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Quantum Maxwell's Demon in Thermodynamic Cycles
Quantum Physics · Submitted 14 Sep 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This observation reveals that the role of the MD essentially is to drive the whole work substance being off equilibrium, or equivalently working with an effective temperature difference.
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The abstract, sentence by sentence
We study the physical mechanism of Maxwell's Demon (MD) helping to do extra work in thermodynamic cycles, by describing measurement of position, insertion of wall and information erasing of MD in a quantum mechanical fashion. The heat engine is exemplified with one molecule confined in an infinitely deep square potential inserted with a movable solid wall, while the MD is modeled as a two-level system (TLS) for measuring and controlling the motion of the molecule. It is discovered that the the MD with quantum coherence or on a lower temperature than that of the heat bath of the particle would enhance the ability of the whole work substance formed by the system plus the MD to do work outside. This observation reveals that the role of the MD essentially is to drive the whole work substance being off equilibrium, or equivalently working with an effective temperature difference. The elaborate studies with this model explicitly reveal the effect of finite size off the classical limit or thermodynamic limit, which contradicts the common sense on Szilard heat engine (SHE). The quantum SHE's efficiency is evaluated in detail to prove the validity of second law of thermodynamics.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We study the physical mechanism of Maxwell's Demon (MD) helping to do extra work in thermodynamic cycles, by describing measurement of position, insertion of wall and information erasing of MD in a quantum mechanical fashion. | contribution 0.94 | 0.87 | 0.06 | asserted 0.93 |
| s1 | The heat engine is exemplified with one molecule confined in an infinitely deep square potential inserted with a movable solid wall, while the MD is modeled as a two-level system (TLS) for measuring and controlling the motion of the molecule. | method 0.99 | 0.62 | 0.04 | asserted 0.99 |
| s2 | It is discovered that the the MD with quantum coherence or on a lower temperature than that of the heat bath of the particle would enhance the ability of the whole work substance formed by the system plus the MD to do work outside. | result 1.00 | 0.91 | 0.43 | asserted 0.99 |
| s3 | This observation reveals that the role of the MD essentially is to drive the whole work substance being off equilibrium, or equivalently working with an effective temperature difference. | interpretation 1.00 | 0.77 | 0.53 | asserted 0.99 |
| s4 | The elaborate studies with this model explicitly reveal the effect of finite size off the classical limit or thermodynamic limit, which contradicts the common sense on Szilard heat engine (SHE). | result 0.92 | 0.88 | 0.11 | asserted 1.00 |
| s5 | The quantum SHE's efficiency is evaluated in detail to prove the validity of second law of thermodynamics. | result 0.65 | 0.89 | 0.20 | asserted 1.00 |
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The paper
Original abstract
We study the physical mechanism of Maxwell's Demon (MD) helping to do extra work in thermodynamic cycles, by describing measurement of position, insertion of wall and information erasing of MD in a quantum mechanical fashion. The heat engine is exemplified with one molecule confined in an infinitely deep square potential inserted with a movable solid wall, while the MD is modeled as a two-level system (TLS) for measuring and controlling the motion of the molecule. It is discovered that the the MD with quantum coherence or on a lower temperature than that of the heat bath of the particle would enhance the ability of the whole work substance formed by the system plus the MD to do work outside. This observation reveals that the role of the MD essentially is to drive the whole work substance being off equilibrium, or equivalently working with an effective temperature difference. The elaborate studies with this model explicitly reveal the effect of finite size off the classical limit or thermodynamic limit, which contradicts the common sense on Szilard heat engine (SHE). The quantum SHE's efficiency is evaluated in detail to prove the validity of second law of thermodynamics.
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What it cites · 3 sentences without a confident label
Compares with 1 paper
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In the isothermal process, the work done by the outside agent can be expressed as $W_ins=ΔU_ins-TΔS_ins$, with the internal energy change [equation] and the total entropy change [equation] During this isothermal process, the work done by outside just compensates the change of the free energy as [equation] The same result has been obtained in Ref. [ref] .
Quantum Szilard Engine · Step1: Quantum Insertion (I-II) · 0.87
Cites as background 1 paper
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There are many attempts to generalize the SHE by quantum mechanically approaching the measurement process [ref] , the motion control [ref] , the insertion and the expansion process [ref] .
Quantum Szilard Engine · Introduction · 0.86
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