Rapid on-demand generation of thermal states in superconducting quantum circuits

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2025-10

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Department of Applied Physics

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en

Pages

7

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Physical Review Research, Volume 7, issue 4, pp. 1-7

Abstract

We experimentally demonstrate the fast generation of thermal states of a transmon using a single-junction quantum-circuit refrigerator (QCR) as an in situ tunable environment. Through single-shot readout, we monitor the transmon up to its third excited state, assessing population distributions controlled by QCR drive pulses. Whereas cooling can be achieved in the weak-drive regime, high-amplitude pulses can generate Boltzmann-distributed populations from a temperature of 110 mK up to 500 mK within 100 ns. As we propose in our work, this fast and efficient temperature control provides an appealing opportunity to demonstrate a quantum heat engine. Our results also pave the way for efficient dissipative state preparation and for reducing the circuit depth in thermally assisted quantum algorithms and quantum annealing.

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| openaire: EC/H2020/101053801/EU//ConceptQ

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DOI

10.1103/6bty-836h

Citation

Mörstedt, T, Teixeira, W S, Viitanen, A, Kivijärvi, H, Tiiri, M, Rasola, M, Gunyho, A M, Kundu, S, Lattier, L, Vadimov, V, Catelani, G, Sevriuk, V, Heinsoo, J, Räbinä, J, Ankerhold, J & Möttönen, M 2025, 'Rapid on-demand generation of thermal states in superconducting quantum circuits', Physical Review Research, vol. 7, no. 4, L042010, pp. 1-7. https://doi.org/10.1103/6bty-836h

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https://urn.fi/URN:NBN:fi:aalto-202512299605

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[article-cris] Perustieteiden korkeakoulu / SCI