Scattering with partial information
arXiv:1606.03103
Abstract
We study relativistic scattering when one only has access to a subset of the particles, using the language of quantum measurement theory. We give an exact, non-perturbative formula for the von Neumann entanglement entropy of an apparatus particle scattered off an arbitrary set of system particles, in either the elastic or inelastic regime, and show how to evaluate it perturbatively. We give general formulas for the late-time expectation values of apparatus observables. Some simple example applications are included: in particular, a protocol to verify preparation of coherent superpositions of spatially localized system states using position-space information in the outgoing apparatus state, at lowest order in perturbation theory in a weak apparatus-system coupling.
17 pages
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Cited by in corpus (7)
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- Relativistic effect of entanglement in fermion-fermion scattering
- Variation of entanglement entropy and mutual information in fermion-fermion scattering
- Scattering and momentum space entanglement
- IR dynamics and entanglement entropy
- Soft photon radiation and entanglement
- Entanglement Entropy with a Time-dependent Hamiltonian