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Researchers explored controlling quantum entanglement in coupled oscillators using an external sinusoidal perturbation. Entanglement occurs in unstable classical regions, allowing manipulation of quantum information via classical systems.

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Area of Science:

  • Quantum physics
  • Quantum information science
  • Condensed matter physics

Background:

  • Quantum entanglement is crucial for quantum computing and cryptography.
  • Environmental interactions (decoherence) lead to entanglement loss.
  • Controlling entanglement in open quantum systems remains a challenge.

Purpose of the Study:

  • To theoretically investigate the control of quantum entanglement in a system of two coupled oscillators.
  • To explore the use of an external sinusoidal perturbation to manage entanglement.
  • To understand the relationship between classical system stability and quantum entanglement.

Main Methods:

  • Modeling a system of two coupled oscillators interacting with a common heat bath.
  • Introducing time-dependent oscillation frequencies and external sinusoidal perturbations.
  • Analyzing the conditions for entanglement generation and control.

Main Results:

  • Quantum entanglement is achieved precisely in regions where the classical counterpart is unstable.
  • Entanglement is not possible when the classical system is stable.
  • Entanglement swapping between stable and unstable regions is controllable via the external perturbation's amplitude and phase.
  • The entanglement rate correlates with the real part of the Floquet coefficient of the classical system.

Conclusions:

  • External sinusoidal perturbations can effectively control quantum entanglement in coupled oscillators.
  • Quantum information can be manipulated by operating on the classical system's stability.
  • This work offers a novel approach to managing entanglement in open quantum systems.