Bounds on Quantum Information Storage and Retrieval

Understand

We present certain universal bounds on the capacity of quantum information storage and on the time scale of its retrieval for a generic quantum field theoretic system.

• The capacity, quantified by the microstate entropy, is bounded from above by the surface area of the object measured in units of a Goldstone decay constant.
• The Goldstone bosons are universally present due to the spontaneous breaking of Poincare and internal symmetries by the information-storing object.
• Applied to a black hole, the bound reproduces the Bekenstein-Hawking entropy.