This circuit uses a P-FET – to turn the power on, open the FET by bringing the GATE ... say “transistor”, they usually mean BJT, and when people say “FET”, they usually mean “MOSFET”.
More information: Chenxi Wang et al, Experimental Realization of Direct Entangling Gates between Dual-Type Qubits, Physical Review Letters (2025). DOI: 10.1103/PhysRevLett.134.010601 . On arXiv ...
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