Heat rectification via a superconducting artificial atom

Senior, Jorden; Gubaydullin, A. R.; Karimi, Bayan; Peltonen, Joonas T.; Ankerhold, Joachim; Pekola, Jukka P.

doi:10.48550/arxiv.1908.05574

Cited by 3 publications

(8 citation statements)

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“…resembling the result (35) derived for the case of Ohmic dissipation. The intraband contribution (71) in this temperature interval takes the form The heat flux ( 74) is a contribution of thermally activated phase slips, i.e.…”

Section: Effects Of Anharmonicity In the Weak-coupling Limitsupporting

confidence: 81%

“…However, in this case the transmission probability τ (ω) becomes dependent on the bath temperatures T 1,2 . Such dependence, for example, makes the rectification of heat possible in a nonlinear and nonsymmetric system, as has been demonstrated in a recent experiment with Josephson junctions 35 .…”

Section: Introductionmentioning

confidence: 84%

“…This simple approximation correctly captures the leading term of the high temperature asymptotics (35), but fails to reproduce the sub-leading term as well as the low temperature power law dependence of the heat flux (34). Interestingly, the δ-peak approximation (36) for the transmission probability holds even for an overdamped junction with ω J γ k B T 1,2 and for a system with I C = 0 provided γ k B T 1,2 .…”

Section: Linearized Dynamicsmentioning

confidence: 98%

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Photonic heat transport across a Josephson junction

2019

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We present a detailed study of photonic heat transport across a Josephson junction coupled to two arbitrary linear circuits having different temperatures. First, we consider the linear approximation, in which a nonlinear Josephson potential is replaced by a quadratic one and the junction acts as an inductor. Afterwards, we discuss the effects of junction anharmonicity. We separately consider the weak-coupling limit, in which the Bloch band structure of the junction energy spectrum plays an important role, and the opposite strong-coupling regime. We apply our general results to two specific models: a Josephson junction coupled to two Ohmic resistors and two resonators. We derive simple analytical approximations for the photonic heat flux in many limiting cases. We demonstrate that electric circuits with embedded Josephson junctions provide a useful platform for quantum thermodynamics experiments. 2 4e 4 E 2 J ω 6 , ω ω J ,

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Section: Effects Of Anharmonicity In the Weak-coupling Limitsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 84%

Section: Linearized Dynamicsmentioning

confidence: 98%

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Photonic heat transport across a Josephson junction

2019

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“…Thermalization of these modes to the lowest achievable temperature is essential to limit unwanted decoherence of the quantum bits (qubits). At the same time, superconducting circuits are considered as a viable platform for thermodynamics experiments in the quantum regime [2][3][4][5][6][7][8]. From that perspective, microwave waveguides, hosting a continuum of modes with an Ohmic spectral density, are natural candidates for realizing heat baths.…”

Section: Introductionmentioning

confidence: 99%

“…In the context of thermodynamics, quantum-limited radiative heating and cooling mediated by microwave photons have been demonstrated [18,[22][23][24]. In a series of recent experiments [4,6,25], the thermal photon occupation of microwave resonators was controlled and measured with the help of embedded mesoscopic metallic resistors acting as heat reservoirs for the confined microwave modes. Finally, efficient detectors of single propagating microwave photons have been recently demonstrated [26][27][28][29][30], albeit with a limited bandwidth and non-continuous operation.…”

Section: Introductionmentioning

confidence: 99%

Primary thermometry of propagating microwaves in the quantum regime

Scigliuzzo,

Bengtsson,

Besse

et al. 2020

Preprint

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The ability to control and measure the temperature of propagating microwave modes down to very low temperatures is indispensable for quantum information processing, and may open opportunities for studies of heat transport at the nanoscale, also in the quantum regime. Here we propose and experimentally demonstrate primary thermometry of propagating microwaves using a transmontype superconducting circuit. Our device operates continuously, with a sensitivity down to 4 × 10 −4 photons/ √ Hz and a bandwidth of 40 MHz. We measure the thermal occupation of the modes of a highly attenuated coaxial cable in a range of 0.001 to 0.4 thermal photons, corresponding to a temperature range from 35 mK to 210 mK at a frequency around 5 GHz. To increase the radiation temperature in a controlled fashion, we either inject calibrated, wideband digital noise, or heat the device and its environment. This thermometry scheme can find applications in benchmarking and characterization of cryogenic microwave setups, temperature measurements in hybrid quantum systems, and quantum thermodynamics.

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Large Deviations and Fluctuation Theorem for the Quantum Heat Current

Aurell,

Donvil,

Mallick

2019

Preprint

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We study the heat current flowing between two baths consisting of harmonic oscillators interacting with a qubit through a spin-boson coupling. An explicit expression for the generating function of the total heat flowing between the hot and cold baths is derived by evaluating the corresponding Feynman-Vernon path integral under the non-interacting blip approximation (NIBA). This generating function satisfies the Gallavotti-Cohen fluctuation theorem, both before and after performing the NIBA. We also verify that the heat conductivity is proportional to the variance of the heat current, retrieving the well known fluctuation dissipation relation. Finally, we present numerical results for the heat current.

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Heat rectification via a superconducting artificial atom

Cited by 3 publications

References 0 publications

Photonic heat transport across a Josephson junction

Photonic heat transport across a Josephson junction

Primary thermometry of propagating microwaves in the quantum regime

Large Deviations and Fluctuation Theorem for the Quantum Heat Current

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