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

Author(s)

Castelano, L. K. ; Fanchini, F. F. ; Berrada, K.

• Document type: Journal article
• Source: PHYSICAL REVIEW B; v. 94, n. 23, p. 5-pg., 2016-12-23.

Abstract

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(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. (AU)

• FAPESP's process: 15/05581-7 - Quantum control in dissipative systems
• Grantee: Felipe Fernandes Fanchini
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/13052-6 - Transport properties and quantum computation in nanostructures
• Grantee: Leonardo Kleber Castelano
• Support Opportunities: Regular Research Grants