Entangled photons on demand: Erasing which-path information with sidebands

Abstract

The biexciton cascade in a quantum dot can be used to generate entangled-photon pairs rapidly and deterministically (on demand). However, due to a large fine-structure splitting between intermediate exciton energy levels, which-path information encoded in the frequencies of emitted photon pairs leads to a small degree of entanglement. Here we show that this information can be efficiently erased by modulating the exciton and biexciton energy levels, giving rise to new decay paths through additional sidebands. The resulting degree of entanglement is substantial, and can be made maximal through spectral filtering, with only a nominal reduction in collection efficiency.

4 pages, 3 figures; New title, discussion of dephasing added, version published in Phys. Rev. B

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Cited by in corpus (8)

• Resolved Sideband Emission of InAs/GaAs Quantum Dots Strained by Surface Acoustic Waves
• The role of phonons for exciton and biexciton generation in an optically driven quantum dot
• Entangled Photon Pair Generation in Hybrid Superconductor-Semiconductor Quantum Dot Devices
• Floquet engineering the quantum Rabi model in the ultrastrong coupling regime
• Universal finestructure eraser for quantum dots
• Towards Tripartite Hybrid Entanglement in Quantum Dot Molecules
• Single and Few-Particle States in Core-Shell Nanowire Quantum Dots
• Erasing the which-path information of photons