Accessible Information and Quantum operations

TL;DR

This paper investigates how quantum operations affect accessible information, demonstrating fundamental limitations on the accuracy of quantum processes and the arbitrary manipulation of unknown quantum states.

Contribution

It establishes theoretical bounds on the accuracy of quantum operations and their impact on accessible information in quantum systems.

Findings

Accessible information decreases under quantum operations

Quantum processes cannot be operated with arbitrary accuracy

Unknown quantum states cannot be arbitrarily manipulated by unitary operations

Abstract

The accessible information decreases under quantum operations. We analyzed the connection between quantum operations and accessible information. We show that a general quantum process cannot be operated accurately. Futhermore, an unknown state of a closed quantum system can not be operated arbitrarily by a unitary quantum operation.