Coherent Caloritronics in Josephson-Based Nanocircuits

Pérez, M.J.; Solinas, Paolo; Giazotto, Francesco

doi:10.1007/s10909-014-1132-6

Cited by 67 publications

(92 citation statements)

References 39 publications

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“…The thermodynamic implications of quantum dynamics are currently helping us build new architectures for the superefficient nano-and micro-engines, and design protocols for the manipulation and management of work and heat above and beyond the possibilities offered by classical processes, [1][2][3][4] including steps towards the formulation of a coherent framework for caloritronics [5][6][7] and the demonstration of Maxwell's daemon with elementary working media. 8,9 Exciting experimental progress towards the achievement of such paramount goals is currently ongoing.…”

Section: Introductionmentioning

confidence: 99%

Daemonic ergotropy: enhanced work extraction from quantum correlations

et al. 2017

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We investigate how the presence of quantum correlations can influence work extraction in closed quantum systems, establishing a new link between the field of quantum non-equilibrium thermodynamics and the one of quantum information theory. We consider a bipartite quantum system and we show that it is possible to optimize the process of work extraction, thanks to the correlations between the two parts of the system, by using an appropriate feedback protocol based on the concept of ergotropy. We prove that the maximum gain in the extracted work is related to the existence of quantum correlations between the two parts, quantified by either quantum discord or, for pure states, entanglement. We then illustrate our general findings on a simple physical situation consisting of a qubit system.

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Section: Introductionmentioning

confidence: 99%

Daemonic ergotropy: enhanced work extraction from quantum correlations

et al. 2017

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“…(2), which is valid in the limit of a short N-wire. In the case of an arbitrary length we have solved numerically the Usadel equation (1) in the N region 28,29 to obtain the DoS in the middle of the wire and compute the thermal conductance κ from Eq. (3).…”

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confidence: 99%

Proximity nanovalve with large phase-tunable thermal conductance

Strambini

Bergeret

Giazotto

2014

Applied Physics Letters

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We propose a phase-controlled heat-flux quantum valve based on the proximity effect driven by a superconducting quantum interference proximity transistor (SQUIPT). Its operation relies on the phase-dependent quasiparticle density of states in the Josephson weak-link of the SQUIPT which controls thermal transport across the device. In a realistic Al/Cu-based setup the structure can provide efficient control of thermal current inducing temperature swings exceeding ∼ 100 mK, and flux-to-temperature transfer coefficients up to ∼ 500 mK/Φ 0 below 100 mK. The nanovalve performances improve by lowering the bath temperature, making the proposed structure a promising building-block for the implementation of coherent caloritronic devices operating below 1 K.Phase-dependent manipulation of heat in solid-state nanodevices is nowadays one of the major challenges of coherent caloritronics 1 , and plays a key role in determining the physical properties of mesoscopic systems at low temperature. Toward this direction, the prototype for a heat interferometer has been recently realized with a superconducting quantum interference device (SQUID) where the modulation of the thermal current has been achieved thanks to the Josephson coupling 2-5 . Yet, phase-dependent thermal transport has been also demonstrated in Andreev interferometers 6-8 where the proximity effect in a normal metal affects its thermal conductance, and is controlled via a magnetic field.Here we propose an alternative approach to control heat transport by envisioning a thermal nanovalve based on proximity effect but phase-controlled by a SQUIPT 9-12 . Differing from SQUID-based and Andreev interferometers our device allows a drastic quenching of the thermal conductance which makes our proposal an efficient phase-tunable thermal nanovalve. Specifically, we expect an improvement of the temperature swing (up to ∼ 100 mK) and a flux-to-temperature transfer function exceeding 500 mK/Φ 0 at 100 mK.A sketch for the proximity nanovalve is shown in Fig. 1(a) and consists of a SQUIPT composed by a superconducting (S) ring interrupted by a diffusive normal metal (N) wire of length L. We assume the wire transverse dimensions to be negligible in comparison to its length so that it can be considered as quasi-onedimensional. Superconducting correlations are induced in the N wire owing to proximity effect from the S loop a) Electronic

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“…Recently, the features of the phase-coherent thermal transport in Josephson devices have been investigated and confirmed experimentally in several interferometer-like structures [2][3][4][5][6][7][8][9]. In Ref.…”

Section: Introductionmentioning

confidence: 98%

Hysteretic Superconducting Heat-Flux Quantum Modulator

et al. 2017

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We discuss heat transport in a thermally-biased SQUID in the presence of an external magnetic flux, when a non-negligible inductance of the SQUID ring is taken into account. A properly sweeping driving flux causes the thermal current to modulate and behave hysteretically. The response of this device is analysed as a function of both the hysteresis parameter and degree of asymmetry of the SQUID, highlighting the parameter range over which hysteretic behavior is observable. Markedly, also the temperature of the SQUID shows hysteretic evolution, with sharp transitions characterized by temperature jumps up to, e.g., ∼ 0.02 K for a realistic Al-based setup. In view of these results, the proposed device can effectively find application as a temperature-based superconducting memory element, working even at GHz frequencies by suitably choosing the superconductor on which the device is based.

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Coherent Caloritronics in Josephson-Based Nanocircuits

Cited by 67 publications

References 39 publications

Daemonic ergotropy: enhanced work extraction from quantum correlations

Daemonic ergotropy: enhanced work extraction from quantum correlations

Proximity nanovalve with large phase-tunable thermal conductance

Hysteretic Superconducting Heat-Flux Quantum Modulator

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