Collective Radiative Dynamics of an Ensemble of Cold Atoms Coupled to an Optical Waveguide

Pennetta, Riccardo; Blaha, Martin; Johnson, Aisling; Lechner, Daniël; Schneeweiß, Philipp; Volz, Jürgen; Rauschenbeutel, Arno

doi:10.1103/physrevlett.128.073601

Cited by 38 publications

(17 citation statements)

References 28 publications

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“…There, the theoretical description becomes increasingly complex due to the exponential scaling of the system's Hilbert space with the number of emitters [19][20][21][22][23][24][25]. Recently, nanofiber-based atom-light interfaces have opened a new experimental avenue for studying collective radiative dynamics with waveguide-coupled atoms [26][27][28][29][30][31][32][33]. There, all emitters couple efficiently to the guided optical mode, and propagation-direction-dependent coupling can be implemented, providing access to the field of chiral quantum optics [34].…”

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confidence: 99%

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Collective excitation and decay of waveguide-coupled atoms: from timed Dicke states to inverted ensembles

Liedl¹,

Pucher²,

Tebbenjohanns³

et al. 2022

Preprint

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The collective absorption and emission of light by an ensemble of atoms is at the heart of many fundamental quantum optical effects and the basis for numerous applications. However, beyond weak excitation, both experiment and theory become increasingly challenging. Here, we explore the regimes from weak excitation to inversion with ensembles of up to one thousand atoms that are trapped and optically interfaced using the evanescent field surrounding an optical nanofiber. We realize strong inversion, with about 80 % of the atoms being excited, and study their subsequent radiative decay into the guided modes. The data is very well described by a simple model that assumes a cascaded interaction of the guided light with the atoms. Our results contribute to the fundamental understanding of the collective interaction of light and matter and are relevant for applications ranging from quantum memories to sources of nonclassical light to optical frequency standards.

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confidence: 99%

“…2(a), we observe that P f decreases during the excitation pulse as predicted by linear response. Subsequently, the atoms emit fluorescence into the waveguide with a collectively enhanced decay constant of 6.1(1) ns [33].…”

mentioning

confidence: 99%

Collective excitation and decay of waveguide-coupled atoms: from timed Dicke states to inverted ensembles

Liedl¹,

Pucher²,

Tebbenjohanns³

et al. 2022

Preprint

Self Cite

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“…With the maturation of quantum photonic platforms, light-matter interaction is no longer limited to the control of single emitters [1][2][3], as multi-emitter systems are increasingly being developed and investigated [4][5][6][7]. Of the different platforms, waveguide quantum electrodynamics (w-QED) where quantum emitters are coupled to photonic waveguides [4][5][6][8][9][10], is particularly promising. Solid-state w-QED systems allow on-chip integration based on reliable nanofabrication [9,11,12], permitting electrical control over the emitter resonances [2,13,14], although scaling-up to many emitters is challenged by inhomogeneous broadening unlike the case of atoms [10].…”

Section: Introductionmentioning

confidence: 99%

“…Of the different platforms, waveguide quantum electrodynamics (w-QED) where quantum emitters are coupled to photonic waveguides [4][5][6][8][9][10], is particularly promising. Solid-state w-QED systems allow on-chip integration based on reliable nanofabrication [9,11,12], permitting electrical control over the emitter resonances [2,13,14], although scaling-up to many emitters is challenged by inhomogeneous broadening unlike the case of atoms [10]. Importantly, even few quantum emitters deterministically coupled to a waveguide can be a very powerful quantum resource since each emitter can produce a high number of photonic qubits.…”

Section: Introductionmentioning

confidence: 99%

Sub-radiant states for imperfect quantum emitters coupled by a nanophotonic waveguide

Chu¹,

Angelopoulou²,

Lodahl³

et al. 2022

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Coherent interactions between quantum emitters in tailored photonic structures is a fundamental building block for future quantum technologies, but remains challenging to observe in complex solid-state environments, where the role of decoherence must be considered. Here, we investigate the optical interaction between two quantum emitters mediated by one-dimensional waveguides in a realistic solid-state environment, focusing on the creation, population and detection of a subradiant state, in the presence of dephasing. We show that as dephasing increases, the signatures of sub-radiance quickly vanish in intensity measurements yet remain pronounced in photon correlation measurements, particularly when the two emitters are pumped separately so as to populate the subradiant state efficiently. The applied Green's tensor approach is used to model a photonic crystal waveguide, including the dependence on the spatial position of the integrated emitter. The work lays out a route to the experimental realization of sub-radiant states in nanophotonic waveguides containing solid-state emitters.

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“…To this end, state-of-art photonic interfaces have been developed to control the spontaneous emission, to support many-body interaction mediated by exchange of confined photons, and for information delivery through well-defined photonic channels into the far field [1]. In particular, it is demonstrated that cold atoms coupled to an optical nanofiber (ONF) [2][3][4][5][6] displays infinitely long-range interaction mediated by exchange of guided photons [7][8][9]. In this scenario, a potentially paradigm-shifting technique is to precisely control the atomic dipoles with subwavelength spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Composite picosecond control of atomic state through a nanofiber interface

Ma¹,

Liu²,

Ji³

et al. 2022

Preprint

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Accurate control of single emitters at nanophotonic interfaces may greatly expand the accessible quantum states of coupled optical spins in the confined geometry and to unveil exotic nonlinear quantum optical effects. However, the optical control is challenged by spatially varying light-atom coupling strength generic to nanophotonics. We demonstrate numerically that despite the nearfield inhomogenuity, nearly perfect atomic state control can be achieved by exploiting geometric robustness of optical transitions with composite picosecond excitations. Our proposal is followed by a proof-of-principle demonstration where an N = 3 composite sequence is applied to robustly invert the D1 population of free-flying 85 Rb atoms trespassing a nanofiber interface. The precise control is confirmed by comparing the D2 fiber transmission with full-level simulation of the mesoscopic light-atom interaction across the composite parameter space. We project the scheme to large N for precise phase patterning and arbitrary optical dipole control at the nanophotonic interface.

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Collective Radiative Dynamics of an Ensemble of Cold Atoms Coupled to an Optical Waveguide

Cited by 38 publications

References 28 publications

Collective excitation and decay of waveguide-coupled atoms: from timed Dicke states to inverted ensembles

Collective excitation and decay of waveguide-coupled atoms: from timed Dicke states to inverted ensembles

Sub-radiant states for imperfect quantum emitters coupled by a nanophotonic waveguide

Composite picosecond control of atomic state through a nanofiber interface

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