Quantum Otto thermal machines powered by Kerr nonlinearity

Mendes, Udenys Cabral; Sales, José S.; Almeida, N. G. de

doi:10.1088/1361-6455/ac291a

Cited by 5 publications

(4 citation statements)

References 37 publications

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“…It is worth noting that the enhancement observed in efficiency and COP was also observed in [76,77]. In [77] the role of anharmonicity on COP has been investigated.…”

Section: Discussionmentioning

confidence: 91%

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Enhancing the performance of coupled quantum Otto thermal machines without entanglement and quantum correlations

Makouri

Slaoui

Daoud³

2023

J. Phys. B: At. Mol. Opt. Phys.

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We start with a revision study of two coupled spin-1/2 under the inﬂuence of Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interaction and a magnetic ﬁeld. We ﬁrst show the role of idle levels, i.e., levels that do not couple to the external magnetic ﬁeld, when the system is working as a heat engine as well as when it is a refrigerator. Then we extend the results reported in [PRE. 92, (2015) 022142] by showing that it is not necessary to change both the magnetic ﬁeld as well as the coupling parameters to break the extensive property of the work extracted globally from two coupled spin-1/2 as has been demonstrated there. Then we study the role of increasing the number of coupled spins on efﬁciency, extractable work, and coefﬁcient of performance (COP). First, we consider two- and three-coupled spin-1/2 Heisenberg XXX-chain. We prove that the latter can outperform the former in terms of efﬁciency, extractable work, and COP. Then we consider the Ising model, where the number of interacting spins ranges from two to six. We show that only when the number of interacting spins is odd the system can work as a heat engine in the strong coupling regime. The enhancements in efﬁciency and COP are explored in detail. Finally, this model conﬁrms the idea that entanglement and quantum correlations are not the reasons behind the advantages observed in efﬁciency, extracatable work, and COP, but only due to the structure of the energy levels of the Hamiltonian of the working substance. In addition to this, the extensive property of global work as well, is not affected by entanglement and quantum correlations.

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“…It is worth noting that the enhancement observed in efficiency and COP was also observed in [76,77]. In [77] the role of anharmonicity on COP has been investigated.…”

Section: Discussionmentioning

confidence: 91%

“…when J z = 0. In [76], the role of Kerr-nonlinearity on efficiency and COP has been studied in detail, showing that Kerr-nonlinearity could boost them above the ones of Otto. To resume, our work supports the idea that the enhancement in the performance of coupled spins is only a matter of the structure of the Hamiltonian.…”

Section: Discussionmentioning

confidence: 99%

Enhancing the performance of coupled quantum Otto thermal machines without entanglement and quantum correlations

Makouri

Slaoui

Daoud³

2023

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

show abstract

“…It is worth noting that the advantage observed in efficiency and COP was also observed in refs. [74,75]. In Ref.…”

Section: Discussionmentioning

confidence: 99%

“…In Ref. [74], the role of Kerr-nonlinearity on efficiency and COP has been studied in detail, showing that Kerr-nonlinearity could boost them above the ones of Otto. To resume, our work supports the idea that the advantage in the performance of coupled spins is only a matter of the structure of the Hamiltonian.…”

Section: Discussionmentioning

confidence: 99%

Enhancing the performance of coupled quantum Otto thermal machines without entanglement and quantum correlations

Makouri¹,

Slaoui²,

Daoud³

2022

Preprint

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We start with a revision study of two coupled spin-1/2 under the influence of KSEA interaction and a magnetic field. We first show the role of idel levels, i.e., levels that do not couple to the external magnetic field, when the system is working as a heat engine as well as when it is a refrigerator. Then we point out a flaw in [PRE. 92, (2015) 022142] by showing that it is not necessary to change both the magnetic field as well as the coupling parameters to break the extensive property of the work extracted globally from two coupled spin-1/2 as has been demonstrated there. Then we study the role of increasing the number of coupled spins on efficiency, extractable work, and coefficient of performance (COP). First, we consider two-and three-coupled spin-1/2 Heisenberg XXX-chain. We prove that the latter can outperform the former in terms of efficiency, extractable work, and COP. Then we consider the Ising model, where the number of interacting spins ranges from two to six. We show that only when the number of interacting spins is odd the system can work as a heat engine in the strong coupling regime. The enhancements in efficiency and COP are explored in detail. Finally, this model confirms the idea that entanglement and quantum correlations are not the reasons behind the advantages observed in efficiency, extracatable work, and COP, but only due to the structure of the energy levels of the Hamiltonian of the working substance.

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