Proposed Scheme to Generate Bright Entangled Photon Pairs by Application of a Quadrupole Field to a Single Quantum Dot

Abstract

Entangled photon sources are crucial for quantum optics, quantum sensing and quantum communication. Semiconductor quantum dots generate on-demand entangled photon pairs via the biexciton-exciton cascade. However, the pair of photons are emitted isotropically in all directions, thus limiting the collection efficiency to a fraction of a percent. Moreover, strain and structural asymmetry in quantum dots lift the degeneracy of the intermediate exciton states in the cascade, thus degrading the measured entanglement fidelity. Here, we propose an approach for generating a pair of entangled photons from a semiconductor quantum dot by application of a quadrupole electrostatic potential. We show that the quadrupole electric field corrects for the spatial asymmetry of the excitonic wavefunction for any quantum dot dipole orientation and fully erases the fine-structure splitting without compromising the spatial overlap between electrons and holes. Our approach is compatible with nanophotonic structures such as microcavities and nanowires, thus paving the way towards a deterministic source of entangled photons with high fidelity and collection efficiency.

References in corpus (15)

• On-demand generation of indistinguishable polarization-entangled photon pairs
• Bright single-photon sources in bottom-up tailored nanowires
• Size-dependent fine-structure splitting in self-organized InAs/GaAs quantum dots
• Electric-field-induced coherent coupling of the exciton states in a single quantum dot
• Manipulating exciton fine-structure in quantum dots with a lateral electric field
• Magnetic-field-induced reduction of the exciton polarization splitting in InAs quantum dots
• Symmetric quantum dots as efficient sources of highly entangled photons
• Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions
• Energy-tunable sources of entangled photons: a viable concept for solid-state-based quantum relays
• Universal growth scheme for entanglement-ready quantum dots
• Polarization sensitive spectroscopy of charged Quantum Dots
• Conquer the fine structure splitting of excitons in self-assembled InAs/GaAs quantum dots via combined stresses
• Electric-field-induced energy tuning of on-demand entangled-photon emission from self-assembled quantum dots
• Excitonic fine structure splitting in type-II quantum dots
• Path to perfect photon entanglement with a quantum dot

Cited by in corpus (5)

• Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution
• Dipole-Coupled Defect Pairs as Deterministic Entangled Photon Pair Sources
• Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots
• Entangled photons from composite cascade emitters
• Coherence-mediated squeezing of cavity field coupled to a coherently driven single quantum dot