Quantum

Alternating Squeezing and Photon Subtraction for Optical Cat-State Generation

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 16/10/2026, 04:13:24 UTC.

Briefings

A 2026 study proposes using alternating squeezing and photon subtraction to generate optical cat states, framing the process as a fidelity-constrained multibranch optimization problem. The research demonstrates that this approach improves fidelity and success probability compared to plain photon subtraction without requiring more squeezing resources, and identifies optimal architectures based on available experimental capabilities.

Key points

• The study formulates cat-state generation as a fidelity-constrained multibranch problem, jointly optimizing the total probability of all photon-number outcomes satisfying a prescribed fidelity threshold.
• Analytical expressions for conditional states, cat-state fidelities, and heralding probabilities are derived to enable efficient multibranch optimization and systematic analysis of resource trade-offs.

Context

Schrödinger cat states are important non-Gaussian resources for quantum information processing and quantum-enhanced metrology. Scaling to large amplitudes while maintaining high fidelity and heralding probability remains a significant challenge in the optical domain.

Limitations

The evidence is preprint status (arXiv:2610.20728v1) and limited to a single snapshot from October 2026. Results are conditional on available squeezing and photon-number-resolving capabilities, with unknowns regarding experimental deviations and specific parameter deviations affecting the analysis.

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