Phonon-induced transition between entangled and nonentangled photon emission in constantly driven quantum-dot--cavity systems

Abstract

Entangled photon pairs are essential for many applications in quantum technologies. Recent theoretical studies demonstrated that different types of entangled Bell states can be created in a constantly driven four-level quantum emitter-cavity system. Unlike other candidates for the realization of the four-level emitter, semiconductor quantum dots unavoidably interact with their environment, resulting in carrier-phonon interactions. Surprisingly, phonons change the entanglement of emitted photon pairs in a qualitative way, already at low temperatures on the order of 4 K. While one type of Bell state can still be generated using small driving strengths, the other type is suppressed due to phonon interactions in strongly-confined quantum dots. The degree of entanglement decreases with rising temperature and driving strength until it vanishes at a certain parameter value. Because it remains zero afterward, we encounter a phonon-induced transition between entangled and nonentangled photon emission that resembles a phase transition. The transition occurs at temperatures below 30 K and, independent of the driving strength, the concurrence as a function of the reduced temperature is found to obey a power law with exponent one near the transition point.

15 pages, 7 figures

References in corpus (18)

• Secure Quantum Key Distribution
• Entangled Photon Pairs from Semiconductor Quantum Dots
• A solid-state entangled photon pair source with high brightness and indistinguishability
• On-demand semiconductor source of entangled photons which simultaneously has high fidelity, efficiency, and indistinguishability
• Improved fidelity of triggered entangled photons from single quantum dots
• Electric-field-induced coherent coupling of the exciton states in a single quantum dot
• Evolution of entanglement within classical light states
• Resonant nature of phonon-induced damping of Rabi oscillations in quantum dots
• Phonon-assisted robust and deterministic two-photon biexciton preparation in a quantum dot
• The role of phonons for exciton and biexciton generation in an optically driven quantum dot
• Quantum-tomography of entangled photon pairs by quantum-dot cascade decay
• Non-Markovian features in semiconductor quantum optics: Quantifying the role of phonons in experiment and theory
• 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
• Continuous Dissipative Phase Transitions without Symmetry Breaking
• From strong to weak temperature dependence of the two-photon entanglement resulting from the biexciton cascade inside a cavity
• Different types of photon entanglement from a constantly driven quantum emitter inside a cavity
• Time-dependent switching of the photon entanglement type using a driven quantum emitter-cavity system

Cited by in corpus (2)

• Two-photon excitation with finite pulses unlocks pure dephasing-induced degradation of entangled photons emitted by quantum dots
• Dissipative stabilization of maximal entanglement between non-identical emitters via two-photon excitation