Half-integer Shapiro-steps in superconducting qubit with a $\pi$-Josephson junction
| Autor: | Sadamichi Maekawa, Michiyasu Mori |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Superconductivity Angular frequency Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Superconductivity General Engineering General Physics and Astronomy Omega law.invention Pi Josephson junction SQUID Loop (topology) law Qubit Condensed Matter::Superconductivity Half-integer |
| Popis: | A superconducting quantum interference device (SQUID) comprising 0- and $\pi$-Josephson junctions (JJs), called $\pi$-SQUID, is studied by the resistively shunted junction model. The $\pi$-SQUID shows half-integer Shapiro-steps (SS) under microwave irradiation at the voltage $V$ = $(\hbar/2e)\Omega (n/2)$, with angular frequency $\Omega$ and half-integer $n$/2 in addition to integer $n$. We show that the $\pi$-SQUID can be a $\pi$-qubit with spontaneous loop currents by which the half-integer SS are induced. Making the 0- and $\pi$-JJs equivalent is a key for the half-integer SS and realizing the $\pi$-qubit. Comment: 4 pages, 6figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|