Quantum Finite-Time Thermodynamics: Insight from a Single Qubit Engine

Dann, Roie; Kosloff, Ronnie; Salamon, Peter

doi:10.3390/e22111255

Cited by 41 publications

(25 citation statements)

References 159 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, we observe that the invariant state's population in the energy basis is nothing but the properly normalized eigenvector with eigenvalue 1 of the reducible transition matrix T cyc (l A , m A ) [11,28,29]. Comparing Eqs.…”

Section: Fig 1 (Color Online)mentioning

confidence: 95%

Two-stroke Quantum Measurement Heat Engine

Alam¹,

Venkatesh²

2022

Preprint

View full text Add to dashboard Cite

We propose and analyze the theoretical model for a two-stroke quantum heat engine with one of the heat baths replaced by a non-selective quantum measurement. We show that the engine's invariant reference state depends on whether the cycle is monitored or unmonitored via diagnostic measurements to determine the engine's work output. We explore in detail the average work output and fluctuations of the proposed heat engine for the monitored and unmonitored cases. We also identify unitary work strokes for which the invariant states can support coherences in the energy basis leading to differing predictions for the average energy change during the unitary work strokes and the average work from the standard two-projective measurement approach.

show abstract

Section: Fig 1 (Color Online)mentioning

confidence: 95%

Two-stroke Quantum Measurement Heat Engine

Alam¹,

Venkatesh²

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In the past years, FTT theory has been widely used to study all kinds of QHEs, including Carnot [ 68 , 69 , 70 ], Otto [ 71 , 72 , 73 ], Stirling [ 74 ], and Brayton [ 75 ] QHEs, from the reversible cycle, endoreversible cycle to the irreversible cycle. Different optimization objective functions, from power, efficiency to ecological function, and thermo-economic performance in single-stage quantum thermodynamic cycles, have been studied widely [ 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Optimization for Irreversible Combined Carnot Heat Engine Working with Ideal Quantum Gases

Chen

Meng

et al. 2021

Entropy

View full text Add to dashboard Cite

An irreversible combined Carnot cycle model using ideal quantum gases as a working medium was studied by using finite-time thermodynamics. The combined cycle consisted of two Carnot sub-cycles in a cascade mode. Considering thermal resistance, internal irreversibility, and heat leakage losses, the power output and thermal efficiency of the irreversible combined Carnot cycle were derived by utilizing the quantum gas state equation. The temperature effect of the working medium on power output and thermal efficiency is analyzed by numerical method, the optimal relationship between power output and thermal efficiency is solved by the Euler-Lagrange equation, and the effects of different working mediums on the optimal power and thermal efficiency performance are also focused. The results show that there is a set of working medium temperatures that makes the power output of the combined cycle be maximum. When there is no heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are parabolic-like ones, and the internal irreversibility makes both power output and efficiency decrease. When there is heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are loop-shaped ones, and the heat leakage loss only affects the thermal efficiency of the combined Carnot cycle. Comparing the power output of combined heat engines with four types of working mediums, the two-stage combined Carnot cycle using ideal Fermi-Bose gas as working medium obtains the highest power output.

show abstract

“…Finite-time thermodynamics (FTT) has made significant progress in physics and engineering fields since the mid-1970 s [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ], and the aim is to reduce the irreversibility of systems under finite time and size constraints. The applications of FTT include the researches of optimal performances [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ] and optimal configurations [ 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 ] for various thermodynamic processes, devices and cycles.…”

Section: Introductionmentioning

confidence: 99%

Minimization of Entropy Generation Rate in Hydrogen Iodide Decomposition Reactor Heated by High-Temperature Helium

Kong

Chen

Xia

et al. 2021

Entropy

View full text Add to dashboard Cite

The thermochemical sulfur-iodine cycle is a potential method for hydrogen production, and the hydrogen iodide (HI) decomposition is the key step to determine the efficiency of hydrogen production in the cycle. To further reduce the irreversibility of various transmission processes in the HI decomposition reaction, a one-dimensional plug flow model of HI decomposition tubular reactor is established, and performance optimization with entropy generate rate minimization (EGRM) in the decomposition reaction system as an optimization goal based on finite-time thermodynamics is carried out. The reference reactor is heated counter-currently by high-temperature helium gas, the optimal reactor and the modified reactor are designed based on the reference reactor design parameters. With the EGRM as the optimization goal, the optimal control method is used to solve the optimal configuration of the reactor under the condition that both the reactant inlet state and hydrogen production rate are fixed, and the optimal value of total EGR in the reactor is reduced by 13.3% compared with the reference value. The reference reactor is improved on the basis of the total EGR in the optimal reactor, two modified reactors with increased length are designed under the condition of changing the helium inlet state. The total EGR of the two modified reactors are the same as that of the optimal reactor, which are realized by decreasing the helium inlet temperature and helium inlet flow rate, respectively. The results show that the EGR of heat transfer accounts for a large proportion, and the decrease of total EGR is mainly caused by reducing heat transfer irreversibility. The local total EGR of the optimal reactor distribution is more uniform, which approximately confirms the principle of equipartition of entropy production. The EGR distributions of the modified reactors are similar to that of the reference reactor, but the reactor length increases significantly, bringing a relatively large pressure drop. The research results have certain guiding significance to the optimum design of HI decomposition reactors.

show abstract

Quantum Finite-Time Thermodynamics: Insight from a Single Qubit Engine

Cited by 41 publications

References 159 publications

Two-stroke Quantum Measurement Heat Engine

Two-stroke Quantum Measurement Heat Engine

Performance Analysis and Optimization for Irreversible Combined Carnot Heat Engine Working with Ideal Quantum Gases

Minimization of Entropy Generation Rate in Hydrogen Iodide Decomposition Reactor Heated by High-Temperature Helium

Contact Info

Product

Resources

About