Effect of Pure Dephasing and Phonon Scattering on the Coupling of Semiconductor Quantum Dots to Optical Cavities

Abstract

Using site-controlled semiconductor quantum dots (QDs) free of multiexcitonic continuum states, integrated with photonic crystal membrane cavities, we clarify the effects of pure dephasing and phonon scattering on exciton-cavity coupling in the weak-coupling regime. In particular, the observed QD-cavity copolarization and cavity mode feeding versus QD-cavity detuning are explained quantitatively by a model of a two-level system embedded in a solid-state environment.

Deterministic radiative coupling of two semiconductor quantum dots to the optical mode of a photonic crystal nanocavity

“…In this work, we demonstrate such deterministic radiative coupling of two site-controlled QDs a PhC cavity, manifested by the observation of co-polarization and Purcell enhancement of their photoluminescence and confirmed with a microscopic model 21 . These results illustrate a scalable approach to QD-based integrated quantum photonics.…”

“…In this case of a strongly polarized CM and a symmetric QD showing otherwise isotropic polarization of emission in the cavity plane, the QD emission becomes co-polarized with the CM for sufficiently small detuning, a consequence of the Purcell effect 21 . Strikingly, their DOLP follows an s-shaped curve with a maximum value at resonance of ~0.9, corresponding to the DOLP of the CM 29 .…”

“…1) was produced using site-controlled InGaAs/GaAs pyramidal QD structures, which ensured a mutual alignment accuracy of ~50  nm 21–23 . In the vicinity of the double-QD structures, additional control structures containing a single QD at the center of an L 3 PhC cavity were implemented (same design as in Fig.…”

Squeezing‐Enhanced Atom–Cavity Interaction in Coupled Cavities with High Dissipation Rates

“…The primary cavity contains a two level atom with transition frequency ω 0 and a χ (2) nonlinear medium that is pumped with frequency ω p , amplitude p , and phase θ p . [1,8,9,22,23] The squeezing environment is generally implemented via the process of optical parametric amplification (OPA). [17] A high bandwidth squeezed vacuum field, which can be thought of as a squeezed vacuum reservoir (with squeezing parameter r e and reference phase θ e ), is injected into the primary cavity [15] .…”

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The realization of the strong coupling regime is requisite for implementing quantum information tasks. [7][8][9] Strong coupling regime, where atom-cavity coupling strength has to be comparable or larger than atomic spontaneous emission rate γ and cavity decay rate κ, [10,11] is indispensable for experimentally investigating a manifold of quantum phenomena and implementing quantum information processing (QIP). By introducing parametric squeezing into the primary cavity, which is only virtually excited under specific parametric conditions, coupling enhancement between the atom and the auxiliary cavity is realized for appropriate squeezing parameters.

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