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.
In the Fock basis, |ξ⟩= 1√ coshr ∞X n−0 p (2n)! n!2n (−ξ)n|2n⟩,(7) 3 whereξ=e iθ tanhrandcoshr= (1− |ξ| 2)1/4
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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.