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Researchers demonstrate a new framework for controlling open quantum systems by accounting for drive-induced environmental interactions. This approach enables precise control over quantum states and gates, even under dissipative conditions, advancing quantum technologies.

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Area of Science:

  • Quantum Physics
  • Quantum Information Science
  • Thermodynamics

Background:

  • Controlling open quantum systems is crucial for quantum technologies.
  • Existing methods often neglect the impact of control drives on system-environment interactions.

Purpose of the Study:

  • To develop a thermodynamically consistent framework for open quantum system control.
  • To incorporate control-dependent dissipation into dynamical equations.
  • To demonstrate control over quantum gates and state transformations.

Main Methods:

  • Developed a theoretical framework incorporating drive-modified system-environment interactions.
  • Incorporated control-dependent dissipation into quantum dynamical equations.
  • Analyzed entropy-changing state-to-state transformations (heating/cooling).
  • Demonstrated control of nonunitary and unitary quantum gates.

Main Results:

  • Established a key relation for open-system control via control-dependent dissipation.
  • Achieved control over entropy-changing transformations.
  • Successfully controlled nonunitary reset maps with complete memory loss.
  • Identified a mechanism for controlling unitary gates by entropy removal.
  • Demonstrated a universal set of single- and double-qubit unitary gates under dissipation.

Conclusions:

  • The developed framework provides a robust method for controlling open quantum systems.
  • Control-dependent dissipation is a key element for effective open-system control.
  • This work advances the realization of quantum computation and information processing under realistic dissipative conditions.