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

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.

arXiv comment5 pages, 6 figures. Very close to the published version. arXiv admin note: substantial text overlap with arXiv:1503.08673

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Cited by in corpus (5)

• Quantum dephasing induced by non-Markovian random telegraph noise
• Effects of charge noise on a pulse-gated singlet-triplet $S-T_{-}$ qubit
• Application of the Landau-Zener-Stueckelberg-Majorana dynamics in an electrically driven flip of a hole spin
• Non-Markovian memory in a measurement-based quantum computer
• Spin-qubit noise spectroscopy from randomized benchmarking by supervised learning