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Explore quantum metrology techniques that surpass classical measurement limits using a single bosonic mode in circuit quantum electrodynamics (cQED) platforms. Learn about a versatile and deterministic protocol for quantum-enhanced parameter estimation that relies on two efficient state-transfer operations, avoiding the need for large squeezed states or complex multiparticle entangled states that are typically experimentally demanding and susceptible to decoherence. Discover how this approach demonstrates phase and amplitude estimation using superpositions of coherent states in bosonic cQED systems, achieving Heisenberg-like scaling with metrological gains of 7.5(6) dB for phase estimation and 9.3(5) dB for amplitude estimation. Understand how the gain and sensitivity range can be dynamically optimized by tailoring the superposition weights of the input state, providing a practical and flexible route to quantum-enhanced sensing applicable not only to bosonic cQED devices but also to a broad class of continuous-variable quantum platforms.
