Time dynamics of interference features in the presence of intrinsic losses in the hardware. This makes the resulting state significantly less susceptible to the filter and effectively preserves its quantum interference features against photon loss. Under the action of the compression operation, the interference blobs are pushed closer to the origin. (b) Preservation of the quantum non-Gaussianity can be achieved by compressing the phase space of the cat states, symbolized by the arrow with the compression coefficient ξ. The quantum interference features, represented by the amplitude of the blobs (black arrows), diminish substantially over time as they are composed of higher-frequency components, which are more susceptible to the low-pass filter imposed by photon loss. (a) Cat states created in superconducting cavities suffer predominantly from photon loss, which acts as a symmetric low-pass Gaussian filter (green) with width determined by ∼ 1 / κ t in the characteristic function representation, where κ is the rate of photon loss. Protection of quantum interference against photon loss. Our technique also offers a versatile tool for enhancing the noise resilience of CV quantum states and opens new possibilities for quantum metrology and fault-tolerant quantum computing with bosonic codes. Our results bring invaluable insights into investigating intrinsic dynamics of quantum interference in CV quantum states. Our experiment shows that the quantum interference of compressed cat states is significantly more robust against photon loss compared to normal cat states. To evade this loss, we compress the cat state using a deterministic gate-based protocol to lower the frequencies of these interference features. These elements also encode valuable quantum interference information. The dominant error channel is photon loss, which corresponds to a loss of high-frequency elements in the characteristic function, a convenient spectral representation of quantum states. We realize bosonic cat states in a superconducting cavity, which is designed to be a nearly ideal quantum harmonic oscillator. Here, we experimentally demonstrate the protection of these quantum interference features in cat states by manipulating their phase-space distribution. However, the unique characteristics of cat states are highly fragile, as they arise from inherently quantum mechanical interference effects that can be easily destroyed by decoherence. Schrödinger’s cat states-superpositions of macroscopically distinct states-are great candidates for exploring the fundamental ideas of quantum decoherence and for developing continuous-variable (CV) quantum sensing and quantum computing. Such compressed cat states offer an attractive avenue for obtaining new insights into quantum foundations and quantum metrology, as well as for developing inherently more protected bosonic code words for quantum error correction. We present a versatile technique for creating robust non-Gaussian continuous-variable resource states in a highly linear bosonic mode and manipulating their phase-space distribution to achieve enhanced resilience against photon loss. We achieve this compression with a deterministic technique based on the echoed conditional displacement operation in a circuit QED device. Here, we protect these non-Gaussian features against photon loss by compressing the phase-space distribution of a cat state. However, they are highly susceptible to photon loss, which inevitably diminishes their quantum non-Gaussian features. Cat states, with their unique phase-space interference properties, are ideal candidates for understanding fundamental principles of quantum mechanics and performing key quantum information processing tasks.
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