Cavity Dark Mode of Distant Coupled Atom-Cavity Systems

Abstract

We report on a combined experimental and theoretical investigation into the normal modes of an all-fiber coupled cavity-quantum-electrodynamics system. The interaction between atomic ensembles and photons in the same cavities, and that between the photons in these cavities and the photons in the fiber connecting these cavities, generates five non-degenerate normal modes. We demonstrate our ability to excite each normal mode individually. We study particularly the 'cavity dark mode', in which the two cavities coupled directly to the atoms do not exhibit photonic excitation. Through the observation of this mode, we demonstrate remote excitation and nonlocal saturation of atoms.

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].…”

Revisiting Quantum Feedback Control: Disentangling the Feedback‐Induced Phase from the Corresponding Amplitude

“…Subsequently, in Section we derive our new control scheme in detail and compare it to the scheme in which only the delay time τ is used as a control parameter. We demonstrate that the application of a microwave pump field opens up new possibilities in potential experimental realizations and allows a fast and efficient stabilization of the excitation as well as population trapping …”

Spin selection in single-frequency two-photon excitation of alkali-metal atoms

“…In recent years, there has been significant interest in shifting toward light fields confined at the micro-or even nanoscale [15,16]. In one of the more popular systems, neutral atoms are coupled to the evanescent field of a vacuum-clad optical nanofiber (ONF) [17][18][19][20][21][22][23][24]. Strong confinement of light around the ultrathin ONF waist region has led to demonstrations of two-photon and nonlinear atomic processes at ultralow excitation powers [25][26][27][28], including an electric quadrupole transition driven by a few microwatts [29].…”