Entanglement on demand through time reordering

Abstract

Entangled photons can be generated "on demand" in a novel scheme involving unitary time reordering of the photons emitted in a radiative decay cascade. The scheme yields polarization entangled photon pairs, even though prior to reordering the emitted photons carry significant "which path information" and their polarizations are unentangled. This shows that quantum chronology can be manipulated in a way that is lossless and deterministic (unitary). The theory can, in principle, be tested and applied to the biexciton cascade in semiconductor quantum dots.

4 pages, 4 figures

References in corpus (4)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Improved fidelity of triggered entangled photons from single quantum dots
• Manipulating exciton fine-structure in quantum dots with a lateral electric field
• Distilling entanglement from cascades with partial "Which Path" ambiguity

Cited by in corpus (4)

• A photonic cluster state machine gun
• Theory of excitons in cubic III-V semiconductor GaAs, InAs and GaN quantum dots: fine structure and spin relaxation
• Entangled photon pairs from a quantum dot cascade decay: the effect of time-reordering
• Nonclassical Correlation of Polarization Entangled Photons in a Biexciton-Exciton Cascade