Photoneutralization of charges in GaAs quantum dot based entangled photon emitters
arXiv:2110.02346 · doi:10.1103/PhysRevB.105.115301
Abstract
Semiconductor-based emitters of pairwise photonic entanglement are a promising constituent of photonic quantum technologies. They are known for the ability to generate discrete photonic states on-demand with low multiphoton emission, near-unity entanglement fidelity, and high single photon indistinguishability. However, quantum dots typically suffer from luminescence blinking, lowering the efficiency of the source and hampering their scalable application in quantum networks. In this paper, we investigate and adjust the intermittence of the neutral exciton emission in a GaAs/AlGaAs quantum dot under two-photon resonant excitation of the neutral biexciton. We investigate the spectral and quantum optical response of the quantum dot emission to an additional wavelength tunable gate laser, revealing blinking caused by the intrinsic Coulomb blockade due to charge capture processes. Our finding demonstrates that the emission quenching can be actively suppressed by controlling the balance of free electrons and holes in the vicinity of the quantum dot and thereby significantly increasing the quantum efficiency by 30%.
arXiv comment7 pages, 4 figures
References in corpus (24)
- Quantum computational advantage using photons
- Near optimal single photon sources in the solid state
- Measurement device independent quantum key distribution over 404 km optical fibre
- Boson sampling with 20 input photons in 60-mode interferometers at state spaces
- A solid-state entangled photon pair source with high brightness and indistinguishability
- On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
- Enhanced photon-extraction efficiency from deterministic quantum-dot microlenses
- One-second coherence for a single electron spin coupled to a multi-qubit nuclear-spin environment
- Highly indistinguishable and strongly entangled photons from symmetric GaAs quantum dots
- Strain-Tunable GaAs Quantum dot: A Nearly Dephasing-Free Source of Entangled Photon Pairs on Demand
- Low-Noise GaAs Quantum Dots for Quantum Photonics
- Subnanosecond spectral diffusion measurement using photon correlation
- Experimental quantum repeater without quantum memory
- Sub-microsecond correlations in photoluminescence from InAs quantum dots
- Phonon-assisted two-photon interference from remote quantum emitters
- Decoherence-protected memory for a single-photon qubit
- Quantum interference between light sources separated by 150 million kilometers
- Resonance fluorescence of GaAs quantum dots with near-unity photon indistinguishability
- An artificial Rb atom in a semiconductor with lifetime-limited linewidth
- Multiple time scale blinking in InAs quantum dot single-photon sources
- Two-photon- photoluminescence excitation spectroscopy of single quantum-dots
- Two-photon interference from two blinking quantum emitters
- Deterministic preparation of spin qubits in droplet etched GaAs quantum dots using quasi-resonant excitation
- Effects of photo-neutralization on the emission properties of quantum dots