Multiple-State Quantum Carnot Engine

Latifah, Eny; Purwanto, Agus

doi:10.4236/jmp.2011.211169

Cited by 30 publications

(38 citation statements)

References 11 publications

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“…In analogy with classical thermodynamics, a quantum heat engine generates useful mechanical work from heat, by means of a reversible sequence of transformations (trajectories) in Hilbert's space, where the "working substance" is of quantum mechanical nature [1][2][3][4][5][6][7][8][9][10][11]. Several theoretical implementations for a quantum heat engine have been discussed in the literature, such as entangled states in a qubit [12], quantum mechanical versions of the Otto cycle [13,14], and photocells [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Magnetically driven quantum heat engine

Muñoz

Peña

2014

Phys. Rev. E

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We studied the efficiency of two different schemes for a magnetically driven quantum heat engine, by considering as the "working substance" a single non-relativistic particle trapped in a cylindrical potential well, in the presence of an external magnetic field. The first scheme is a cycle, composed of two adiabatic and two iso-energetic reversible trajectories in configuration space. The trajectories are driven by a quasi-static modulation of the external magnetic field intensity. The second scheme is a variant of the former, where the iso-energetic trajectories are replaced by isothermal ones, along which the system is in contact with macroscopic thermostats. This second scheme constitutes a quantum analogue of the classical Carnot cycle.

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Section: Introductionmentioning

confidence: 99%

“…One of the simplest theoretical implementations for a quantum heat engine is a system composed by a singleparticle trapped in a one-dimensional potential well [1][2][3][4]7]. The different trajectories can be driven by a quasi-static deformation of the potential well, by applying an external force [1,2,16].…”

Section: Introductionmentioning

confidence: 99%

Magnetically driven quantum heat engine

Muñoz

Peña

2014

Phys. Rev. E

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“…As an alternative to recover thermal energy in the form of useful work on a nanoscale device, QHENs have been proposed in the literature [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Within the general definition of a QHEN, whose working fluid is of a quantum mechanical nature, it is important to distinguish those that have a reciprocating operation [3,19].…”

Section: Introductionmentioning

confidence: 99%

Magnetically-Driven Quantum Heat Engines: The Quasi-Static Limit of Their Efficiency

Muñoz

Peña

González

2016

Entropy

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Abstract:The concept of a quantum heat engine (QHEN) has been discussed in the literature, not only due to its intrinsic scientific interest, but also as an alternative to efficiently recover, on a nanoscale device, thermal energy in the form of useful work. The quantum character of a QHEN relies, for instance, on the fact that any of its intermediate states is determined by a density matrix operator. In particular, this matrix can represent a mixed state. For a classical heat engine, a theoretical upper bound for its efficiency is obtained by analyzing its quasi-static operation along a cycle drawn by a sequence of quasi-equilibrium states. A similar analysis can be carried out for a quantum engine, where quasi-static processes are driven by the evolution of ensemble-averaged observables, via variation of the corresponding operators or of the density matrix itself on a tunable physical parameter. We recently proposed two new conceptual designs for a magnetically-driven quantum engine, where the tunable parameter is the intensity of an external magnetic field. Along this article, we shall present the general quantum thermodynamics formalism developed in order to analyze this type of QHEN, and moreover, we shall apply it to describe the theoretical efficiency of two different practical implementations of this concept: an array of semiconductor quantum dots and an ensemble of graphene flakes submitted to mechanical tension.

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“…Penelitian tentang mesin panas kuantum telah berkembang pesat [1,2]. Hal dibuktikan dengan publikasi yang cukup banyak akhir-akhir ini.…”

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Mesin Panas Kuantum dengan Sistem Multipartikel dan Multi Keadaan

Sukamto

2015

JFA

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IntisariDalam paper ini, disajikan mesin panas kuantum dengan m-fermion dan p-keadaan pada sumur potensial satu dimensi sebagai medium kerja mesin panas kuantum. Siklus Carnot dilakukan dengan dua proses isoenergi dan dua proses iso-entropi, generalisasi keadaan transisi dilakukan setelah proses iso-energi. Parameter ekspansi yang memaksimalkan output daya dihitung untuk setiap konfigurasi keadaan transisi. Didapatkan pula pasangan antara parameter ekspansi dan konfigurasi keadaan transisi yang memaksimalkan daya output. AbstractIn this paper, we present quantum heat engine with m fermion in p state in one-dimensional potential well as working substance. The Carnot circle is considered, with two iso-energetic process and two iso-entropic process. We consider generalize transition state after iso-energetic process. Then we determine an expansion parameter that maximize power output for each configuration transition state. We also calculate a pair of expansion parameter and configuration of transition state that maximize output power. Pada paper ini, dibahas mesin panas quantum dengan sistem p keadaan dan m partikel. Dapat dikatakan, ini merupakan lanjutan dari pekerjaan Wang [6]. Pemilihan sistem multi keadaan, akan diperoleh lebih dari satu alternatif energi sistem tereksitasi. Kemudian dibandingkan performa mesin panas pada siklus Carnot terhadap pemilihan energi tereksitasi. Setelah itu, ditentukan parameter ekspansi (r) yang menghasilkan performa maksimum untuk setiap energi tereksitasi. Diketahui bahwa setiap energi tereksitasi yang dipilih, akan menghasilkan daya keluaran yang bernilai maksimum pada nilai parameter ekspansi tertentu. Selanjutnya akan ditentukan pasangan energi tereksitasi dan parameter ekspansi yang menghasilkan daya output yang maksimum.Paper ini disusun sebagai berikut, pertama dibahas Carnot Cycle dengan proses isoenergetik awal dari keadaan dasar ke * E-MAIL: herusukamto@physics.its.ac.id † E-MAIL: b anang@physics.its.ac.id keadaan eksitasi pertama, kemudian digeneraliasi keadaan eksitasi dan ditentukan range parameter ekspansi tiap keadaan eksitasi yang dipilih. Selain itu ditentukan keadaan eksitasi yang tepat, agar diperoleh daya output yang maksimum. II. MESIN PANAS KUANTUM MULTI KEADAANIde kunci dari termodinamika kuantum adalah menganalogikan hukum pertama termodinamikadengan diferensiasi energi total sistem kuantum sebagai berikutSedangkan gaya pada dinding diberikan oleh F = -

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Multiple-State Quantum Carnot Engine

Cited by 30 publications

References 11 publications

Magnetically driven quantum heat engine

Magnetically driven quantum heat engine

Magnetically-Driven Quantum Heat Engines: The Quasi-Static Limit of Their Efficiency

Mesin Panas Kuantum dengan Sistem Multipartikel dan Multi Keadaan

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