Many-excitation removal of a transmon qubit using a single-junction quantum-circuit refrigerator and a two-tone microwave drive

• URL: http://arxiv.org/abs/2401.14912v2
• Date: Sun, 16 Jun 2024 18:30:43 GMT
• Title: Many-excitation removal of a transmon qubit using a single-junction quantum-circuit refrigerator and a two-tone microwave drive
• Authors: Wallace Teixeira, Timm Mörstedt, Arto Viitanen, Heidi Kivijärvi, András Gunyhó, Maaria Tiiri, Suman Kundu, Aashish Sah, Vasilii Vadimov, Mikko Möttönen,
• Abstract summary: We experimentally demonstrate the utilization of a single-junction quantum-circuit refrigerator (QCR) for the reset of superconducting quantum devices. We observe excitation stabilization times down to roughly $500$ ns, a $20$-fold speedup with QCR and a simultaneous two-tone drive. Results pave the way for optimized reset of quantum-electric devices using engineered environments and for dissipation-engineered state preparation.
• Score: 1.075363883202421
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Achieving fast and precise initialization of qubits is a critical requirement for the successful operation of quantum computers. The combination of engineered environments with all-microwave techniques has recently emerged as a promising approach for the reset of superconducting quantum devices. In this work, we experimentally demonstrate the utilization of a single-junction quantum-circuit refrigerator (QCR) for an expeditious removal of several excitations from a transmon qubit. The QCR is indirectly coupled to the transmon through a resonator in the dispersive regime, constituting a carefully engineered environmental spectrum for the transmon. Using single-shot readout, we observe excitation stabilization times down to roughly $500$ ns, a $20$-fold speedup with QCR and a simultaneous two-tone drive addressing the $e$-$f$ and $f0$-$g1$ transitions of the system. Our results are obtained at a $48$-mK fridge temperature and without postselection, fully capturing the advantage of the protocol for the short-time dynamics and the drive-induced detrimental asymptotic behavior in the presence of relatively hot other baths of the transmon. We validate our results with a detailed Liouvillian model truncated up to the three-excitation subspace, from which we estimate the performance of the protocol in optimized scenarios, such as cold transmon baths and fine-tuned driving frequencies. These results pave the way for optimized reset of quantum-electric devices using engineered environments and for dissipation-engineered state preparation.

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