Tunneling-induced transparency and Autler-Townes splitting in a triple quantum dot

TL;DR

This paper theoretically explores tunneling-induced transparency and Autler-Townes splitting phenomena in a triple quantum dot system, revealing how tunneling strength and detuning influence optical properties relevant for quantum technologies.

Contribution

It provides a detailed theoretical analysis of TIT and AT effects in triple quantum dots, highlighting the transition from transparency to splitting with varying tunneling regimes and detunings.

Findings

TIT causes a transparency dip in weak tunneling, no anticrossing.

Strong tunneling leads to AT splitting with double anticrossings.

Off-resonance, a detuning-dependent double TIT and AT triplet are observed.

Abstract

We theoretically investigate the tunneling-induced transparency (TIT) and the Autler-Townes (AT) doublet and triplet in a triple-quantum-dot system. For the resonant tunneling case, we show that the TIT induces a transparency dip in a weak-tunneling regime and no anticrossing occurs in the eigenenergies of the system Hamiltonian. However, in a strong-tunneling regime, we show that the TIT evolves to the AT splitting, which results in a well-resolved doublet and double anticrossings. For the off-resonance case, we demonstrate that, in the weak-tunneling regime, the double TIT is realized with a new detuning-dependent dip, where the anticrossing is also absent. In the strong-tunneling regime, the AT triplet is realized with triple anticrossings and a wide detuning-dependent transparency window by manipulating one of the energy-level detunings. Our results can be applied to quantum measurement and quantum-optics devices in solid systems.