finding optimal values of experimental parameters in noisy conditions.

The creation of multidimensional quantum states in quantum information protocols provides better performance in applications ranging from secure quantum communication to fault-tolerant quantum computing. A significant achievement would be the development of universal protocols capable of constructing arbitrary multidimensional quantum states. To this end, several strategies and platforms have been proposed and developed.

Under a completely black box scenario, the protocol proposed by scientists at Sapienza University tunes the appropriate experimental parameters, relying only on the measured match between the produced and target state, without the need to describe the generation setup.

Scheme of an automated platform for constructing arbitrary qudit states from the orbital angular momentum of photons. Experiment parameters are adaptively optimized to generate target states.

The scientists experimentally tested the protocol using the orbital angular momentum (OAM) of classical light and single photons. OAM is the degree of freedom of an electromagnetic field associated with its spatial and phase profile. Because OUM is an infinite-dimensional degree of freedom, it is suitable for encoding arbitrary multidimensional quantum states. The authors experimentally implemented the protocol using a state generation platform based on the dynamics of quantum walk in OAM and polarization degrees of freedom. By adjusting the parameters of the operators acting on the polarization state, it is possible to design an arbitrary pedestrian state encoded in OAM space. The proposed optimization algorithm then performs an online tuning of the experimental parameters that govern the dynamics to obtain the desired result.

The optimization protocol has been shown to perform well under noisy experimental conditions for several XNUMXD target states of the OUM. Finally, the team explored the adaptability of the protocol by introducing time-varying noise as an external influence on parameter values. The protocol found a new optimal solution after introducing these external perturbations. The proposed protocol is applicable in a wide variety of circumstances, even in the presence of interference, without the need for significant fine-tuning.

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