Approximate Quantum Error Correction via Complementary Observables

Details Approximate Quantum Error Correction via Complementary Observables Approximate Quantum Error Correction via Complementary Observables

2010-03-04

arxiv.org/abs/1003.1150v2

Physics

Quantum Physics

4 pages. v2: included forgotten reference; changed confusing wording regarding state merging.

Scientific paper

The breakthrough of quantum error correction brought with it the picture of quantum information as a sort of combination of two complementary types of classical information, "amplitude" and "phase". Here I show how this intuition can be used to construct two new conditions for approximate quantum error correction. The first states that entanglement is locally recoverable from a bipartite state when one system can be used to approximately predict the outcomes of two complementary observables on the other. The second, more in the spirit of the recent decoupling approach, states that entanglement is locally recoverable when the environment cannot reliably predict either.

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