Quantum matter sources an operator-valued Shapiro delay that promotes causal boundaries to noncommuting observables and allows superpositions of causal relations between spacetime points.
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Introduces catability metric rooted in nonlinear squeezing for detecting cat-like features in quantum superpositions, shown numerically robust to loss.
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Quantum Matter Makes Lightcones Quantum
Quantum matter sources an operator-valued Shapiro delay that promotes causal boundaries to noncommuting observables and allows superpositions of causal relations between spacetime points.
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Catability as a metric for evaluating superposed coherent states
Introduces catability metric rooted in nonlinear squeezing for detecting cat-like features in quantum superpositions, shown numerically robust to loss.