Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Grimaudo, R."'
The occurrence of a second-order superradiant quantum phase transition is brought to light in a quantum system consisting of two interacting qubits coupled to the same quantized field mode. We introduce an appropriate thermodynamic-like limit for the
Externí odkaz:
http://arxiv.org/abs/2310.19595
We consider spin-chain-star systems characterized by N-wise many-body interactions between the spins in each chain and the central one. We show that such systems can be exactly mapped into standard spin-star systems through unitary transformations. S
Externí odkaz:
http://arxiv.org/abs/2203.06711
Publikováno v:
Entropy 2020, 22(10), 1184
In contrast to classical systems, actual implementation of non-Hermitian Hamiltonian dynamics for quantum systems is a challenge because the processes of energy gain and dissipation are based on the underlying Hermitian system-environment dynamics th
Externí odkaz:
http://arxiv.org/abs/2009.10004
A system of a quantum harmonic oscillator bi-linearly coupled with a Glauber amplifier is analysed considering a time-dependent Hamiltonian model. The Hilbert space of this system may be exactly subdivided into invariant finite dimensional subspaces.
Externí odkaz:
http://arxiv.org/abs/1910.02703
Publikováno v:
Phys. Rev. A 99, 052103 (2019)
A protocol for explicitly constructing the exact time-evolution operators generated by $2 \times 2$ time-dependent $PT$-symmetry Hamiltonians is reported. Its mathematical applicability is illustrated with the help of appropriate examples. The physic
Externí odkaz:
http://arxiv.org/abs/1903.04402
Publikováno v:
Phys. Rev. B 99, 214406 (2019)
A time-dependent two interacting spin-qutrit model is analysed and solved. The two interacting qutrits are subjected to a longitudinal field linearly varying over time as in the Landau-Majorana-St\"uckelberg-Zener (LMSZ) scenario. Although a transver
Externí odkaz:
http://arxiv.org/abs/1901.00322
Publikováno v:
Phys. Rev. B 99, 174416 (2019)
We analyse a system of two interacting spin-qubits subjected to a Landau-Majorana-St\"uckelberg-Zener (LMSZ) ramp. We prove that LMSZ transitions of the two spin-qubits are possible without an external transverse static field since its role is played
Externí odkaz:
http://arxiv.org/abs/1812.06506
Publikováno v:
Phys. Rev. A 98, 042330 (2018)
We propose a model describing $N$ spin-1/2 systems coupled through $N$-order homogeneous interaction terms, in presence of local time-dependent magnetic fields. This model can be experimentally implemented with current technologies in trapped ions an
Externí odkaz:
http://arxiv.org/abs/1807.11285
Publikováno v:
Phys. Rev. A 98, 033835 (2018)
An exact analytical treatment of the dynamical problem for time-dependent 2x2 pseudo-hermitian su(1,1) Hamiltonians is reported. A class of exactly solvable and physically transparent new scenarios are identified within both classical and quantum con
Externí odkaz:
http://arxiv.org/abs/1806.02103
Publikováno v:
Annalen der Physik 2018, 1800198
The exact quantum dynamics of a single spin-1/2 in a generic time-dependent classical magnetic field is investigated and compared with the quantum motion of a spin-1/2 studied by Rabi and Schwinger. The possibility of regarding the scenario studied i
Externí odkaz:
http://arxiv.org/abs/1803.02086