Title

Non-Markovian Dynamics Of Double Quantum Dot Charge Qubits Due To Acoustic Phonons

Abstract

We investigate the dynamics of a double quantum dot charge qubit which is coupled to piezoelectric acoustic phonons, appropriate for GaAs heterostructures. At low temperatures, the phonon bath induces the non-Markovian dynamical behavior of the oscillations between the two charge states of the double quantum dot. Upon applying the numerically exact quasiadiabatic propagator path-integral scheme, the reduced density matrix of the charge qubit is calculated, thereby avoiding the Born-Markov approximation. This allows a systematic study of the dependence of the Q factor on the lattice temperature, on the size of the quantum dots, as well as on the interdot coupling. We calculate the Q factor for a recently realized experimental setup and find that it is two orders of magnitudes larger than the measured value, indicating that the decoherence due to phonons is a subordinate mechanism. © 2005 The American Physical Society.

Publication Date

12-15-2005

Publication Title

Physical Review B - Condensed Matter and Materials Physics

Volume

72

Issue

23

Number of Pages

-

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevB.72.235320

Socpus ID

29744465629 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/29744465629

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