Accuracy of the Quantum Regression Theorem for Photon Emission from a Quantum Dot
M. Cosacchi, Tim Seidelmann, Moritz Cygorek, A. Vagov, Doris E. Reiter, V. M. Axt
Abstract
The quantum regression theorem (QRT) is the most widely used tool for calculating multitime correlation functions for the assessment of quantum emitters. It is an approximate method based on a Markov assumption for environmental coupling. In this Letter we quantify properties of photons emitted from a single quantum dot coupled to phonons. For the single-photon purity and the indistinguishability, we compare numerically exact path-integral results with those obtained from the QRT. It is demonstrated that the QRT systematically overestimates the influence of the environment for typical quantum dots used in quantum information technology.
Topics & Concepts
Quantum dotPhysicsPhotonQuantum mechanicsQuantumCoupling (piping)Path integral formulationQuantum correlationQuantum opticsOpen quantum systemStatistical physicsQuantum discordMaterials scienceMetallurgySemiconductor Quantum Structures and DevicesQuantum Information and CryptographyAdvancements in Semiconductor Devices and Circuit Design