Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Gietka, Karol"'
Due to the inherently probabilistic nature of quantum mechanics, each experimental realization of a dynamical quantum system may yield a different measurement outcome, especially when the system is coupled to an environment that causes dissipation. A
Externí odkaz:
http://arxiv.org/abs/2410.11542
Critical quantum metrology relies on the extreme sensitivity of a system's eigenstates near the critical point of a quantum phase transition to Hamiltonian perturbations. This means that these eigenstates are extremely sensitive to all the parameters
Externí odkaz:
http://arxiv.org/abs/2407.19917
Publikováno v:
Phys. Rev. B 110, L100303 (2024)
Driven-dissipative light-matter systems can exhibit collective nonequilibrium phenomena due to loss and gain processes on the one hand and effective photon-photon interactions on the other hand. As generic example we study a bosonic lattice system im
Externí odkaz:
http://arxiv.org/abs/2404.18647
Autor:
Gietka, Karol
Vacuum Rabi splitting relies on symmetrical splitting of the common resonance frequency of atoms and the cavity in which the atoms reside. In this work, we argue that vacuum Rabi splitting is a manifestation of virtual light-matter two-mode squeezing
Externí odkaz:
http://arxiv.org/abs/2403.12177
Autor:
Ostermann, Laurin, Gietka, Karol
We show that the performance of critical quantum metrology protocols, counter-intuitively, can be enhanced by finite temperature. We consider a toy-model squeezing Hamiltonian, the Lipkin-Meshkov-Glick model and the paradigmatic Ising model. We show
Externí odkaz:
http://arxiv.org/abs/2312.04176
Publikováno v:
Physical Review Letters 132, 060801 (2024)
Critical metrology relies on the precise preparation of a system in its ground state near a quantum phase transition point where quantum correlations get very strong. Typically this increases the quantum Fisher information with respect to changes in
Externí odkaz:
http://arxiv.org/abs/2311.16472
Publikováno v:
Phys. Rev. Lett. 131, 223604 (2023)
Squeezing is essential to many quantum technologies and our understanding of quantum physics. Here we develop a theory of steady-state squeezing that can be generated in the closed and open quantum Rabi as well as Dicke model. To this end, we elimina
Externí odkaz:
http://arxiv.org/abs/2305.14290
Autor:
Gietka, Karol
It is commonly agreed that the electromagnetic vacuum is not empty but filled with virtual photons. This leads to effects like Lamb shift and spontaneous emission. Here we argue that if the vacuum has virtual photons it might mean that it is very wea
Externí odkaz:
http://arxiv.org/abs/2303.11631
Autor:
Gietka, Karol, Ritsch, Helmut
We predict that exploiting spin-orbit coupling in a harmonically trapped spinor quantum gas can lead to scaling of the optimal measurement precision beyond the Heisenberg scaling. We show that quadratic scaling with the number of atoms can be facilit
Externí odkaz:
http://arxiv.org/abs/2211.10436
In distributed quantum sensing the correlations between multiple modes, typically of a photonic system, are utilized to enhance the measurement precision of an unknown parameter. In this work we investigate the metrological potential of a multi-mode,
Externí odkaz:
http://arxiv.org/abs/2208.05128