Quantum-enhanced finite-time Otto cycle

Das, Arpan; Mukherjee, Victor

doi:10.1103/physrevresearch.2.033083

Cited by 51 publications

(40 citation statements)

References 68 publications

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“…Note that thermalization under some non-Markovian open quantum system dynamics, turns out to be a resource for achieving better performance of some quantum heat engines (see, for example, ref. [53,54]). Now, to see how fast the homogenization occurs comapred to the Markovian or the non-Markovian scenario with PSWAP, we provide some plots for a set of different system and ancilla states.…”

Section: B Second and Final Stepmentioning

confidence: 99%

Quantum homogenization in non-Markovian collisional model

Saha¹,

Das²,

Ghosh³

2022

Preprint

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Collisional models are a category of microscopic framework designed to study open quantum systems. The framework involves a system sequentially interacting with a bath comprised of identically prepared units. In this regard, quantum homogenization is a process where the system state approaches the identically prepared state of bath unit in the asymptotic limit. Here, we study the homogenization process for non-Markovian collisional model generated via additional bath-bath interaction. With partial swap operation as both system-bath and bath-bath unitary, we show that homogenization is achieved irrespective of the initial states of the system or bath units. This is reminiscent of the Markovian scenario, where partial swap is the unique operation for a universal quantum homogenizer. On the other hand, we observe that the rate of homogenization is slower than its Markovian counter part. Interestingly, a different choice of bath-bath unitary speeds up the homogenization process but loses the universality being dependent on the initial states of the bath units.

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Section: B Second and Final Stepmentioning

confidence: 99%

Quantum homogenization in non-Markovian collisional model

Saha¹,

Das²,

Ghosh³

2022

Preprint

Self Cite

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“…[ 15–18 ] Compared with conventional luminescent materials, such as organic dyes and semiconductor quantum dots, Cu NCs possess advantages of ultra‐small size combined with reasonable photostability, large Stokes shift, and long emission lifetimes. [ 19,20 ] However, their PL quantum yields (QY) are still not competitive with those conventional luminescent materials, and their wider applications have been limited by poor stability caused by the easy oxidation of Cu. [ 13,15,21 ] Fortunately, the aggregation‐induced emission (AIE) phenomenon has provided a powerful approach to enhance the emission efficiency (and to some extent improve the stability) of Cu NCs.…”

Section: Introductionmentioning

confidence: 99%

“…The review starts with a summary on the current understanding of PL mechanisms of Cu NCs and proceeds with the analysis of contributions of Cu metalcore and organic ligands to AIE‐related properties. Note that we do not consider in detail practical applications of Cu NC AIEgens, as those are already available in a number of topical reviews, [ 13,14,19,20 ] but some examples of those are provided. We end this review by offering some concluding remarks and our own perspective on the active field of AIE of Cu NCs, with a hope to promote further research on the fundamental aspects of this useful phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Aggregation‐induced emission of copper nanoclusters

Shi

Feng

et al. 2021

Aggregate

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Copper nanoclusters (Cu NCs) have recently emerged as promising luminophores, featuring ultra‐small size, reasonable photostability, large Stokes shift, and long emission lifetimes. Aggregation‐induced emission (AIE) has been often used to further improve both the emission intensity and stability of these clusters, with plenty of potential applications in the fields of chemical sensing and bioimaging. This review starts with a summary of the current understanding of emission mechanisms of Cu NCs and proceeds with the analysis of contributions from the Cu metal core and the organic ligands. We summarize the recent research progress on the design of ligands, and the ways on how to induce aggregation of the Cu NCs through electrostatic charge neutralization, host‐guest interactions, and the use of templates. We also discuss the current understanding of emission mechanisms of Cu NCs experiencing AIE, such as the often‐cited restriction of intramolecular motion and contributions from Cu(I) molecular complexes. We finish this review by providing concluding remarks and offering our own perspective on the active field of AIE of Cu NCs, with a hope to further promote the research on the fundamental aspects of this useful phenomenon.

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“…Finite time thermodynamic cycles [ 31 , 33 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 ] and the study of open quantum systems [ 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 ] have drawn significant attention in the recent years. These studies aim to arrive at more practical estimates of the performance measures for these machines.…”

Section: Introductionmentioning

confidence: 99%

Quantum Heat Engines with Complex Working Media, Complete Otto Cycles and Heuristics

Johal

Mehta

2021

Entropy

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Quantum thermal machines make use of non-classical thermodynamic resources, one of which include interactions between elements of the quantum working medium. In this paper, we examine the performance of a quasi-static quantum Otto engine based on two spins of arbitrary magnitudes subject to an external magnetic field and coupled via an isotropic Heisenberg exchange interaction. It has been shown earlier that the said interaction provides an enhancement of cycle efficiency, with an upper bound that is tighter than the Carnot efficiency. However, the necessary conditions governing engine performance and the relevant upper bound for efficiency are unknown for the general case of arbitrary spin magnitudes. By analyzing extreme case scenarios, we formulate heuristics to infer the necessary conditions for an engine with uncoupled as well as coupled spin model. These conditions lead us to a connection between performance of quantum heat engines and the notion of majorization. Furthermore, the study of complete Otto cycles inherent in the average cycle also yields interesting insights into the average performance.

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Quantum-enhanced finite-time Otto cycle

Cited by 51 publications

References 68 publications

Quantum homogenization in non-Markovian collisional model

Quantum homogenization in non-Markovian collisional model

Aggregation‐induced emission of copper nanoclusters

Quantum Heat Engines with Complex Working Media, Complete Otto Cycles and Heuristics

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