0000000000294434

AUTHOR

Ana Maria Rey

showing 3 related works from this author

Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices

2007

Quantum mechanical superexchange interactions form the basis of quantum magnetism in strongly correlated electronic media. We report on the direct measurement of superexchange interactions with ultracold atoms in optical lattices. After preparing a spin-mixture of ultracold atoms in an antiferromagnetically ordered state, we measure a coherent superexchange-mediated spin dynamics with coupling energies from 5 Hz up to 1 kHz. By dynamically modifying the potential bias between neighboring lattice sites, the magnitude and sign of the superexchange interaction can be controlled, thus allowing the system to be switched between antiferromagnetic or ferromagnetic spin interactions. We compare our…

Condensed Matter::Quantum GasesMultidisciplinaryHubbard modelCondensed matter physicsChemistryMagnetismFOS: Physical sciencesCondensed Matter - Other Condensed MatterFerromagnetismSuperexchangeUltracold atomLattice (order)AntiferromagnetismCondensed Matter::Strongly Correlated ElectronsQuantumOther Condensed Matter (cond-mat.other)
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Quantum many-body dynamics of coupled double-well superlattices

2008

We propose a method for controllable generation of non-local entangled pairs using spinor atoms loaded in an optical superlattice. Our scheme iteratively increases the distance between entangled atoms by controlling the coupling between the double wells. When implemented in a finite linear chain of 2N atoms, it creates a triplet valence bond state with large persistency of entanglement (of the order of N). We also study the non-equilibrium dynamics of the one-dimensional ferromagnetic Heisenberg Hamiltonian and show that the time evolution of a state of decoupled triplets on each double well leads to the formation of a highly entangled state where short-distance antiferromagnetic correlatio…

Condensed Matter::Quantum GasesPhysicsQuantum PhysicsStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsSuperlatticeTime evolutionFOS: Physical sciencesQuantum simulatorQuantum entanglementAtomic and Molecular Physics and OpticsCondensed Matter - Other Condensed MatterCondensed Matter - Strongly Correlated Electronssymbols.namesakeQuantum mechanicssymbolsValence bond theoryW stateQuantum Physics (quant-ph)Hamiltonian (quantum mechanics)QuantumOther Condensed Matter (cond-mat.other)Physical Review A
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The effect of active photons on dynamical frustration in cavity QED

2020

We study the far-from-equilibrium dynamical regimes of a many-body spin boson model with disordered couplings relevant for cavity QED and trapped ions experiments, using the discrete truncated Wigner approximation (DTWA). We focus on the dynamics of spin observables upon varying the disorder strength and the frequency of the photons, finding that the latter can considerably alter the structure of the system's dynamical responses. When the photons evolve at a similar rate as the spins, they can induce qualitatively distinct frustrated dynamics characterized by either logarithmic or algebraically slow relaxation. The latter illustrates resilience of glassy-like dynamics in the presence of act…

PhysicsPhotonSpinsPhononmedia_common.quotation_subjectDegrees of freedom (physics and chemistry)General Physics and AstronomyFrustrationFOS: Physical sciencesDisordered Systems and Neural Networks (cond-mat.dis-nn)Condensed Matter - Disordered Systems and Neural Networks01 natural sciencesQuantum mechanics0103 physical sciences010306 general physicsQuantum information scienceQuantumSpin-½media_common
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