Phonon Decoherence of Quantum Dots in Photonic Structures: Broadening of the Zero-Phonon Line and the Role of Dimensionality

We report a joint experimental and theoretical study of the interference properties of a single-photon source based on a In(Ga)As quantum dot embedded in a quasiplanar GaAs microcavity. Using resonant laser excitation with a pulse separation of 2 ns, we find near-perfect interference of the emitted photons, and a corresponding indistinguishability of I = (99.6 + 0.4 − 1.4 )%. For larger pulse separations, quasiresonant excitation conditions, increasing pump power, or with increasing temperature, the interference contrast is progressively and notably reduced. We present a systematic study of the relevant dephasing mechanisms and explain our results in the framework of a microscopic model of our system. For strictly resonant excitation, we show that photon indistinguishability is independent of pump power, but strongly influenced by virtual phonon-assisted processes which are not evident in excitonic Rabi oscillations.

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“…is the pure-dephasing rate due to the virtual phonon scattering [47,49]. Using this expression, the final master equation becomes…”

Section: Appendix B: Rabi Oscillation Master Equationmentioning

confidence: 99%

Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source

et al. 2018

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“…The successful interference relies on highly coherent and indistinguishable single photons, which requires a sufficiently long coherence time compared to the spontaneous decay time , that is 2 . However, the existence of phonon interactions and charge fluctuations in the solidstate environment causes timing and spectral jitters as well as pure dephasing, and thus the emitters have a broad emission linewidth compared to their intrinsic linewidth limited by the lifetime [117]. Such linewidth broadening is worse with an above-band excitation scheme that increases unnecessary interactions in solid-state systems.…”

Section: A Coherent Control Of Quantum Emittersmentioning

confidence: 99%

Hybrid integration methods for on-chip quantum photonics

Kim

Aghaeimeibodi

Carolan

et al. 2020

Optica

207

181

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The goal of integrated quantum photonics is to combine components for the generation, manipulation, and detection of non-classical light in a phase stable and efficient platform. Solid-state quantum emitters have recently reached outstanding performance as single photon sources. In parallel, photonic integrated circuits have been advanced to the point that thousands of components can be controlled on a chip with high efficiency and phase stability. Consequently, researchers are now beginning to combine these leading quantum emitters and photonic integrated circuit platforms to realize the best properties of each technology. In this article, we review recent advances in integrated quantum photonics based on such hybrid systems. Although hybrid integration solves many limitations of individual platforms, it also introduces new challenges that arise from interfacing different materials. We review various issues in solid-state quantum emitters and photonic integrated circuits, the hybrid integration techniques that bridge these two systems, and methods for chip-based manipulation of photons and emitters. Finally, we discuss the remaining challenges and future prospects of on-chip quantum photonics with integrated quantum emitters. PHOTONIC INTEGRATED CIRCUIETS FOR QUANTUM PHOTONICSPICs provide a compact, phase stable, and high-bandwidth platform to transmit, manipulate, and detect light on-chip. By leveraging advances in semiconductor manufacturing for classical communication, PICs have been demonstrated with over a thousand active components in a few square mm [50]. Now, with many foundries offering multi-26. I. Aharonovich, D. Englund, and M. Toth, "Solid-state single-photon emitters," Nat. Photonics 10, 631 (2016) , "Neardeterministic activation of room-temperature quantum emitters in hexagonal boron nitride," Optica 5, 1128-1134 (2018)

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“…The calculation of the ID follows the derivations of Reference [27] and the key results are summarized below. The interaction between a QD exciton and an acoustic phonon mode is well described by the electron-phonon deformation-potential interaction [17,25,27,31], which characterizes the effects on the bandstructure due to strain. We assume that at low temperatures only the exciton ground state |ψ 1 is populated.…”

Section: Theory Of the Exciton-phonon Interaction And Numerical Modelmentioning

confidence: 99%

“…For QDs in a homogeneous material (bulk), the phonon sideband and the broadening of the ZPL can be explained by a linear (absorption and emission of phonons) and quadratic exciton-phonon coupling (elastic scattering processes), respectively [17,23,24,25]. In photonic nanostructures, the picture is more involved and additional linear contributions to the broadening of the ZPL have been identified [26,27], which constitute the dominant dephasing mechanism at low temperatures. The sideband photons may readily and efficiently be removed by spectral filtering.…”

Section: Introductionmentioning

confidence: 99%

“…dimensional geometry, phonon decoherence processes are stronger than in bulk systems because of the enhanced phonon density of states at low frequencies [26,27,29,30]. We propose a realistic device that overcomes these limitations by suppressing the relevant phonon modes with a low refractive index cladding material that effectively clamps the system while preserving efficient optical coupling of the QD to the GaAs waveguide, c.f.…”

Section: Introductionmentioning

confidence: 99%

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Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

Dreeßen

Ouellet-Plamondon

Tighineanu

et al. 2018

Quantum Sci. Technol.

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The fundamental process limiting the coherence of quantum-dot based single-photon sources is the interaction with phonons. We study the effect of phonon decoherence on the indistinguishability of single photons emitted from a quantum dot embedded in a suspended nanobeam waveguide. At low temperatures, the indistinguishability is limited by the coupling between the quantum dot and the fundamental vibrational modes of the waveguide and is sensitive to the quantum-dot position within the nanobeam cross-section. We show that this decoherence channel can be efficiently suppressed by clamping the waveguide with a low refractive index cladding material deposited on the waveguide. With only a few microns of cladding material, the coherence of the emitted single photons is drastically improved. We show that the degree of indistinguishability can reach near unity and become independent of the quantum-dot position. We finally show that the cladding material may serve dual purposes since it can also be applied as a means to efficiently outcouple single photons from the nanophotonic waveguide into an optical fiber. Our proposal paves the way for a highly efficient fiber-coupled source of indistinguishable single photons based on a planar nanophotonic platform. arXiv:1806.05925v1 [physics.app-ph]

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Phonon Decoherence of Quantum Dots in Photonic Structures: Broadening of the Zero-Phonon Line and the Role of Dimensionality

Cited by 65 publications

References 65 publications

Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source

Intrinsic and environmental effects on the interference properties of a high-performance quantum dot single-photon source

Hybrid integration methods for on-chip quantum photonics

Suppressing phonon decoherence of high performance single-photon sources in nanophotonic waveguides

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