From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity

Abstract

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 dot-cavity configurations are compared that differ with respect to the detuning between the cavity modes and the quantum dot transitions, corresponding to different relative weights of direct two-photon and sequential single-photon processes. The dependence of the entanglement on the exciton fine-structure splitting $\delta$ is found to be significantly different for each of the four configurations. For a finite splitting and low temperatures, the highest entanglement is found when the cavity modes are in resonance with the two-photon transition between the biexciton and the ground state and, in addition, the biexciton has a finite binding energy of a few meV. However, this widely used configuration is rather strongly affected by phonons such that other dot-cavity configurations, that are commonly regarded as less suited for obtaining high degrees of entanglement, become more favorable already at temperatures on the order of 10 K and above. If the cavity modes are kept in resonance with one of the exciton-to-ground-state transitions and the biexciton binding energy is finite, the entanglement drastically drops for positive $\delta$ with rising temperatures when $T$ is below $\simeq$ 4 K, but is virtually independent of the temperature for higher $T$.

14 pages, 6 figures

References in corpus (15)

• Entangled Photon Pairs from Semiconductor Quantum Dots
• Improved fidelity of triggered entangled photons from single quantum dots
• Phonon induced Rabi frequency renormalization of optically driven single InGaAs/GaAs quantum dots
• Magnetic-field-induced reduction of the exciton polarization splitting in InAs quantum dots
• Quantum dot Rabi rotations beyond the weak exciton-phonon coupling regime
• Evolution of entanglement within classical light states
• Resonant nature of phonon-induced damping of Rabi oscillations in quantum dots
• Entangled photon pairs produced by a quantum dot strongly coupled to a microcavity
• Phonon-assisted robust and deterministic two-photon biexciton preparation in a quantum dot
• Quantum-tomography of entangled photon pairs by quantum-dot cascade decay
• Non-Markovian dynamics of double quantum dot charge qubits due to acoustic phonons
• Microscopic theory of phonon-induced effects on semiconductor quantum dot decay dynamics in cavity QED
• Path integral description of combined Hamiltonian and non-Hamiltonian dynamics in quantum dissipative system
• Phonon impact on optical control schemes of quantum dots: The role of quantum dot geometry and symmetry
• Time-resolved pump-probe signals of a continuously driven quantum dot affected by phonons

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• Dressed-state analysis of two-color excitation schemes
• Beyond the four-level model: Dark and hot states in quantum dots degrade photonic entanglement
• Temperature-independent almost perfect photon entanglement from quantum dots via the SUPER scheme
• Signatures of the Optical Stark Effect on Entangled Photon Pairs from Resonantly-Pumped Quantum Dots
• Two-photon excitation with finite pulses unlocks pure dephasing-induced degradation of entangled photons emitted by quantum dots
• Different types of photon entanglement from a constantly driven quantum emitter inside a cavity
• Theory of time-bin entangled photons from quantum emitters
• Time-dependent switching of the photon entanglement type using a driven quantum emitter-cavity system
• Understanding and utilizing the inner bonds of process tensors
• Phonon-induced transition between entangled and nonentangled photon emission in constantly driven quantum-dot--cavity systems