Dressed infrared quantum information

Carney, Daniel; Chaurette, Laurent; Neuenfeld, Dominik; Semenoff, Gordon W.

doi:10.1103/physrevd.97.025007

Cited by 45 publications

(70 citation statements)

References 31 publications

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“…Would the decoherence of the momentum configurations of the hard matter particles return in this case? This analysis has recently been carried out in [15]. We will next reanalyze this within the framework introduced in the previous sections of this paper.…”

Section: Jhep02(2018)171mentioning

confidence: 99%

“…Let us employ a notation similar to that of [15]: 23) such that |b; N out = W (β) |b . Then, the reduced density matrix element is…”

Section: Jhep02(2018)171mentioning

confidence: 99%

“…Our approach here, in contrast to [14], is to derive expressions for the density matrices which satisfy conservation of BMS supertranslation charge at all stages. If the measurements are sensitive only to the momenta of the hard matter particles, then the conclusions of [14,15] are unchanged. There is a decoherence of the momentum configurations of these particles.…”

Section: Introductionmentioning

confidence: 99%

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BMS supertranslation symmetry implies Faddeev-Kulish amplitudes

Choi

Akhoury

2018

J. High Energ. Phys.

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We show explicitly that, among the scattering amplitudes constructed from eigenstates of the BMS supertranslation charge, the ones that conserve this charge, are equal to those constructed from Faddeev-Kulish states. Thus, Faddeev-Kulish states naturally arise as a consequence of the asymptotic symmetries of perturbative gravity and all charge conserving amplitudes are infrared finite. In the process we show an important feature of the Faddeev-Kulish clouds dressing the external hard particles: these clouds can be moved from the incoming states to the outgoing ones, and vice-versa, without changing the infrared finiteness properties of S matrix elements. We also apply our discussion to the problem of the decoherence of momentum configurations of hard particles due to soft boson effects.

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Section: Jhep02(2018)171mentioning

confidence: 99%

“…Let us employ a notation similar to that of [15]: 23) such that |b; N out = W (β) |b . Then, the reduced density matrix element is…”

Section: Jhep02(2018)171mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

BMS supertranslation symmetry implies Faddeev-Kulish amplitudes

Choi

Akhoury

2018

J. High Energ. Phys.

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“…Indeed as shown in [10,11,12], tracing over the soft particles in the final state can lead to decoherence, revealing strong entanglement between the hard and soft degrees of freedom. See also [13,14].…”

Section: Introductionmentioning

confidence: 99%

IR dynamics and entanglement entropy

Tomaras

Toumbas

2020

Phys. Rev. D

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We consider scattering of Faddeev-Kulish electrons in QED and study the entanglement between the hard and soft particles in the final state at the perturbative level. The soft photon spectrum naturally splits into two parts: i) soft photons with energies less than a characteristic infrared scale E d present in the clouds accompanying the asymptotic charged particles, and ii) sufficiently low energy photons with energies greater than E d , comprising the soft part of the emitted radiation. We construct the density matrix associated with tracing over the radiative soft photons and calculate the entanglement entropy perturbatively. We find that the entanglement entropy is free of any infrared divergences order by order in perturbation theory. On the other hand infrared divergences in the perturbative expansion for the entanglement entropy appear upon tracing over the entire spectrum of soft photons, including those in the clouds. To leading order the entanglement entropy is set by the square of the Fock basis amplitude for real single soft photon emission, which leads to a logarithmic infrared divergence when integrated over the photon momentum. We argue that the infrared divergences in the entanglement entropy in this latter case persist to all orders in perturbation theory in the infinite volume limit.

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“…The sole exception are processes for which the kinematical factor B α, β defined in [41] is zero. The crucial point is that this happens if and only if the ingoing energy matches the outgoing energy antipodally at each angle, as discussed in detail in [42]. Thus we conclude that 7…”

Section: Relationship To Antipodal Matchingmentioning

confidence: 85%

Black hole evaporation, quantum hair and supertranslations

Gómez

Zell

2018

Eur. Phys. J. C

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In a black hole, hair and quantum information retrieval are interrelated phenomena. The existence of any new form of hair necessarily implies the existence of features in the quantum-mechanically evaporated radiation. Therefore, classical supertranslation hair can be only distinguished from global diffeomorphisms if we have access to the interior of the black hole. Indirect information on the interior can only be obtained from the features of the quantum evaporation. We demonstrate that supertranslations (T − , T + ) ∈ B M S − ⊗ B M S + can be used as bookkeepers of the probability distributions of the emitted quanta where the first element describes the classical injection of energy and the second one is associated to quantum-mechanical emission. However, the connection between T − and T + is determined by the interior quantum dynamics of the black hole. We argue that restricting to the diagonal subgroup is only possible for decoupled modes, which do not bring any non-trivial information about the black hole interior and therefore do not constitute physical hair. It is shown that this is also true for gravitational systems without horizon, for which both injection and emission can be described classically. Moreover, we discuss and clarify the role of infrared physics in purification.

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Dressed infrared quantum information

Cited by 45 publications

References 31 publications

BMS supertranslation symmetry implies Faddeev-Kulish amplitudes

BMS supertranslation symmetry implies Faddeev-Kulish amplitudes

IR dynamics and entanglement entropy

Black hole evaporation, quantum hair and supertranslations

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