Dissipation generally leads to the decoherence of a quantum state. In contrast, numerous recent proposals have illustrated that dissipation can also be tailored stabilize many-body entangled states. While focus these works has been primarily on engineering nonequilibrium steady state, we investigate buildup entanglement in trajectories. Specifically, analyze competition between two different channels arising from incompatible continuous monitoring protocols. The first protocol locks phase...

In an atomic Bose-Einstein condensate quenched to the unitary regime, we predict sequential formation of a significant fraction condensed pairs and triples. At short distances, demonstrate two-body Efimovian character triples, respectively. As system evolves, their size becomes comparable interparticle distance, such that many-body effects become significant. The structure triples depends on Efimov states compared with density scales. Unexpectedly, find universal in limit where these scales...

We study the propagation of information through a Kitaev chain with long-range pairing interactions. Although Lieb-Robinson bound is violated in strict sense for interacting systems, we illustrate that major amount this model still propagates ballistically on light cone. find pronounced effect interaction range decay mutual between spatially disconnected subsystems. A significant shared at timelike separations. This regime accompanied by very slow equilibration local observables. As...

The dynamics of a weakly interacting Bose gas at low temperatures is close to integrable due the approximate quadratic nature many-body Hamiltonian. While short-time physics after an abrupt ramp interaction constant dominated by dynamics, integrability broken longer times higher-order terms in Bogoliubov Hamiltonian, particular, Beliaev-Landau scatterings involving three quasiparticles. two-stage relaxation process highlighted evolution local observables such as density-density correlation...

We study the quench of a degenerate ultracold Bose gas to unitary regime, where interactions are as strong allowed by quantum mechanics. lay foundation cumulant theory able simultaneously capture three-body Efimov effect and ergodic evolution. After an initial period rapid depletion, universal prethermal stage is established, characterized kinetic temperature emergent Bogoliubov dispersion law, while microscopic degrees freedom remain far from equilibrium. Integrability then broken...

The possibility of a negative drag force on defect in nonequilibrium polariton quantum fluids is presented. We relate this phenomenon to the selective parametric amplification waves scattered by defect. This leads prediction that mobile defects acquire nonzero velocity with respect fluid. derive direct relation between and momentum distribution fluid, which allows for experimental verification our predictions.

We investigate Beliaev-Landau scattering in a gas of interacting photons coherently driven array nonlinear dissipative resonators, as described by the 1D driven-dissipative Bose-Hubbard model. Due to absence detailed balance such an out-of-equilibrium setup, steady-state properties can be much more sensitive underlying microscopic dynamics. As popular truncated Wigner approximation dramatically fails capturing this physics, we present alternative approach, based on systematic expansion...

The dynamics of open quantum systems is generally described by a master equation, which describes the loss information into environment. By using simple model uncoupled emitters, we illustrate how recovery this depends on monitoring scheme applied to register decay clicks. dissipative dynamics, in case, pure-state stochastic trajectories, and examine different unravelings same equation. More precisely, demonstrate registering sequence clicks from spontaneously emitted photons through linear...

Quantum fluids of light in a nonlinear planar microcavity can exhibit antibunched photon statistics at short distances due to repulsive polariton interactions. We show that, despite the weakness nonlinearity, antibunching signal be amplified orders magnitude with an appropriate free-space optics scheme select and interfere output modes. Our results are understood from unconventional blockade perspective by analyzing approximate Gaussian state microcavity. In second part, we illustrate how...

We propose a pump-probe set-up to analyse the properties of collective excitation spectrum spinor polariton fluid. By using linear response approximation scheme, we carry on complete classification all spectra, as well their intrinsic degree polarisation, in terms two experimentally tunable parameters only, mean-field polarisation angle and rescaled pump detuning. evaluate system external probe, show that transmitted light can undergo spin rotation along dispersion for spectra classify...

Simulating and predicting dynamics of quantum many-body systems is extremely challenging, even for state-of-the-art computational methods, due to the spread entanglement across system. However, in long-wavelength limit, often admit a simplified description, which involves small set physical observables requires only few parameters such as sound velocity or viscosity. Unveiling relationship between these hydrodynamic equations underlying microscopic theory usually great effort by condensed...