Estimations of phonon-induced decoherence in silicongermanium triple quantum dots
The decoherence and dephasing rate of charge qubits in systems based on double and triple SiGe quantum dots are studied. At the short time limit, electronphonon interaction causes an incomplete decay of the off-diagonal density matrix elements. Long-time relaxation decay dominates over dephasing at large times. The triple quantum dot system with the same interdot distance demonstrates lower relaxation rate in the wide range of parameters.
decoherence quantum dots charge qubit quantum computation nanotechnology phonons