Open quantum system description of singlet-triplet qubits in quantum dots
We develop a theoretical model to describe the dissipative dynamics of singlet-triplet qubits in GaAs quantum dots. Using the concurrence experimentally obtained [Shulman, Science 336, 202 (2012)]SCIEAS0036-807510.1126/science.1217692 as a guide, we assume that each logical qubit fluctuates under th...
| Autores: | ; ; |
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| Tipo de documento: | Artículo |
| Estado: | Published version |
| Fecha de publicación: | 2016 |
| País: | Brasil |
| Institución: | UNESP |
| Repositorio: | Repositório Institucional da UNESP |
| Lenguaje: | Inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/169307 |
| Acceso en línea: | http://dx.doi.org/10.1103/PhysRevB.94.235433 http://hdl.handle.net/11449/169307 |
| Nivel de acceso: | Acceso abierto |
| Sumario: | We develop a theoretical model to describe the dissipative dynamics of singlet-triplet qubits in GaAs quantum dots. Using the concurrence experimentally obtained [Shulman, Science 336, 202 (2012)]SCIEAS0036-807510.1126/science.1217692 as a guide, we assume that each logical qubit fluctuates under the action of a random telegraph noise (RTN) that simulates the 1/fα 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. |
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