Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Merkli, Marco"'
Autor:
Marcantoni, Stefano, Merkli, Marco
We study the dynamics of an open quantum system linearly coupled to a bosonic reservoir. We show that, in the ultrastrong coupling limit, the system undergoes a nonselective measurement and then evolves unitarily according to an effective Zeno Hamilt
Externí odkaz:
http://arxiv.org/abs/2411.06817
Autor:
Fantechi, Michele, Merkli, Marco
We show that when a quantum system is coupled to an environment in a mean field way, then its effective dynamics is governed by a unitary group with a time-dependent Hamiltonian. The time-dependent modification of the bare system Hamiltonian is given
Externí odkaz:
http://arxiv.org/abs/2409.15850
Thermalization of isolated and open quantum systems has been studied extensively. However, being the subject of investigation by different scientific communities and being analysed using different mathematical tools, the connection between the isolat
Externí odkaz:
http://arxiv.org/abs/2409.11932
A spin (qubit) is in contact with a bosonic reservoir. The state of the reservoir contains a parameter {\varepsilon} interpolating between quantum and classical reservoir features. We derive the explicit expression for the time-dependent reduced spin
Externí odkaz:
http://arxiv.org/abs/2408.02515
Publikováno v:
Quantum 8, 1360 (2024)
Rigorous derivations of the approach of individual elements of large isolated systems to a state of thermal equilibrium, starting from arbitrary initial states, are exceedingly rare. This is particularly true for quantum mechanical systems. We demons
Externí odkaz:
http://arxiv.org/abs/2312.14290
Autor:
Joye, Alain, Merkli, Marco
We consider a slowly varying time dependent d-level atom interacting with a photon field. Restricted to the single excitation atom-field sector, the model is a time-dependent generalization of the Wigner-Weisskopf model describing spontaneous emissio
Externí odkaz:
http://arxiv.org/abs/2210.15725
In this short note we study Spin-Boson Models from the Quasi-Classical standpoint. In the Quasi-Classical limit, the field becomes macroscopic while the particles it interacts with, they remain quantum. As a result, the field becomes a classical envi
Externí odkaz:
http://arxiv.org/abs/2209.06477
We consider a quantum oscillator coupled to a bath of $N$ other oscillators. The total system evolves with a quasi-Hermitian Hamiltonian. Associated to it is a family of Hermitian systems, parameterized by a unitary map $W$. Our main goal is to find
Externí odkaz:
http://arxiv.org/abs/2206.01711
Autor:
Merkli, Marco
A finite quantum system S is coupled to a thermal, bosonic reservoir R. Initial SR states are possibly correlated, obtained by applying a quantum operation taken from a large class, to the uncoupled equilibrium state. We show that the full system-res
Externí odkaz:
http://arxiv.org/abs/2107.02515
Autor:
Merkli, Marco
Publikováno v:
Quantum 6, 616 (2022)
A finite-dimensional quantum system is coupled to a bath of oscillators in thermal equilibrium at temperature $T>0$. We show that for fixed, small values of the coupling constant $\lambda$, the true reduced dynamics of the system is approximated by t
Externí odkaz:
http://arxiv.org/abs/2105.00023