Amplification of realistic cat-like states by homodyne heralding

Abstract

We present a scheme for the amplification of Schrodinger cats that collapses two smaller states onto their constructive interference via a homodyne projection. We analyze the performance of the amplification in terms of fidelity and success rate when the input consists of either exact coherent state superpositions or of photon-subtracted squeezed vacua. The impact of imprecise homodyne detection and of impure squeezing is quantified. We also assess the scalability of iterated amplifications.

11 pages, 15 figures

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• Photon-by-photon quantum light state engineering
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• Experimental preparation and manipulation of squeezed cat states via an all-optical in-line squeezer
• Asymptotic state transformations of continuous variable resources
• Assessments of macroscopicity for quantum optical states
• Exact solution and coherent states of an asymmetric oscillator with position-dependent mass
• Iterative tailoring of optical quantum states with homodyne measurements
• Boosting the generation rate of squeezed single-photon states by generalized photon subtraction
• Method to deterministically generate large-amplitude optical cat states
• Simultaneous preparation of two optical cat states based on a nondegenerate optical parametric amplifier
• Homodyne measurement with a Schrödinger cat state as a local oscillator
• Amplification of optical Schrödinger cat states with implementation protocol based on frequency comb
• Time-domain programmable beam-splitter operations for an optical phase-sensitive non-Gaussian state
• Efficient optical cat state generation using squeezed few-photon superposition states
• Loss-tolerant concatenated Bell-state measurement with encoded coherent-state qubits for long-range quantum communication
• Parity-Swap State Comparison Amplifier for Schrödinger Cat States