Boosting energy-time entanglement using coherent time-delayed feedback
Kisa Barkemeyer, Marcel Hohn, Stephan Reitzenstein, and Alexander, Carmele
TL;DR
This paper introduces a method to enhance energy-time entanglement visibility in photon pairs by using a coherent time-delayed feedback mechanism, supported by non-Markovian dynamics simulations.
Contribution
It presents a novel feedback control approach to improve entanglement visibility, demonstrated through matrix product state simulations of a three-level quantum system.
Findings
Visibility can be significantly increased with feedback control
Slowing decay of the upper level enhances entanglement
Method applicable over a wide range of parameters
Abstract
The visibility of the two-photon interference in the Franson interferometer serves as a measure of the energy-time entanglement of the photons. We propose to control the visibility of the interference in the second-order coherence function by implementing a coherent time-delayed feedback mechanism. Simulating the non-Markovian dynamics within the matrix product state framework, we find that the visibility for two photons emitted from a three-level system (3LS) in ladder configuration can be enhanced significantly for a wide range of parameters by slowing down the decay of the upper level of the 3LS.
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