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We show that tailoring the dissipative environment allows to change the features of continuous quantum phase transitions and, even, induce first order transitions in ferromagnetic spin chains. In particular, using a numerically exact quantum Monte Ca
Externí odkaz:
http://arxiv.org/abs/2207.13782
Autor:
De Filippis, G., de Candia, A., Di Bello, G., Perroni, C. A., Cangemi, L. M., Nocera, A., Sassetti, M., Fazio, R., Cataudella, V.
By using worldline Monte Carlo technique, matrix product state and a variational approach \`a la Feynman, we investigate the equilibrium properties and relaxation features of the dissipative quantum Rabi model, where a two level system is coupled to
Externí odkaz:
http://arxiv.org/abs/2205.11555
Autor:
De Filippis, G., de Candia, A., Mishchenko, A. S., Cangemi, L. M., Nocera, A., Mishchenko, P. A., Sassetti, M., Fazio, R., Nagaosa, N., Cataudella, V.
Publikováno v:
Phys. Rev. B 104, 060410 (2021)
By using worldline and diagrammatic quantum Monte Carlo techniques, matrix product state and a variational approach \`a la Feynman, we investigate the equilibrium properties and relaxation features of a quantum system of $N$ spins antiferromagnetical
Externí odkaz:
http://arxiv.org/abs/2103.16222
The effectiveness of the variational approach a la Feynman is proved in the spin-boson model, i.e. the simplest realization of the Caldeira-Leggett model able to reveal the quantum phase transition from delocalized to localized states and the quantum
Externí odkaz:
http://arxiv.org/abs/1912.13448
We present a method to measure the von Neumann entanglement entropy of ground states of quantum many-body systems which does not require access to the system wave function. The technique is based on a direct thermodynamic study of entanglement Hamilt
Externí odkaz:
http://arxiv.org/abs/1904.07782
Publikováno v:
Phys. Rev. Lett. 125, 163603 (2020)
It is commonly accepted that a parametric amplifier can simulate a phase-preserving linear amplifier regardless of how the latter is realized [Caves et al., Phys. Rev. A 86, 063802 (2012)]. If true, this reduces all phase-preserving linear amplifiers
Externí odkaz:
http://arxiv.org/abs/1903.09370
Publikováno v:
PRA 90, 063638 (2014)
We propose a simple method to simulate and detect topological insulators with cold atoms trapped in a one-dimensional bichromatic optical lattice subjected to a time-periodic modulation. The tight-binding form of this shaken system is equivalent to t
Externí odkaz:
http://arxiv.org/abs/1902.08338
Akademický článek
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Publikováno v:
Quantum 3, 200 (2019)
The phase of an optical field inside a linear amplifier is widely known to diffuse with a diffusion coefficient that is inversely proportional to the photon number. The same process occurs in lasers which limits its intrinsic linewidth and makes the
Externí odkaz:
http://arxiv.org/abs/1811.08105