Uncertainty relation in Schwarzschild spacetime

TL;DR

This paper investigates how Hawking radiation affects the entropic uncertainty relation near a Schwarzschild black hole, revealing modifications that could be experimentally observed and implications for black hole information paradox.

Contribution

It introduces a novel analysis of entropic uncertainty in curved spacetime, linking Hawking radiation effects to quantum uncertainty bounds and information transfer.

Findings

Hawking radiation increases measurement uncertainty for static observers.

Quantum information can be transferred via quantum fields outside the black hole.

Certain initial states allow entanglement and uncertainty bounds to be maintained despite Hawking decoherence.

Abstract

We explore the entropic uncertainty relation in the curved background outside a Schwarzschild black hole, and find that Hawking radiation introduces a nontrivial modification on the uncertainty bound for particular observer, therefore it could be witnessed by proper uncertainty game experimentally. We first investigate an uncertainty game between a free falling observer and his static partner holding a quantum memory initially entangled with the quantum system to be measured. Due to the information loss from Hawking decoherence, we find an inevitable increase of the uncertainty on the outcome of measurements in the view of static observer, which is dependent on the mass of the black hole, the distance of observer from event horizon, and the mode frequency of quantum memory. To illustrate the generality of this paradigm, we relate the entropic uncertainty bound with other uncertainty probe, e.g., time-energy uncertainty. In an alternative game between two static players, we show that quantum information of qubit can be transferred to quantum memory through a bath of fluctuating quantum fields outside the black hole. For a particular choice of initial state, we show that the Hawking decoherence cannot counteract entanglement generation after the dynamical evolution of system, which triggers an effectively reduced uncertainty bound that violates the intrinsic limit $-\log_2c$. Numerically estimation for a proper choice of initial state shows that our result is comparable with possible real experiments. Finally, a discussion on the black hole firewall paradox in the context of entropic uncertainty relation is given.