**Effect of gravity on localized two-mode Gaussian quantum states** - Mehdi Ahmadi

We study how an arbitrary Gaussian state of two localized wave
packets, prepared in an inertial frame of reference, is described by a
pair of uniformly accelerated observers. We explicitly compute the
resulting state for arbitrarily chosen proper accelerations of the
observers and independently tuned distance between them. To do so, we
introduce a generalized Rindler frame of reference and analytically
derive the corresponding state transformation as a Gaussian channel. Our
approach provides several new insights into the phenomenon of vacuum
entanglement such as the highly nontrivial effect of spatial separation
between the observers including sudden death of entanglement. We also
calculate the fidelity of the two-mode channel for non-vacuum Gaussian
states and obtain bounds on classical and quantum capacities of a
single-mode channel. Our framework can be directly applied to any
continuous variable quantum information protocol in which the effects of
acceleration or gravity cannot be neglected.