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Fractional Control Gate Protocols for Quantum Engines.

Elliot John Fox1, Taysa Mendes de Mendonça2, Ferdinand Schmidt-Kaler3

  • 1School of Physics, Engineering and Technology, University of York, York YO10 5DD, UK.

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Summary
This summary is machine-generated.

Nth-root gates enhance quantum heat engine performance by leveraging quantum coherence. This method achieves high work extraction efficiency, up to 100%, by imprinting coherence into qubits.

Keywords:
quantum computationquantum heat enginequantum protocolsquantum thermodynamicswork

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Area of Science:

  • Quantum Computing
  • Quantum Thermodynamics
  • Quantum Information Science

Background:

  • Quantum heat engines offer a novel approach to energy conversion at the quantum level.
  • Controlling quantum systems with precision is crucial for harnessing their potential in thermodynamic processes.

Purpose of the Study:

  • To investigate the application of Nth-root gates in quantum thermodynamic protocols.
  • To analyze the impact of quantum coherence on the performance of a quantum heat engine.
  • To compare different circuit designs for optimizing work production and efficiency.

Main Methods:

  • Utilized Nth-root gates for controlled two-qubit operations within quantum thermodynamic protocols.
  • Designed and compared two- and three-qubit circuits for a quantum heat engine.
  • Assessed maximum work production and efficiency, considering quantum coherence as a key parameter.

Main Results:

  • Quantum coherence in qubits significantly boosts maximum work production and engine efficiency across various circuits.
  • A novel protocol using fractional control gates achieved 84% to 100% work extraction efficiency.
  • A strong linear correlation was found between work production and many-body correlations generated by the gates.

Conclusions:

  • Nth-root gates are effective for paced quantum operations in thermodynamic protocols.
  • Imprinting quantum coherence into qubits is a key strategy for enhancing quantum heat engine performance.
  • Fractional control gates offer a highly efficient method for work extraction in quantum systems.