The heralded OPA protocol generates cubic phase states with fidelity exceeding 0.99 from coherent states and amplifies cat states from amplitude ≤1 to ≥2 with fidelity >0.99 while offering self-seeding for larger states.
Multiphoton heralding generates large-amplitude squeezed Schr\"odinger cat states and parity-selective Fock superpositions from squeezed vacuum via an OPA
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abstract
We propose a multiphoton heralding scheme using an optical parametric amplifier (OPA) that converts squeezed vacuum into two families of non-Gaussian states: large-amplitude squeezed Schr\"odinger cat states and low-order parity-selective Fock superpositions. By injecting m photons into the idler port and detecting n photons at the output, effective high-order photon subtraction is realized in a single OPA device. The heralded states exhibit strong Wigner negativity and high phase-space complexity. Remarkably, under photon loss, the complexity remains substantial even after negativity vanishes, indicating a loss-resilient quantum resource. These states also surpass the Heisenberg limit in phase estimation. Our protocol establishes the OPA as a versatile platform for generating non-Gaussian states, with promising applications in loss-resilient quantum metrology and fault-tolerant quantum information processing.
fields
quant-ph 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
A multiphoton heralding protocol in an OPA produces large-amplitude squeezed cat states and parity-selective Fock superpositions from squeezed vacuum, with claimed Wigner negativity, phase-space complexity, and loss resilience.
citing papers explorer
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Programmable optical parametric amplifier synthesizer for cubic phase states and amplified Schrodinger cat states
The heralded OPA protocol generates cubic phase states with fidelity exceeding 0.99 from coherent states and amplifies cat states from amplitude ≤1 to ≥2 with fidelity >0.99 while offering self-seeding for larger states.
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Multiphoton heralding generates large-amplitude squeezed Schr\"odinger cat states and parity-selective Fock superpositions from squeezed vacuum via an OPA
A multiphoton heralding protocol in an OPA produces large-amplitude squeezed cat states and parity-selective Fock superpositions from squeezed vacuum, with claimed Wigner negativity, phase-space complexity, and loss resilience.