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

• DOI: 10.48550/arxiv.2402.09594
• Publication Date: 2024-02-14
• Authors: Timm Mörstedt; Wallace S. Teixeira; A.J. Viitanen; Heidi Kivijärvi; Maaria Tiiri; Miika Rasola; András Gunyhó; S. Kundu; Louis Lattier; Vasilii Vadimov; Gianluigi Catelani; Vasilii Sevriuk; Johannes Heinsoo; Jukka Räbinä; Joachim Ankerhold; Mikko Möttönen

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