Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Chenu, Aurélia"'
We study the quantum dynamics generated by a non-Hermitian Hamiltonian subject to stochastic perturbations in its anti-Hermitian part, describing fluctuating gains and losses. The master equation governing the noise-average dynamics describes a new f
Externí odkaz:
http://arxiv.org/abs/2407.07746
Non-Hermitian dynamics in quantum systems preserves the rank of the state density operator. We use this insight to develop its geometrical description. In particular, we identify mutually orthogonal coherent and incoherent directions and give their p
Externí odkaz:
http://arxiv.org/abs/2405.13913
Publikováno v:
Phys. Rev. B 109, L140201 (2024)
Strong local disorder in interacting quantum spin chains can turn delocalized eigenmodes into localized eigenstates, giving rise to many-body localized (MBL) phases. This is accompanied by distinct spectral statistics: chaotic for the delocalized pha
Externí odkaz:
http://arxiv.org/abs/2311.16229
Correlations between the eigenenergies of a system's spectrum can be a defining feature of quantum chaos. We characterize correlations between energies for all spectral distances by studying the distributions of $k$-th neighbor level spacings ($k$nLS
Externí odkaz:
http://arxiv.org/abs/2311.09292
Autor:
Roccati, Federico, Bello, Miguel, Gong, Zongping, Ueda, Masahito, Ciccarello, Francesco, Chenu, Aurélia, Carollo, Angelo
Publikováno v:
Nat Commun 15, 2400 (2024)
Light can mediate effective dipole-dipole interactions between atoms or quantum emitters coupled to a common environment. Exploiting them to tailor a desired effective Hamiltonian can have major applications and advance the search for many-body phase
Externí odkaz:
http://arxiv.org/abs/2303.00762
Publikováno v:
Phys. Rev. Lett. 131, 160202 (2023)
Noise is ubiquitous in nature, so it is essential to characterize its effects. Considering a fluctuating Hamiltonian, we introduce an observable, the stochastic operator variance (SOV), which measures the spread of different stochastic trajectories i
Externí odkaz:
http://arxiv.org/abs/2302.12845
Autor:
Matsoukas-Roubeas, Apollonas S., Roccati, Federico, Cornelius, Julien, Xu, Zhenyu, Chenu, Aurelia, del Campo, Adolfo
Publikováno v:
J. High Energ. Phys. 2023, 60 (2023)
The construction of exactly-solvable models has recently been advanced by considering integrable $T\bar{T}$ deformations and related Hamiltonian deformations in quantum mechanics. We introduce a broader class of non-Hermitian Hamiltonian deformations
Externí odkaz:
http://arxiv.org/abs/2211.05437
Autor:
Martinez-Azcona, Pablo, Chenu, Aurélia
Publikováno v:
Quantum 6, 852 (2022)
Quantum chaos cannot develop faster than $\lambda \leq 2 \pi/(\hbar \beta)$ for systems in thermal equilibrium [Maldacena, Shenker & Stanford, JHEP (2016)]. This `MSS bound' on the Lyapunov exponent $\lambda$ is set by the width of the strip on which
Externí odkaz:
http://arxiv.org/abs/2202.11715
Publikováno v:
Phys. Rev. B 105, 035301 (2022)
We consider photons strongly coupled to the excitonic excitations of a coupled quantum well, in the presence of an electric field. We show how under a field increase, the hybrid polariton made of photon coupled to hybrid carriers lying in the two wel
Externí odkaz:
http://arxiv.org/abs/2112.08779
Publikováno v:
Phys. Rev. Lett. 128, 190402 (2022)
The dynamical signatures of quantum chaos in an isolated system are captured by the spectral form factor, which exhibits as a function of time a dip, a ramp, and a plateau, with the ramp being governed by the correlations in the level spacing distrib
Externí odkaz:
http://arxiv.org/abs/2108.06784