Rapid on-demand generation of thermal states in superconducting quantum circuits
Timm Mörstedt, Wallace S. Teixeira, Arto Viitanen, Heidi Kivijärvi, Maaria Tiiri, Miika Rasola, Andras Marton Gunyho, Suman Kundu, Louis Lattier, Vasilii Vadimov, Gianluigi Catelani, Vasilii Sevriuk, Johannes Heinsoo, Jukka Räbinä, Joachim Ankerhold, Mikko Möttönen
DOI 10.1103/6bty-836h · Physical Review Research
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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