Darlington pair of quantum thermal transistors

Wijesekara, Ravi T.; Gunapala, Sarath D.; Premaratne, Malin

doi:10.1103/physrevb.104.045405

Cited by 22 publications

(7 citation statements)

References 41 publications

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“…Here Tr L,R refers to the trace over each bath degrees of freedom. Under the Born-Markov and rotating wave approximation, the reduced dynamics of the system in the weak sequential tunnelling limit can be written as [21,34,35,52]…”

Section: Appendix A: Derivation Of the Lindblad Master Equationmentioning

confidence: 99%

Universal behaviour of Coulomb coupled Fermionic thermal diode

Ghosh¹,

Gupt²,

Ghosh³

2022

Preprint

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We propose a minimal model of a Coulomb coupled fermionic quantum dot thermal diode that can act as an efficient thermal switch and exhibit complete rectification behaviour, even in presence of a small temperature gradient. Using two well defined dimensionless system parameters, universal characteristics of the optimal heat current condition are identified. It is shown to be independent of any system parameter and is obtained only at the mean transitions point "−0.5", associated with the equilibrium distribution of the two fermionic reservoirs, tacitly referred as "universal magic mean".

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Section: Appendix A: Derivation Of the Lindblad Master Equationmentioning

confidence: 99%

Universal behaviour of Coulomb coupled Fermionic thermal diode

Ghosh¹,

Gupt²,

Ghosh³

2022

Preprint

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“…Quantum thermodynamics provides us with the potential to constructively use quantum features to exploit quantum thermal devices that can manipulate the microscopic energy flow. In recent years, various quantum thermal devices based on versatile systems have been proposed such as quantum engine and refrigerator [26][27][28][29][30], quantum thermometers [31,32], thermal rectifier [33] and switch [34,35], thermal diode [36,37] and transistor [38][39][40][41][42][43][44] and so on. Experimental advances have also made continuously [20,29,[45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in transversely coupled qubits: Optically controlled thermal modulator with common reservoirs

Yang,

Liu,

2022

Preprint

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This paper systematically studied two transversely coupled qubits' heat transfer in contact with independent and common heat reservoirs. We reveal that common heat reservoirs can slightly suppress the steady-state heat currents compared to independent heat reservoirs, and the transverse coupling of qubits can enhance the suppression roles. In particular, in the case of resonant coupling of two qubits and the proper dissipations, the steady state can be decomposed into a stationary dark state which doesn't evolve and contributes zero heat current, and a steady state which corresponds to the maximal heat current. This dark state enables us to control steady-state heat current with an external control field and design a thermal modulator. In addition, we find that inverse heat currents could be present in the dissipative subchannels between the system and reservoirs, which interprets the suppression roles of common heat reservoirs. We also find that heat current for a given system has a similar changing tendency to the concurrence of assistance with temperature.

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“…During the last few years, several possible implementations of this device have been proposed considering tree–qubit systems [ 9 , 10 ], qubit–qutrit system [ 11 ], in circuits of superconducting qubits [ 12 ] and in a system with three-body interaction [ 14 ]. Eventually, also, networks of connected thermal transistors were proposed [ 15 , 16 ]. The main trait of all these implementations is that they propose a three-terminal system to control the thermal energy exchanged by two of its terminals via an incoherent operation offered by the tuning of the temperature of its third terminal.…”

Section: Introductionmentioning

confidence: 99%

Quantum Thermal Amplifiers with Engineered Dissipation

Mandarino

2022

Entropy

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A three-terminal device, able to control the heat currents flowing through it, is known as a quantum thermal transistor whenever it amplifies two output currents as a response to the external source acting on its third terminal. Several efforts have been proposed in the direction of addressing different engineering options of the configuration of the system. Here, we adhere to the scheme in which such a device is implemented as a three-qubit system that interacts with three separate thermal baths. However, another interesting direction is how to engineer the thermal reservoirs to magnify the current amplification. Here, we derive a quantum dynamical equation for the evolution of the system to study the role of distinct dissipative thermal noises. We compare the amplification gain in different configurations and analyze the role of the correlations in a system exhibiting the thermal transistor effect, via measures borrowed from the quantum information theory.

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Darlington pair of quantum thermal transistors

Cited by 22 publications

References 41 publications

Universal behaviour of Coulomb coupled Fermionic thermal diode

Universal behaviour of Coulomb coupled Fermionic thermal diode

Heat transfer in transversely coupled qubits: Optically controlled thermal modulator with common reservoirs

Quantum Thermal Amplifiers with Engineered Dissipation

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