Ultimate photon entanglement in biexciton cascade
- URL: http://arxiv.org/abs/2511.05065v1
- Date: Fri, 07 Nov 2025 08:20:12 GMT
- Title: Ultimate photon entanglement in biexciton cascade
- Authors: V. N. Mantsevich, D. S. Smirnov, E. L. Ivchenko,
- Abstract summary: polarization entanglement of photons emitted by semiconductor quantum dots is unavoidably limited by the spin fluctuations of the host lattice nuclei.<n>We develop a theory of entangled photon pair generation by a symmetric quantum dot mediated by a triplet exciton.<n>We argue that this represents the ultimate limit for the generation of entangled photon pairs by semiconductor quantum dots.
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- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The polarization entanglement of photons emitted by semiconductor quantum dots is unavoidably limited by the spin fluctuations of the host lattice nuclei. To overcome this limitation, we develop a theory of entangled photon pair generation by a symmetric colloidal quantum dot mediated by a triplet exciton. We derive general analytical expressions for the concurrence as a function of the hyperfine interaction strength and show that it is intrinsically higher than that in conventional doublet-exciton systems such as self-assembled quantum dots. The concurrence sensitively depends on the shape anisotropy and the strain applied to a nanocrystal. In particular, we uncover a possibility of completely suppressing the detrimental effect of the hyperfine interaction due to the interplay between nanocrystal anisotropy and electron-hole exchange interaction. We argue that this represents the ultimate limit for the generation of entangled photon pairs by semiconductor quantum dots.
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