



@article {3024,
	title = {Monitoring-induced Entanglement Entropy and Sampling Complexity},
	year = {2022},
	month = {1/29/2022},
	abstract = {<p>The dynamics of open quantum systems is generally described by a master equation, which describes the loss of information into the environment. By using a simple model of uncoupled emitters, we illustrate how the recovery of this information depends on the monitoring scheme applied to register the decay clicks. The dissipative dynamics, in this case, is described by pure-state stochastic trajectories and we examine different unravelings of the same master equation. More precisely, we demonstrate how registering the sequence of clicks from spontaneously emitted photons through a linear optical interferometer induces entanglement in the trajectory states. Since this model consists of an array of single-photon emitters, we show a direct equivalence with Fock-state boson sampling and link the hardness of sampling the outcomes of the quantum jumps with the scaling of trajectory entanglement.</p>},
	keywords = {FOS: Physical sciences, Quantum Physics (quant-ph)},
	doi = {10.48550/ARXIV.2201.12672},
	url = {https://arxiv.org/abs/2201.12672},
	author = {Van Regemortel, Mathias and Shtanko, Oles and Garc{\'\i}a-Pintos, Luis Pedro and Deshpande, Abhinav and Dehghani, Hossein and Alexey V. Gorshkov and Hafezi, Mohammad}
}
@article {3129,
	title = {Optical conductivity and orbital magnetization of Floquet vortex states},
	year = {2022},
	month = {4/20/2022},
	abstract = {<p>Motivated by recent experimental demonstrations of Floquet topological insulators, there have been several theoretical proposals for using structured light, either spatial or spectral, to create other properties such as flat band and vortex states. In particular, the generation of vortex states in a massive Dirac fermion insulator irradiated by light carrying nonzero orbital angular momentum (OAM) has been proposed [Kim et al. Phys. Rev. B 105, L081301(2022)]. Here, we evaluate the orbital magnetization and optical conductivity as physical observables for such a system. We show that the OAM of light induces nonzero orbital magnetization and current density. The orbital magnetization density increases linearly as a function of OAM degree. In certain regimes, we find that orbital magnetization density is independent of the system size, width, and Rabi frequency of light. It is shown that the orbital magnetization arising from our Floquet theory is large and can be probed by magnetometry measurements. Furthermore, we study the optical conductivity for various types of electron transitions between different states such as vortex, edge, and bulk that are present in the system. Based on conductance frequency peaks, a scheme for the detection of vortex states is proposed.</p>},
	keywords = {FOS: Physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Other Condensed Matter (cond-mat.other)},
	doi = {10.48550/ARXIV.2204.09488},
	url = {https://arxiv.org/abs/2204.09488},
	author = {Ahmadabadi, Iman and Dehghani, Hossein and Hafezi, Mohammad}
}
