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

Titelangaben

Cosacchi, Michael ; Wiercinski, Julian ; Seidelmann, Tim ; Cygorek, Moritz ; Vagov, Alexei ; Reiter, Doris E. ; Axt, Vollrath Martin:
On-demand generation of higher-order Fock states in quantum-dot-cavity systems.
In: Physical Review Research. Bd. 2 (2020) Heft 3 . - 033489.
ISSN 2643-1564
DOI: https://doi.org/10.1103/PhysRevResearch.2.033489

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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%.