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Comparison of different concurrences characterizing photon pairs generated in the biexciton cascade in quantum dots coupled to microcavities
We compare three different notions of concurrence to measure the polarization entanglement of two-photon states generated by the biexciton cascade in a quantum dot embedded in a microcavity. We focus
Phonon-Induced Enhancement of Photon Entanglement in Quantum Dot-Cavity Systems.
It is demonstrated that phonons can cause a degree of entanglement that even surpasses the corresponding value for the phonon-free case in the quantum dot-cavity system that demand revisiting the role of phonons.
From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity
We investigate the degree of entanglement quantified by the concurrence of photon pairs that are simultaneously emitted in the biexciton-exciton cascade from a quantum dot in a cavity. Four
On-demand generation of higher-order Fock states in quantum-dot–cavity systems
The on-demand preparation of higher-order Fock states is of fundamental importance in quantum information sciences. We propose and compare different protocols to generate higher-order Fock states in
Swing-Up of Quantum Emitter Population Using Detuned Pulses
Thomas K. Bracht,1 Michael Cosacchi,2 Tim Seidelmann,2 Moritz Cygorek,3 Alexei Vagov,2, 4 V. Martin Axt,2 Tobias Heindel,5 and Doris E. Reiter1 Institut für Festkörpertheorie, Universität Münster,
Time-dependent switching of the photon entanglement type using a driven quantum emitter–cavity system
The cascaded decay in a four-level quantum emitter is a well established mechanism to generate polarization entangled photon pairs, the building blocks of many applications in quantum technologies.
Schrödinger cat states in quantum-dot-cavity systems
A Schrödinger-cat state is a coherent superposition of macroscopically distinguishable quantum states, in quantum optics usually realized as superposition of coherent states. Protocols to prepare
Different Types of Photon Entanglement from a Constantly Driven Quantum Emitter Inside a Cavity
Bell states are the most prominent maximally entangled photon states. In a typical four‐level emitter, like a semiconductor quantum dot, the photon states exhibit only one type of Bell state
Accuracy of the Quantum Regression Theorem for Photon Emission from a Quantum Dot.
It is demonstrated that the QRT systematically overestimates the influence of the environment for typical quantum dots used in quantum information technology.
Optical Stark shift to control the dark exciton occupation of a quantum dot in a tilted magnetic field
When a detuned and strong laser pulse acts on an optical transition, a Stark shift of the corresponding energies occurs. We analyze how this optical Stark effect can be used to prepare and control