We consider a class of games between two competing players that take turns acting on the same many-body quantum register. Each player can perform unitary operations on the register, and after each one of them acts on ...
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We consider a class of games between two competing players that take turns acting on the same many-body quantum register. Each player can perform unitary operations on the register, and after each one of them acts on the register the energy is measured. Player A aims to maximize the energy while player B to minimize it. This class of zero-sum games has a clear second mover advantage if both players can entangle the same portion of the register. We show, however, that if the first player can entangle a larger number of qubits than the second player (which we refer to as having quantum edge), then the second mover advantage can be significantly reduced. We study the game for different types of quantum edge of player A versus player B and for different sizes of the register, in particular, scenarios in which absolutely maximally entangled states cannot be achieved. In this case, we also study the effectiveness of using random unitaries. Last, we consider mixed initial preparations of the register, in which case the player with a quantum edge can rely on strategies stemming from the theory of ergotropy of quantum batteries.
Signals are crucial in conveying information across various fields. This paper presents new methods for processing electromyographic (EMG) signals to create AI systems that decode muscle activity for arm movement cont...
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ISBN:
(数字)9798350350821
ISBN:
(纸本)9798350350838
Signals are crucial in conveying information across various fields. This paper presents new methods for processing electromyographic (EMG) signals to create AI systems that decode muscle activity for arm movement control. Using an advanced dataset, the study focuses on enhancing prosthetic control and rehabilitation technologies through sophisticated signal processing and machine learning techniques. Various preprocessing steps improved signal quality, and a diverse set of features was extracted and classified. The results highlight the potential for more intuitive and responsive robotic arm movements, contributing to better prosthetic and rehabilitation solutions.
The discarded section of an orange fruit, orange peel waste (OPW), is well-recognised as a rich source of vitamins and nutrients that can be turned into high-value-added food products. OPW is produced in millions of t...
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In this work,the thermodynamic,mechanical properties and electronic behaviors of D022-TiAl3 doped with W and 15 groupⅣM(M=C,Ge,Pb,Si and Sn)dopants are investigated by DFT *** established that ductility can be improv...
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In this work,the thermodynamic,mechanical properties and electronic behaviors of D022-TiAl3 doped with W and 15 groupⅣM(M=C,Ge,Pb,Si and Sn)dopants are investigated by DFT *** established that ductility can be improved using multi-doping approach and revealed the mechanisms behind such brittle-to-ductile *** addition,it is found that there is linearity between changes in Young’s modulus and tensile/compre s sive strain *** alternate insight into brittle-to-ductile transition during ductile mode cutting of brittle materials is proposed.
The discarded section of an orange fruit, orange peel waste (OPW), is well-recognised as a rich source of vitamins and nutrients that can be turned into high-value-added food products. OPW is produced in millions of t...
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‘Circular economy’ and ‘zero waste economy’ are not just 21st century terms but are increasingly becoming part of mainstream narrative to lead an ethical and environmentally conscious life which benefits not just ...
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‘3D food printing technology is a rapidly advancing technology offering customization in nutrition, shape, taste and texture. Popular foods can be created in exciting and visually appealing forms through 3DFP. In thi...
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We consider a bosonic two-legged ladder whose two-band energy spectrum can be tuned in the presence of a uniform gauge field, to four distinct scenarios: degenerate or nondegenerate ground states with gapped or gaples...
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We consider a bosonic two-legged ladder whose two-band energy spectrum can be tuned in the presence of a uniform gauge field, to four distinct scenarios: degenerate or nondegenerate ground states with gapped or gapless energy bands. We couple the ladder to two baths at different temperatures and chemical potentials and analyze the efficiency and power generated in the linear as well as nonlinear response regime. Our results, obtained with the Green's function method, show that the maximum performance efficiency and generated power are strongly dependent on the type of the underlying energy spectrum. We also show that the ideal scenario for efficient energy conversion, as well as power generation, corresponds to the case in which the spectrum has a gap between the bands, and the ground state is degenerate.
The Hubbard and Su-Schrieffer-Heeger (SSH) Hamiltonians are iconic models for understanding the qualitative effects of electron-electron and electron-phonon interactions, respectively. In the two-dimensional square la...
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The Hubbard and Su-Schrieffer-Heeger (SSH) Hamiltonians are iconic models for understanding the qualitative effects of electron-electron and electron-phonon interactions, respectively. In the two-dimensional square lattice Hubbard model at half filling, the on-site Coulomb repulsion U between up and down electrons induces antiferromagnetic (AFM) order and a Mott insulating phase. On the other hand, for the SSH model, there is an AFM phase when the electron-phonon coupling λ is less than a critical value λc and a bond order wave when λ>λc. In this Letter, we perform numerical studies on the square lattice optical Su-Schrieffer-Heeger-Hubbard Hamiltonian, which combines both interactions. We use the determinant quantum Monte Carlo method which does not suffer from the fermionic sign problem at half filling. We map out the phase diagram and find that it exhibits a direct first-order transition between an antiferromagnetic phase and a bond-ordered wave as λ increases. The AFM phase is characterized by two different regions. At smaller λ the behavior is similar to that of the pure Hubbard model; the other region, while maintaining long-range AFM order, exhibits larger kinetic energies and double occupancy, i.e., larger quantum fluctuations, similar to the AFM phase found in the pure SSH model.
Balachandran et al. [Phys. Rev. Lett. 120, 200603 (2018)] presented a segmented XXZ spin chain with zero anisotropy in one half and a large anisotropy on the other half that gave rise to a spin current rectification w...
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Balachandran et al. [Phys. Rev. Lett. 120, 200603 (2018)] presented a segmented XXZ spin chain with zero anisotropy in one half and a large anisotropy on the other half that gave rise to a spin current rectification which is perfect in the thermodynamic limit. Here we extend the previous study to segmented chains with interacting integrable as well as nonintegrable halves, considering even cases in which no ballistic transport can emerge in either half. We demonstrate that, also in this more general case, it is possible to obtain giant rectification when the two interacting half chains are sufficiently different. We also show that the mechanism causing this effect is the emergence of an energy gap in the excitation spectrum of the out-of-equilibrium insulating steady state in one of the two biases. Finally, we demonstrate that in the thermodynamic limit there is no perfect rectification when each of the two half chains is interacting.
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