Polarization entanglement and qubit error rate dependence on the exciton-phonon coupling in self-assembled quantum dots

• URL: http://arxiv.org/abs/2502.03413v3
• Date: Tue, 29 Apr 2025 11:41:29 GMT
• Title: Polarization entanglement and qubit error rate dependence on the exciton-phonon coupling in self-assembled quantum dots
• Authors: Urmimala Dewan, Parvendra Kumar, Amarendra K. Sarma,
• Abstract summary: A near-unity degree of polarization entanglement is essential to minimize qubit error rates in key distribution.<n>This study theoretically investigates the polarization entangled photon pairs produced by a quantum-dot radiative cascade.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Polarization-entangled photons are the key ingredients of various protocols in quantum computation and quantum key distribution. A near-unity degree of polarization entanglement is essential to minimize qubit error rates in key distribution. This study theoretically investigates the polarization entangled photon pairs produced by a quantum-dot radiative cascade located within a micropillar cavity. To incorporate the unavoidable exciton-phonon coupling in a quantum dot-cavity system, we develop a polaron master equation theory and investigate how it affects the degree of entanglement and qubit error rate. We derive analytical expressions of various phonon-induced incoherent rates and demonstrate that one-photon incoherent rates predominate, substantially diminishing the degree of entanglement. It is shown that at elevated temperatures, the role of cavity-mediated effects such as cross-coupling between exciton states, ac-Stark shift, and multiphoton emission gets reduced owing to the phonon-mediated renormalization of the cavity coupling and Rabi frequency. Finally, we consider a BBM92 quantum key distribution protocol and show the evolution of qubit error rate at elevated temperatures of the phonon bath.

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