Entropy production and thermodynamic power of the squeezed thermal reservoir

Manzano, Gonzalo; Galve, Fernando; Zambrini, Roberta; Parrondo, Juan M. R.

doi:10.1103/physreve.93.052120

Cited by 200 publications

(217 citation statements)

References 64 publications

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“…In this larger device the donors are created as a byproduct of a different element in the device. This scheme is very different from other proposals that use "coherent baths" to supply the machine with coherent (non-thermal) fuel ("phasonium" [84,85] and "squeezed baths" [86,87]). In [53] it is assumed that coherence is somehow added to the setup.…”

Section: Coherence Injectionmentioning

confidence: 78%

Coherence-Induced Reversibility and Collective Operation of Quantum Heat Machines via Coherence Recycling

Uzdin

2016

Phys. Rev. Applied

102

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Collective behavior where a set of elements interact and generate effects that are beyond the reach of the individual non interacting elements, are always of great interest in physics. Quantum collective effects that have no classical analogue are even more intriguing. In this work we show how to construct collective quantum heat machines and explore their performance boosts with respect to regular machines. Without interactions between the machines the individual units operate in a stochastic, non-quantum manner. The construction of the collective machine becomes possible by introducing two simple quantum operations: coherence extraction and coherence injection. Together these operations can harvest coherence from one engine and use it to boost the performance of a slightly different engine. For weakly driven engines we show that the collective work output scales quadratically with the number of engines rather than linearly. Eventually, the boost saturates and the scaling becomes linear. Nevertheless, even in saturation, work is still significantly boosted compared to individual operation. To study the reversibility of the collective machine we introduce the 'entropy pollution' measure. It is shown that there is a regime where the collective machine is N times more reversible while producing N times more work, compared to the individual operation of N units. Moreover, the collective machine can even be more reversible than the most reversible unit in the collective. This high level of reversibility becomes possible due to a special symbiotic mechanism between engine pairs.

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Section: Coherence Injectionmentioning

confidence: 78%

Coherence-Induced Reversibility and Collective Operation of Quantum Heat Machines via Coherence Recycling

Uzdin

2016

Phys. Rev. Applied

102

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“…Recently, it was noticed that the entropy production in conventional thermodynamics can be understood as the the correlation generation between an open quantum system and its thermal reservoir [13][14][15][16][17][18][19][20][21][22][23]. For example, for a thermal state [21,24].…”

Section: Introductionmentioning

confidence: 99%

Entropy dynamics of a dephasing model in a squeezed thermal bath

You

2018

Phys. Rev. A

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We study the entropy dynamics of a dephasing model, where a two-level system (TLS) is coupled with a squeezed thermal bath via non-demolition interaction. This model is exactly solvable, and the time dependent states of both the TLS and its bath can be obtained exactly. Based on these states, we calculate the entropy dynamics of both the TLS and the bath, and find that the dephasing rate of the system relies on the squeezing phase of the bath. In zero temperature and high temperature limits, both the system and bath entropy increases monotonically in the coarse grained time scale. Moreover, we find that the dephasing rate of the system relies on the squeezing phase of the bath, and this phase dependence cannot be precisely derived from the BornMarkovian approximation which is widely adopted in open quantum systems.

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“…In the future, the exploitation of novel sources of work could have a large impact on the design of efficient and powerful engines at the microscale and nanoscale. By employing nonequilibrium reservoirs, it is expected that the efficiency of work generation can surpass standard thermodynamic bounds, as has been theoretically suggested for quantum coherent [12], quantum correlated [13,14], quantum-measurement-induced [15][16][17], and squeezed thermal reservoirs [18][19][20][21][22][23]. The realization of such engines not only extends our knowledge of finite-size, nonequilibrium, and quantum effects in thermodynamics, but could also lead to important applications in nanotechnology and in the life sciences [24].…”

Section: Introductionmentioning

confidence: 98%

“…In our work, we present a physical realization of such an engine with a working medium consisting of a vibrating nanobeam that is driven by squeezed electronic noise to perform work beyond the standard Carnot limit. Furthermore, we demonstrate that by a phase-selective coupling to the squeezed or antisqueezed quadrature, work can be extracted even from a single squeezed reservoir, which is not possible with a standard thermal reservoir [12,21,32].…”

Section: Introductionmentioning

confidence: 99%

Squeezed Environment Boosts Engine Performance

Millen

2017

Physics

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The efficient conversion of thermal energy to mechanical work by a heat engine is an ongoing technological challenge. Since the pioneering work of Carnot, it has been known that the efficiency of heat engines is bounded by a fundamental upper limit-the Carnot limit. Theoretical studies suggest that heat engines may be operated beyond the Carnot limit by exploiting stationary, nonequilibrium reservoirs that are characterized by a temperature as well as further parameters. In a proof-of-principle experiment, we demonstrate that the efficiency of a nanobeam heat engine coupled to squeezed thermal noise is not bounded by the standard Carnot limit. Remarkably, we also show that it is possible to design a cyclic process that allows for extraction of mechanical work from a single squeezed thermal reservoir. Our results demonstrate a qualitatively new regime of nonequilibrium thermodynamics at small scales and provide a new perspective on the design of efficient, highly miniaturized engines.

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Entropy production and thermodynamic power of the squeezed thermal reservoir

Cited by 200 publications

References 64 publications

Coherence-Induced Reversibility and Collective Operation of Quantum Heat Machines via Coherence Recycling

Coherence-Induced Reversibility and Collective Operation of Quantum Heat Machines via Coherence Recycling

Entropy dynamics of a dephasing model in a squeezed thermal bath

Squeezed Environment Boosts Engine Performance

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