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Enhanced qubit readout using locally generated squeezing and inbuilt Purcell-decay suppression

Enhanced qubit readout using locally generated squeezing and inbuilt Purcell-decay suppression

We introduce and analyze a dispersive qubit readout scheme where two-mode squeezing is generated directly in the measurement cavities. The resulting suppression of noise enables fast, high- fidelity readout of naturally weakly coupled qubits, and the possibility to protect strongly coupled qubits from decoherence by weakening their coupling. Unlike other …