Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Kloc, Michal"'
Publikováno v:
Phys. Rev. Applied 16, 044061 (2021)
We show that the lower levels of a large-spin network with a collective anti-ferromagnetic interaction and collective couplings to three reservoirs may function as a quantum absorption refrigerator. In appropriate regimes, the steady-state cooling cu
Externí odkaz:
http://arxiv.org/abs/2106.04164
Publikováno v:
Mach. Learn.: Sci. Technol. 2, 035004 (2021)
Control of the stochastic dynamics of a quantum system is indispensable in fields such as quantum information processing and metrology. However, there is no general ready-made approach to the design of efficient control strategies. Here, we propose a
Externí odkaz:
http://arxiv.org/abs/2101.01190
Publikováno v:
J. Phys. A: Math. Theor. 54, 133001 (2021)
We review the effects of excited-state quantum phase transitions (ESQPTs) in interacting many-body systems with finite numbers of collective degrees of freedom. We classify typical ESQPT signatures in the spectra of energy eigenstates with respect to
Externí odkaz:
http://arxiv.org/abs/2011.01662
Autor:
Kloc, Michal, Šimsa, Daniel, Hanák, Filip, Kaprálová-Žďánská, Petra Ruth, Stránský, Pavel, Cejnar, Pavel
Publikováno v:
Phys. Rev. A 103, 032213 (2021)
The dynamics of a quantum system following a sudden, highly non-adiabatic change of its control parameter (quantum quench) is studied with quasiclassical techniques. Recent works have shown, using exact quantum mechanical approach, that equilibration
Externí odkaz:
http://arxiv.org/abs/2010.07750
Publikováno v:
Mach. Learn.: Sci. Technol. 1, 035009 (2020)
Optimal control is highly desirable in many current quantum systems, especially to realize tasks in quantum information processing. We introduce a method based on differentiable programming to leverage explicit knowledge of the differential equations
Externí odkaz:
http://arxiv.org/abs/2002.08376
Publikováno v:
Phys. Rev. Lett. 125, 020401 (2020)
We introduce a complex-extended continuum level density and apply it to one-dimensional scattering problems involving tunneling through finite-range potentials. We show that the real part of the density is proportional to a real "time shift" of the t
Externí odkaz:
http://arxiv.org/abs/2002.03874
Autor:
Kloc, Michal
In the thesis we investigate and classify critical phenomena in the extended Dicke model (EDM) which describes the interaction between two-level atoms and a single-mode bosonic field (schematic model for cavity quantum electrodynamics). The model bel
Externí odkaz:
http://www.nusl.cz/ntk/nusl-388533
Publikováno v:
Phys. Rev. E 100, 042126 (2019)
We study the finite-time effects in a quantum Otto cycle where a collective spin system is used as the working fluid. Starting from a simple one-qubit system we analyze the transition to the limit cycle in the case of a finite-time thermalization. If
Externí odkaz:
http://arxiv.org/abs/1905.08692
Publikováno v:
Phys. Rev. A 98, 013836 (2018)
We study the quantum quench dynamics in an extended version of the Dicke model where an additional parameter allows a smooth transition to the integrable Tavis-Cummings regime. We focus on the influence of various quantum phases and excited-state qua
Externí odkaz:
http://arxiv.org/abs/1805.06285
We study the focus-focus type of monodromy in an integrable version of the Dicke model. Classical orbits forming a pinched torus represent analogues of the dynamic superradiance under conditions of a closed system. Quantum signatures of monodromy app
Externí odkaz:
http://arxiv.org/abs/1702.07224