Abstract
Abstract
A superconducting quantum interference device (SQUID) comprising 0- and π-Josephson junctions (JJs), called π-SQUID, is studied by the resistively shunted junction model. The π-SQUID shows half-integer Shapiro-steps (SS) under microwave irradiation at the voltage V =
(
ℏ
/
2
e
)
Ω
(
n
/
2
)
, with angular frequency Ω and half-integer n/2 in addition to integer n. We show that the π-SQUID can be a π-qubit with spontaneous loop currents by which the half-integer SS are induced. Making the 0- and π-JJs equivalent is a key for the half-integer SS and realizing the π-qubit.
Funder
Core Research for Evolutional Science and Technology
Tohoku University
Japan Society for the Promotion of Science
Subject
General Physics and Astronomy,General Engineering
Cited by
1 articles.
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