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We introduce and analyze a dispersive qubit readout scheme where two-modesqueezing is generated directly in the measurement cavities. The resultingsuppression of noise enables fast, high- fidelity readout of naturally weaklycoupled qubits, and the possibility to protect strongly coupled qubits fromdecoherence by weakening their coupling. Unlike other approaches exploitingsqueezing, our setup avoids the difficult task of transporting and injectingwith high fidelity an externally-generated squeezed state. Our setup is alsosurprisingly robust against unwanted non-QND backaction effects, asinterference naturally suppresses Purcell decay: the system acts as its ownPurcell filter. Our setup is compatible with the experimental state-of-the-artin circuit QED systems, but the basic idea could also be realized in othersystems.

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