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

T. Seidelmann, M. Cosacchi, M. Cygorek, D. E. Reiter, A. Vagov, and V. M. Axt
Phys. Rev. B 107, 075301 – Published 15 February 2023

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.

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  • Received 10 May 2022
  • Revised 16 December 2022
  • Accepted 30 January 2023

DOI:https://doi.org/10.1103/PhysRevB.107.075301

©2023 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyAtomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

T. Seidelmann1,*, M. Cosacchi1, M. Cygorek2, D. E. Reiter3,†, A. Vagov1, and V. M. Axt1

  • 1Lehrstuhl für Theoretische Physik III, Universität Bayreuth, 95440 Bayreuth, Germany
  • 2Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • 3Institut für Festkörpertheorie, Universität Münster, 48149 Münster, Germany

  • *tim.seidelmann@uni-bayreuth.de
  • Present address: Condensed Matter Theory, Department of Physics, TU Dortmund, 44221 Dortmund, Germany.

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Issue

Vol. 107, Iss. 7 — 15 February 2023

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