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Quantum adiabatic shortcut heat engine with coupled harmonic oscillator as working medium and design method of its adiabatic shortcut process

A technology of coupled resonance and harmonic oscillator, applied in the design field of quantum adiabatic shortcut heat engine and its adiabatic shortcut process, can solve the problems of power-efficiency antagonism, achieve the effect of increasing power, complete thermodynamic cycle, and overcoming power-efficiency antagonism

Active Publication Date: 2022-05-06
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the ubiquitous power-efficiency antagonism problem in heat engines, and provide a quantum adiabatic shortcut heat engine with a coupled harmonic oscillator as a working medium and a design method for its adiabatic shortcut process

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  • Quantum adiabatic shortcut heat engine with coupled harmonic oscillator as working medium and design method of its adiabatic shortcut process
  • Quantum adiabatic shortcut heat engine with coupled harmonic oscillator as working medium and design method of its adiabatic shortcut process
  • Quantum adiabatic shortcut heat engine with coupled harmonic oscillator as working medium and design method of its adiabatic shortcut process

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Embodiment 1

[0058] Taking the diatomic molecular heat engine as an example, the two atoms in the molecule respectively represent a harmonic oscillator, and the diatomic molecule constitutes a coupled harmonic oscillator. We drive such a diatomic molecule to complete a thermodynamic cycle with an adiabatic shortcut process, including four processes of isovolumic heat absorption, adiabatic shortcut expansion, isothermal heat release, and adiabatic shortcut compression. The adiabatic shortcut expansion process and the adiabatic shortcut compression process are rapidly driven by the quantum adiabatic shortcut technology, that is, the frequencies of the two atoms are rapidly changed according to the frequency change method we designed, so that one of the frequencies is equal to the initial moment at the end time, and the other A frequency is less (expansion process) or greater (compression process) than the initial frequency at the end time. Taking the adiabatic shortcut expansion process as a...

Embodiment 2

[0064] Taking the optomechanical heat engine as an example, the photons in the resonant cavity and the phonons in the mechanical oscillator correspond to the two harmonic oscillators in the coupled harmonic oscillator. External photons are injected into the resonant cavity to complete the heat absorption process, and the mechanical vibrator transfers mechanical energy outward to complete the heat release process. Between endothermic and exothermic processes, the interconversion process of photons and phonons constitutes an adiabatic process. In the present invention, we have accelerated this adiabatic process with quantum adiabatic shortcut technology, that is, accelerated the mutual conversion of photons and phonons. In this process, the final frequency of the photon is equal to the initial frequency of the phonon, and the initial frequency of the phonon is equal to the final frequency of the photon. Therefore, the boundary conditions appear symmetric. Under such boundary c...

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Abstract

The invention discloses a quantum adiabatic shortcut heat engine using a coupled harmonic oscillator as a working medium and a design method of the adiabatic shortcut process. The heat engine uses the coupled harmonic oscillator as the working medium, and realizes the thermodynamic cycle of the heat engine through four processes of equal-volume heat absorption, adiabatic shortcut expansion, constant-volume heat release, and adiabatic shortcut compression. The adiabatic shortcut expansion process and the adiabatic shortcut compression process are adiabatic shortcut processes, which are used to replace the adiabatic process in the traditional heat engine. With the help of the anti-control method based on Lewis-Riesenfeld quantum invariants, an adiabatic shortcut is designed for the eigenfrequency of the coupled harmonic oscillator, and then the adiabatic shortcut process of the frequency change of the coupled harmonic oscillator is obtained by using the transformation relationship between the eigenfrequency and the bare frequency. Using the invention to drive the heat engine to complete the adiabatic stroke of the thermodynamic cycle increases the power more than 5 times. Compared with traditional heat engines, this heat engine does not reduce efficiency while increasing power, thus overcoming the problem of power-efficiency antagonism.

Description

technical field [0001] The invention belongs to the field of quantum control, and in particular relates to a quantum adiabatic shortcut heat engine using a coupled harmonic oscillator as a working medium and a design method for the adiabatic shortcut process thereof. Background technique [0002] With the development of quantum technologies such as quantum information, quantum measurement, quantum computing, and quantum communication, how to analyze the thermodynamic properties of quantum devices has become an urgent and thorny problem. As a platform for analyzing the thermodynamic properties of quantum devices, quantum heat engines have attracted the interest of many researchers. Improving the thermodynamic properties of quantum heat engines and improving the power and efficiency of heat engines not only has important theoretical significance, but also has huge application value. [0003] In conventional thermodynamics, if a thermodynamic cycle is performed quasi-statically...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03H3/00
CPCF03H3/00
Inventor 杨冠卓刘松岩
Owner SHANGHAI UNIV
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