Temperature dependence of long coherence times of oxide charge qubits

A. Dey, S. Yarlagadda

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4 Scopus citations


The ability to maintain coherence and control in a qubit is a major requirement for quantum computation. We show theoretically that long coherence times can be achieved at easily accessible temperatures (such as boiling point of liquid helium) in small (i.e., ∼10 nanometers) charge qubits of oxide double quantum dots when only optical phonons are the source of decoherence. In the regime of strong electron-phonon coupling and in the non-adiabatic region, we employ a duality transformation to make the problem tractable and analyze the dynamics through a non-Markovian quantum master equation. We find that the system decoheres after a long time, despite the fact that no energy is exchanged with the bath. Detuning the dots to a fraction of the optical phonon energy, increasing the electron-phonon coupling, reducing the adiabaticity, or decreasing the temperature enhances the coherence time.

Original languageEnglish
Article number3487
JournalScientific Reports
Issue number1
StatePublished - 1 Dec 2018
Externally publishedYes

ASJC Scopus subject areas

  • General


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