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Time-dependent spin interaction and switching in quantum dot molecule under the adiabatic approximation

Authors
Publisher
Elsevier B.V.
Publication Date
Volume
17
Identifiers
DOI: 10.1016/s1386-9477(02)00814-7
Keywords
  • Spintronic
  • Entanglement
  • Double Quantum Dot
Disciplines
  • Physics

Abstract

Abstract We study a two-electron quantum dot molecule subjected to an uniform magnetic field and in a time-dependent electric field under the adiabatic approximation. The time-dependent spin exchange energy J( t) provides a possible realization for logic gates in quantum computer. Switching between the states is best achieved by the time. As the exchange coupling is tuned by changing the time-dependent electric field, thermal or other types of fluctuations in the experimental environment of system will lead to fluctuations in the exchange, thus causing error in the exchange-based swap gate, which is crucial for two qubit operations. We study the fluctuation effects on the exchange.

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