# Open quantum system description of singlet-triplet qubits in quantum dots

## TL;DR

This paper presents a theoretical model for the dissipative dynamics of singlet-triplet qubits in GaAs quantum dots, emphasizing the effects of noise and two-qubit interactions on entanglement.

## Contribution

It introduces a quantum open system model incorporating random telegraph noise to simulate 1/f noise and analyzes how noise parameters and coupling influence entanglement decay.

## Key findings

- RTN simulates 1/f noise affecting qubit coherence
- Two-qubit coupling and preparation time significantly impact entanglement dynamics
- Model aligns with experimental concurrence data

## Abstract

We develop a theoretical model to describe the dissipative dynamics of singlet-triplet qubits in GaAs quantum dots. Using the concurrence experimentally obtained [M. D. Shulman et al., Science 336, 202 (2012)] as a guide, we found that each logical qubit fluctuates under the action of a random telegraph noise (RTN) that simulates the $1/f^\alpha$ noise. We also study the dynamics of concurrence as a function of the amplitude of the RTN, the correlation time of the RTN, the preparation time of states, and the two-qubit coupling. Furthermore, we show that the two-qubit coupling together with the preparation time strongly affect the entanglement dissipative dynamics and both physical quantities can be employed to enhance the entanglement between singlet-triplet qubits.