Entanglement dynamics and Mollow nonuplets between two coupled quantum dots in a nanowire photonic-crystal system

Angelatos, Gerasimos; Hughes, Stephen

doi:10.1103/physreva.91.051803

Cited by 19 publications

(12 citation statements)

References 37 publications

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“…In that work, sidebands at frequencies ω a ± 2Ω were shown to rise in the spectrum, yet the effect is substantial only for atoms closer than a wavelength. A similar effect was predicted for pairs of quantum dots [31]. Treating more than two atoms is much harder.…”

Section: Methodssupporting

confidence: 73%

Quantum effects in the cooperative scattering of light by atomic clouds

et al. 2017

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Scattering of classical light by atomic clouds induces photon-mediated effective long-range interactions between the atoms and leads to cooperative effects even at low atomic densities. We introduce a novel simulation technique that allows us to investigate the quantum regime of the dynamics of large clouds of atoms. We show that the fluorescence spectrum of the cloud can be used to probe genuine quantum cooperative effects. Signatures of these effects are the occurrence, and the scaling behavior, of additional sidebands at twice the frequency of the classical Mollow sidebands, as well as an asymmetry of the Mollow triplet

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Section: Methodssupporting

confidence: 73%

Quantum effects in the cooperative scattering of light by atomic clouds

et al. 2017

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“…3. The steady-state entanglement is not strongly affected by viable experimental pure dephasing rates 34 . In Fig.…”

Section: Steady-state Entanglementmentioning

confidence: 93%

Steady-state entanglement between distant quantum dots in photonic crystal dimers

et al. 2016

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We show that two spatially separated semiconductor quantum dots under resonant and continuous-wave excitation can be strongly entangled in the steady-state, thanks to their radiative coupling by mutual interaction through the normal modes of a photonic crystal dimer. We employ a quantum master equation formalism to quantify the steady-state entanglement by calculating the system negativity. Calculations are specified to consider realistic semiconductor nanostructure parameters for the photonic crystal dimer-quantum dots coupled system, determined by a guided mode expansion solution of Maxwell equations. Negativity values of the order of 0.1 (20% of the maximum value) are shown for interdot distances that are larger than the resonant wavelength of the system. It is shown that the amount of entanglement is almost independent of the interdot distance, as long as the normal mode splitting of the photonic dimer is larger than their linewidths, which becomes the only requirement to achieve a local and individual qubit addressing. Considering inhomogeneously broadened quantum dots, we find that the steady-state entanglement is preserved as long as the detuning between the two quantum dot resonances is small when compared to their decay rates. The steady-state entanglement is shown to be robust against the effects of pure dephasing of the quantum dot transitions. We finally study the entanglement dynamics for a configuration in which one of the two quantum dots is initially excited and find that the transient negativity can be enhanced by more than a factor of two with respect to the steady-state value. These results are promising for practical applications of entangled states at short time scales.

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“…In the strongly nonreciprocal (unidirectional) case, only one pole is present, leading to only one term in (43). Figure 12b shows the magnetic field in the bulk bandgap for ω c > 0 obtained by numerical evaluation of the Sommerfeld integral (40), and by assuming only the residue component (43) (since we operate in the bulk bandgap and the gap Chern number is −1, then there is one unidirectional SPP). The opaque medium is topologically-trivial, and is an unbiased plasma having ε = −2.…”

Section: Appendix Ii: Comparison With Previous 1d Chiral Theorymentioning

confidence: 99%

Robust entanglement with three-dimensional nonreciprocal photonic topological insulators

2017

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We investigate spontaneous and pumped entanglement of two level systems in the vicinity of a photonic topological insulator interface, which supports a nonreciprocal (unidirectional), scatteringimmune and topologically-protected surface plasmon polariton in the bandgap of the bulk material. To this end, we derive a master equation for qubit interactions in a general three-dimensional, nonreciprocal, inhomogeneous and lossy environment. The environment is represented exactly, via the photonic Green function. The resulting entanglement is shown to be extremely robust to defects occurring in the material system, such that strong entanglement is maintained even if the interface exhibits electrically-large and geometrically sharp discontinuities. Alternatively, depending on the initial excitation state, using a non-reciprocal environment allows two qubits to remain unentangled even for very close spacing. The topological nature of the material is manifest in the insensitivity of the entanglement to variations in the material parameters that preserve the gap Chern number. Our formulation and results should be useful for both fundamental investigations of quantum dynamics in nonreciprocal environments, and technological applications related to entanglement in two-level systems.

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Entanglement dynamics and Mollow nonuplets between two coupled quantum dots in a nanowire photonic-crystal system

Cited by 19 publications

References 37 publications

Quantum effects in the cooperative scattering of light by atomic clouds

Quantum effects in the cooperative scattering of light by atomic clouds

Steady-state entanglement between distant quantum dots in photonic crystal dimers

Robust entanglement with three-dimensional nonreciprocal photonic topological insulators

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