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28 March 2024 |
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Article overview
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Breaking the trade-off between fast control and long lifetime of a superconducting qubit | Shingo Kono
; Kazuki Koshino
; Dany Lachance-Quirion
; Arjan F. Van Loo
; Yutaka Tabuchi
; Atsushi Noguchi
; Yasunobu Nakamura
; | Date: |
5 Feb 2020 | Abstract: | The rapid development in designs and fabrication techniques of
superconducting qubits has helped making coherence times of qubits longer. In
the near future, however, the radiative decay of a qubit into its control line
will be a fundamental limitation, imposing a trade-off between fast control and
long lifetime of the qubit. In this work, we successfully break this trade-off
by strongly coupling another superconducting qubit along the control line. This
second qubit, which we call a Josephson quantum filter~(JQF), prevents the
qubit from emitting microwave photons and thus suppresses its relaxation, while
faithfully transmitting large-amplitude control microwave pulses due to the
saturation of the quantum filter, enabling fast qubit control. We observe an
improvement of the qubit relaxation time without a reduction of the Rabi
frequency. This device could potentially help in the realization of a
large-scale superconducting quantum information processor in terms of the
heating of the qubit environments and the crosstalk between qubits. | Source: | arXiv, 2002.1635 | Services: | Forum | Review | PDF | Favorites |
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