Formulates unresolved soft photons in QED as an open quantum system environment, derives IR-finite probabilities via influence functional and equal-history identity, and obtains explicit leading-soft Lindblad evolution on the hard sector.
Infrared quantum information
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abstract
We discuss information-theoretic properties of low-energy photons and gravitons in the S-matrix. Given an incoming n-particle momentum eigenstate, we demonstrate that unobserved soft photons decohere nearly all outgoing momentum superpositions of charged particles, while the universality of gravity implies that soft gravitons decohere nearly all outgoing momentum superpositions of all the hard particles. Using this decoherence, we compute the entanglement entropy of the soft bosons and show that it is infrared-finite when the leading divergences are re-summed a la Bloch and Nordsieck.
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Calculates decoherence from radiation on a Bell-state fermion pair by mapping integrated Altarelli-Parisi splitting functions to Kraus operators of an open quantum system.
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A universal forward-scattering description in long-range theories makes partial-wave amplitudes well-defined single-scale objects computable order-by-order without spurious IR dependence.
citing papers explorer
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Soft QED as Open Quantum System: Infrared Cancellation and Soft-Shell Coarse Graining
Formulates unresolved soft photons in QED as an open quantum system environment, derives IR-finite probabilities via influence functional and equal-history identity, and obtains explicit leading-soft Lindblad evolution on the hard sector.
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Decoherence effects in entangled fermion pairs at colliders
Calculates decoherence from radiation on a Bell-state fermion pair by mapping integrated Altarelli-Parisi splitting functions to Kraus operators of an open quantum system.
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Particle detector in a position-superposed black hole spacetime
An Unruh-DeWitt detector interacting with a position-superposed BTZ black hole produces outcome probabilities containing a nonclassical contribution that distinguishes quantum superposition from classical mixtures, arising from singularities in the probed spectrum.
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Partial-wave unitarity and long-range interactions
A universal forward-scattering description in long-range theories makes partial-wave amplitudes well-defined single-scale objects computable order-by-order without spurious IR dependence.