Experimental achievement of the entanglement assisted capacity for the depolarizing channel

TL;DR

This paper experimentally demonstrates the maximum classical information transmission capacity of a depolarizing quantum channel using entanglement, achieving the theoretical limit even with noise, by manipulating Bell states and performing Bell state analysis.

Contribution

It provides the first experimental realization of the entanglement-assisted capacity for a depolarizing channel, including in noisy conditions, confirming theoretical predictions.

Findings

Achieved maximum entanglement-assisted capacity in a depolarizing channel.

Demonstrated capacity is the highest reported in noiseless conditions.

Implemented controlled quantum noise and Bell state analysis for capacity measurement.

Abstract

We experimentally demonstrate the achievement of the entanglement assisted capacity for classical information transmission over a depolarizing channel. The implementation is based on the generation and local manipulation of 2-qubit Bell states, which are finally measured at the receiver by a complete Bell state analysis. The depolarizing channel is realized by introducing quantum noise in a controlled way on one of the two qubits. This work demonstrates the achievement of the maximum allowed amount of information that can be shared in the presence of noise and the highest reported value in the noiseless case.