• Open Access

On-demand generation of higher-order Fock states in quantum-dot–cavity systems

M. Cosacchi, J. Wiercinski, T. Seidelmann, M. Cygorek, A. Vagov, D. E. Reiter, and V. M. Axt
Phys. Rev. Research 2, 033489 – Published 24 September 2020

Abstract

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 solid state quantum-dot–cavity systems. The protocols make use of a series of laser pulses to excite the quantum dot exciton and off-resonant pulses to control the detuning between dot and cavity. Our theoretical studies include dot and cavity loss processes as well as the pure-dephasing type coupling to longitudinal acoustic phonons in a numerically complete fashion. By going beyond the two-level approximation for quantum dots, we study the impact of a finite exchange splitting, the impact of a higher energetic exciton state, and an excitation with linearly polarized laser pulses leading to detrimental occupations of the biexciton state. We predict that under realistic conditions, a protocol which keeps the cavity at resonance with the quantum dot until the desired target state is reached is able to deliver fidelities to the Fock state |5 well above 40%.

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  • Received 26 June 2020
  • Accepted 1 September 2020

DOI:https://doi.org/10.1103/PhysRevResearch.2.033489

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & OpticalQuantum Information, Science & Technology

Authors & Affiliations

M. Cosacchi1, J. Wiercinski1, T. Seidelmann1, M. Cygorek2, A. Vagov1,3, D. E. Reiter4, and V. M. Axt1

  • 1Theoretische Physik III, Universität Bayreuth, 95440 Bayreuth, Germany
  • 2Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
  • 3ITMO University, St. Petersburg, 197101, Russia
  • 4Institut für Festkörpertheorie, Universität Münster, 48149 Münster, Germany

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Issue

Vol. 2, Iss. 3 — September - November 2020

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