Miguel Montero

Fermionic entanglement ambiguity in noninertial frames

E.M.M. was supported by a CSIC Grant No. JAE-PREDOC2007, the Spanish MICINN Project No. FIS2008-05705/FIS, and the QUITEMAD consortium.

Wavepacket detection with the Unruh-DeWitt model

In this paper we deal with several issues regarding the localization properties of the Unruh-DeWitt (UdW) detector model. Since its original formulation as a pointlike detector, the UdW model has been used to study extensively the physics of quantum fields in presence of accelerations or curved backgrounds. Natural extensions of it have tried to take into account the spatial profile of such detectors, but all of them have met a series of problems in their spectral response which render them useless to study some of the most interesting physical scenarios. In this paper we provide a derivation of the smeared UdW interaction from QED first principles, then we analyze the spectral response of spatially smeared UdW detectors, and discuss the kind of spatial profiles which are useful for the study of relevant cases.

Fermionic entanglement extinction in noninertial frames

E.M.-M. was supported by the CSIC JAE-PREDOC2007 grant scheme. E.M.-M. and J.L. are partially supported by the Spanish MICINN Project No. FIS2008-05705/FIS and the QUITEMAD consortium.

The entangling side of the Unruh-Hawking effect

We show that the Unruh effect can create net quantum entanglement between inertial and accelerated observers depending on the choice of the inertial state. This striking result banishes the extended belief that the Unruh effect can only destroy entanglement and furthermore provides a new and unexpected source for finding experimental evidence of the Unruh and Hawking effects.

Convergence of fermionic-field entanglement at infinite acceleration in relativistic quantum information

E.M.-M. was supported by a CSIC JAE-PREDOC2007 Grant, the Spanish MICINN Project FIS2008-05705/FIS, and the QUITEMAD consortium.

Reply to "Comment on 'Fermionic entanglement ambiguity in noninertial frames' "

In [1] we showed that some previous results on fermionic entanglement in non-inertial frames were not physical due to the arbitrary endowing of a tensor product structure on the fermionic field before computing entanglement measures. We found that this scheme of endowing a tensor product structure to the Fock space may still yield physical results if a particular tensor product structure (different from that of the literature) was chosen.

Fundamental limitations to information transfer in accelerated frames

D.H. was funded in part by a Santander Research Mobility Award. D.H. was funded in part by a University of Sheffield Scholarship

Heterotic NS5-branes from closed string tachyon condensation

We show how to construct the familiar heterotic NS5 brane as a topological soliton in a supercritical version of heterotic string theory. Closed string tachyon condensation removes the extra dimensions, leaving the NS5 in 10d, in a process highly reminiscent of the K-theoretical description of type II D-branes, but linking non-trivial gauge bundles and geometry. The construction requires a modification of the anomalous Bianchi identity for

Nonmonotonic entanglement of physical electromagnetic field states in noninertial frames

H_3

Entanglement of arbitrary spin fields in noninertial frames

in supercritical heterotic string theory. We give various proofs for the existence of this modification.