2015/03/31 by L. K. Castelano, F. F. Fanchini, K. Berrada
Computer Science · Physics and Astronomy · #Concurrence #Coupling (piping) #Dissipative system #Excited state #Materials science #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum dot #Quantum entanglement #Quantum mechanics #Qubit #Singlet state #Superconducting quantum computing #quant-ph
paper · pdf · doi:10.1103/physrevb.94.235433
published as Phys. Rev. B 94, 235433 (2016) · This version provides a description of the decoherence mechanism that is completely different from the published version. For a closer version see arXiv: 1701.03169
openalex created_date 2016/06/24 · openalex publication_date 2016/12/23 · arxiv created 2017/01/25 · arxiv updated 2017/01/27 · openalex updated_date 2026/08/05
We develop a theoretical model to describe the dissipative dynamics of singlet-triplet qubits in GaAs quantum dots. Using the concurrence experimentally obtained [Shulman et al., Science 336, 202 (2012)] as a guide, we assume that each logical qubit fluctuates under the action of a random telegraph noise (RTN) that simulates the 1/f^\ensuremathα 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.