Simultaneous transient dispersive readout of multiple spin qubits
Florian Ginzel, Guido Burkard · Physical review. B./Physical review. B · 2023
We propose a paradigm of multiplexed dispersive qubit measurement performed while the qubits dephase. A Laplace transformation of the time-dependent cavity response allows to separate contributions from multiple qubits coupled to the same resonator mode, thus allowing for simultaneous single-shot readout. With realistic parameters for silicon spin qubits we find a competitive readout fidelity, while the measurement time compares favorably to conventional dispersive readout. We extend the multiplexed readout method to quantum nondemolition measurements using auxiliary qubits.