Super-Additivity and Entanglement Assistance in Quantum Reading

TL;DR

This paper reviews the quantum reading capacity of a memory model, highlighting super-additivity and the conditions where entanglement enhances reading performance, thus advancing quantum information retrieval techniques.

Contribution

It characterizes the quantum reading capacity, demonstrating super-additivity and identifying when entanglement assistance improves reading efficiency.

Findings

Quantum reading capacity is super-additive.

Entanglement can improve reading performance.

Conditions for entanglement assistance effectiveness are identified.

Abstract

Quantum information theory determines the maximum rates at which information can be transmitted through physical systems described by quantum mechanics. Here we consider the communication protocol known as quantum reading. Quantum reading is a protocol for retrieving the information stored in a digital memory by using a quantum probe, e.g., shining quantum states of light to read an optical memory. In a variety of situations using a quantum probe enhances the performances of the reading protocol in terms of fidelity, data density and energy dissipation. Here we review and characterize the quantum reading capacity of a memory model, defined as the maximum rate of reliable reading. We show that, like other quantities in quantum information theory, the quantum reading capacity is super-additive. Moreover, we determine conditions under which the use of an entangled ancilla improves the performance of quantum reading.