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Noise-induced quantum-circuit refrigeration

Autor: Kivijärvi, Heidi, Viitanen, Arto, Mörstedt, Timm, Möttönen, Mikko

We use a transmon qubit and its dispersively coupled readout resonator to measure the Fock state populations of another microwave resonator, to which we have attached a quantum-circuit refrigerator (QCR). First, we apply noise generated at room tempe

Externí odkaz: http://arxiv.org/abs/2412.05886

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Methods to achieve near-millisecond energy relaxation and dephasing times for a superconducting transmon qubit

Autor: Tuokkola, Mikko, Sunada, Yoshiki, Kivijärvi, Heidi, Albanese, Jonatan, Grönberg, Leif, Kaikkonen, Jukka-Pekka, Vesterinen, Visa, Govenius, Joonas, Möttönen, Mikko

Superconducting qubits are one of the most promising physical systems for implementing quantum computers. However, executing quantum algorithms of practical computational advantage requires further improvements in the fidelities of qubit operations,

Externí odkaz: http://arxiv.org/abs/2407.18778

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

Autor: Mörstedt, Timm Fabian, Teixeira, Wallace Santos, Viitanen, Arto, Kivijärvi, Heidi, Tiiri, Maaria, Rasola, Miika, Gunyho, Andras Marton, Kundu, Suman, Lattier, Louis, Vadimov, Vasilii, Catelani, Gianluigi, Sevriuk, Vasilii, Heinsoo, Johannes, Räbinä, Jukka, Ankerhold, Joachim, Möttönen, Mikko

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-excit

Externí odkaz: http://arxiv.org/abs/2402.09594

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

Autor: Teixeira, Wallace, Mörstedt, Timm, Viitanen, Arto, Kivijärvi, Heidi, Gunyhó, András, Tiiri, Maaria, Kundu, Suman, Sah, Aashish, Vadimov, Vasilii, Möttönen, Mikko

Publikováno v: Sci Rep 14, 13755 (2024)

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

Externí odkaz: http://arxiv.org/abs/2401.14912

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Lake Kivi or Kivijärvi:: complex place names of Karelia on maps and in the State Catalog

Autor: Ekaterina Zakharova, Irma Mullonen

Publikováno v: Geodesy and Cartography. 986:56-64

The article raises the problem of recording non-Russian toponyms by origin on topographic maps and in official reference books, which is relevant for cartography, as well as for the regulation of geographical names in general, including the State Cat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2ed42904e7eb623ff5b7c14bf570e11d
https://doi.org/10.22389/0016-7126-2022-986-8-56-64