Quantum squeezing amplification with a weak Kerr nonlinear oscillator
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Abstract
Quantum squeezed states, with biased quantum noise, have been widely utilized in quantum sensing and quantum error correction applications. However, generating and manipulating these nonclassical states with a large squeezing degree typically requires strong nonlinearity, which inevitably induces additional decoherence that diminishes the overall performance. Here, we demonstrate the generation and amplification of squeezed states in a superconducting microwave cavity with weak Kerr nonlinearity. By subtly engineering an off-resonant microwave drive, we observe cyclic dynamics of the quantum squeezing evolution in a displaced frame of the cavity. Furthermore, we deterministically realize quantum squeezing amplification by alternately displacing the Kerr oscillator using the Trotterization technique, achieving a maximum squeezing degree of 14.6 dB and a squeezing rate of 0.28 MHz. Our demonstrated displacement-enhanced squeezing operation offers a hardware-efficient approach for generating large squeezed states, promising potential applications in quantum-enhanced sensing and quantum information processing. Squeezed states are key resources in quantum technologies, but generating high squeezing usually requires strong nonlinearity. Here, the authors propose and demonstrate a displacement-enhanced squeezing approach that uses weak Kerr nonlinearity and off-resonant driving to generate and amplify squeezing inside a superconducting microwave cavity, reaching 14.6 dB of intracavity squeezing.