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Phonon-mediated generation of quantum correlations between quantum dot qubits.

Jan Krzywda1, Katarzyna Roszak1

  • 1Department of Theoretical Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Technology, 50-370 Wrocław, Poland.

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|April 2, 2016
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Quantum correlations emerge between two quantum dot qubits interacting with a shared phonon environment. Optimal correlation generation occurs within a specific temperature range, balancing qubit-environment entanglement and dephasing effects.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Quantum dots serve as essential solid-state qubits.
  • Phonon environments can induce decoherence and entanglement in quantum systems.
  • Understanding qubit-environment interactions is crucial for quantum computing.

Purpose of the Study:

  • To investigate the generation of quantum correlations between two excitonic quantum dot qubits.
  • To analyze the role of a common phonon environment in mediating these correlations.
  • To determine the temperature dependence of quantum correlation generation.

Main Methods:

  • Theoretical modeling of two coupled quantum dot qubits.
  • Analysis of exciton-environment interactions, including pure dephasing.
  • Calculation of quantum correlation measures as a function of temperature.

Main Results:

  • Quantum correlations are generated between qubits through interaction with the same phonon environment.
  • A temperature-dependent trade-off behavior is observed in correlation levels.
  • At low temperatures, insufficient qubit-environment entanglement limits correlations; at high temperatures, pure dephasing hinders entanglement-mediated correlations.

Conclusions:

  • Shared phonon environments can mediate quantum correlations between qubits.
  • The efficiency of correlation generation is highly sensitive to temperature.
  • Careful temperature control is necessary to leverage phonon-mediated correlations for quantum information processing.