Observation of dressed states of distant atoms with delocalized photons in coupled-cavities quantum electrodynamics

Abstract

In a cavity quantum electrodynamics (QED) system, where atoms coherently interact with photons in a cavity, the eigenstates of the system are the superposition states of atoms and cavity photons, the so-called dressed states of atoms. When two cavities are connected by an optical fiber with negligible loss, the coherent coupling between the cavities gives rise to photonic normal modes. One of these normal modes is the fiber-dark mode, in which photons are delocalized in the two distant cavities. Here we demonstrate the setting of coupled-cavities QED, where two nanofiber cavity-QED systems are coherently connected by a meter-long low-loss channel in an all-fiber fashion. Specifically, we observe dressed states of distant atoms with delocalized photons of the fiber-dark normal mode. Our system will provide a platform for the study of delocalized atomic and photonic states, photonic many-body physics, and distributed quantum computation.

Pronounced non-Markovian features in multiply excited, multiple emitter waveguide QED: Retardation induced anomalous population trapping

“…and therefore with |D = (|12 − |21 )/ √ 2 leads to such a dark state with H s l−m |D = 0. Therefore, with corresponding phase differences, such dark states can be driven via individual decays and lead to dark-state population, or population trapping, e.g., [3,6,23,24,44,73,80,81]. We conclude that, within the Markovian treatment, we find that either all emitters relax to their ground state or none of them do.…”

“…One-dimensional (1D) waveguide-QED systems are attractive platforms for engineering light-matter interactions and studying collective behavior in the ongoing efforts to construct scalable quantum networks [1][2][3][4][5][6][7][8][9][10][11][12]. Such systems are realized in photonic-like systems including photonic crystal waveguides [13][14][15][16][17][18][19], optical fibers [20][21][22][23][24], or metal and graphene plasmonic waveguides [25][26][27][28]. Due to their one-dimensional structure, long-distance interactions become significant [3,5,29].…”

“…Due to their one-dimensional structure, long-distance interactions become significant [3,5,29]. As a result of these interactions mediated by left-and right-moving quantized electromagnetic fields, strongly entangled dynamics and collective, cooperative effects related to Dicke sub-and superradiance emerge [1,6,12,17,[22][23][24][30][31][32][33][34][35][36][37].…”

Emergence of chaos and controlled photon transfer in a cavity-QED network

“…Introduction. High-precision controllability of cavity-QED (c-QED) systems and the potential of fabricating artificial lattices [1][2][3][4] highlights c-QED systems as an important component of quantum network [5][6][7][8][9][10]. The accessibility of a wide range of light-matter interaction (nonlinearity) signify its relevance for simulating strongly correlated systems [11][12][13][14] and demonstrate various phases, such as localization-delocalization [15][16][17], superfluid-Mott insulator [11,13,[18][19][20][21] phases.…”

Measurement and simulation of atomic motion in nanoscale optical trapping potentials

“…The statistics and correlations of this coupling noise put restrictions on the use of nanofiber trapped ensembles for quantum tasks, e.g. quantum memories or heralded single photon sources [5,[10][11][12], and provide a strong incentive to develop methods to cool the atoms as close as possible to the motional ground state of the trapping potential [13][14][15].…”