Speaker: Jukka Pekkola, Aalto University, Finland.

Title: Quantum heat transport in superconducting circuits

Abstract:

In superconducting quantum circuits energy is transferred primarily by emission and absorption of microwave photons. A particular source of such photons is a heat bath that can be realized as an on-chip resistor in a circuit. I will present our recent work on thermodynamics of mesoscopic electronic circuits, combining quantum Josephson junctions, resonators (harmonic oscillators) and heat baths. I introduce superconducting qubits as a working substance for experiments on quantum heat transport, refrigerators and heat engines [1-3], and present our efforts towards measuring quantum trajectories by a calorimetric method [4].

[1] Alberto Ronzani, Bayan Karimi, Jorden Senior, Yu-Cheng Chang, Joonas T. Peltonen, ChiiDong Chen, and Jukka P. Pekola, Tunable photonic heat transport in a quantum heat valve, Nature Physics 14, 991 (2018).

[2] B. Karimi and J. P. Pekola, Otto refrigerator based on a superconducting qubit: classical and quantum performance, Phys. Rev. B 94, 184503 (2016).

[3] Jorden Senior, Azat Gubaydullin, Bayan Karimi, Joonas T. Peltonen, Joachim Ankerhold, and Jukka P. Pekola, Heat rectification via a superconducting artificial atom, arXiv:1908.05574 [4] B. Karimi, F. Brange, P. Samuelsson, and J. P. Pekola, Observing temperature fluctuations of a mesoscopic electron system, arXiv:1904.05041

There will be coffee, tea and bread rolls from 10:00

Klaus Mølmer