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Quickly tunable refrigerator for superconducting qubits

Jan Goetz, András Gunyhó, Matti Silveri +3 more

Bulletin of the American Physical SocietyMar 6, 20190 citations

Quickly Tunable Electromagnetic Environment for Superconducting Quantum Circuits

Vasilii Sevriuk, Kuan Yen Tan, Matti Silveri +16 more

Bulletin of the American Physical SocietyMar 6, 20190 citations

Fast Unconditional Initialization for Superconducting Qubit Using Quantum-Circuit Refrigerator

Teruaki Yoshioka

Mar 18, 20240 citations

Flux-Tunable Dissipation for Superconducting Quantum Circuits

Matti Partanen, Kuan Yen Tan, Shumpei Masuda +9 more

Bulletin of the American Physical SocietyMar 7, 20180 citations

Unconditional reset of superconducting qubits and readout resonators using a quantum-circuit refrigerator

Vasilii Sevriuk, Jani Tuorila, Johannes Heinsoo +12 more

Bulletin of the American Physical SocietyMar 2, 20200 citations

Quantum-circuit refrigeration of a superconducting microwave resonator well below a single quantum

Arto Viitanen, Timm Mörstedt, Wallace S. Teixeira +4 more

We experimentally demonstrate a recently proposed single-junction quantum-circuit refrigerator (QCR) as an tunable low-temperature environment for a superconducting 4.7 GHz resonator. With the help of a transmon qubit, we measure the populations of the different resonator Fock states, thus providing reliable access to the temperature of the engineered electromagnetic environment and its effect on the resonator. We demonstrate coherent and thermal resonator states and that the on-demand dissipation provided by the QCR can drive these to a small fraction of a photon on average, even if starting above 1 K. We observe that the QCR can be operated either with a dc bias voltage or a gigahertz rf drive, or a combination of these. The bandwidth of the rf drive is not limited by the circuit itself and consequently, we show that 2.9 GHz continuous and 10 ns pulsed drives lead to identical desired refrigeration of the resonator. These observations answer to the shortcomings of previous works where the Fock states were not resolvable and the QCR exhibited slow charging dynamics. Thus, this work introduces a versatile tool to study open quantum systems, quantum thermodynamics, and to quickly reset superconducting qubits. Published by the American Physical Society 2024We experimentally demonstrate a recently proposed single-junction quantum-circuit refrigerator (QCR) as an tunable low-temperature environment for a superconducting 4.7 GHz resonator. With the help of a transmon qubit, we measure the populations of the different resonator Fock states, thus providing reliable access to the temperature of the engineered electromagnetic environment and its effect on the resonator. We demonstrate coherent and thermal resonator states and that the on-demand dissipation provided by the QCR can drive these to a small fraction of a photon on average, even if starting above 1 K. We observe that the QCR can be operated either with a dc bias voltage or a gigahertz rf drive, or a combination of these. The bandwidth of the rf drive is not limited by the circuit itself and consequently, we show that 2.9 GHz continuous and 10 ns pulsed drives lead to identical desired refrigeration of the resonator. These observations answer to the shortcomings of previous works where the Fock states were not resolvable and the QCR exhibited slow charging dynamics. Thus, this work introduces a versatile tool to study open quantum systems, quantum thermodynamics, and to quickly reset superconducting qubits. Published by the American Physical Society 2024

arXiv:2308.00397Physical Review ResearchJun 10, 20249 citations

Quickly Tunable Refrigerator for Superconducting Quantum Circuits

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