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.

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

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• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Prospects for Spin-Based Quantum Computing
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
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Cited by in corpus (1)

• Quantum dephasing induced by non-Markovian random telegraph noise