Higher-order quantum processes respecting closed labs in classical spacetime are exactly those realizable as quantum circuits with quantum control of causal order.
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Using two large reference spins in rotational group averaging recovers the standard quantum spin state description in the large limit.
Diffeomorphism invariance qualifies as a gauge symmetry solely in the global sense, restricting the applicability of observables and rendering correlation-based accounts of physical content unfounded.
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Higher-order quantum processes respecting closed labs in a spacetime have quantum controlled causal order
Higher-order quantum processes respecting closed labs in classical spacetime are exactly those realizable as quantum circuits with quantum control of causal order.
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Complete Relational Description of Spin in a Quantum Background
Using two large reference spins in rotational group averaging recovers the standard quantum spin state description in the large limit.
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The Limitations of the Notion of `Observable' in Diffeomorphism-Invariant Models
Diffeomorphism invariance qualifies as a gauge symmetry solely in the global sense, restricting the applicability of observables and rendering correlation-based accounts of physical content unfounded.