Experimental Communication Through Superposition of Quantum Channels

• Main Authors: Pang, Arthur O. T, Lupu-Gladstein, Noah, Ferretti, Hugo, Yilmaz, Y. Batuhan, Brodutch, Aharon, Steinberg, Aephraim M
• Format: Journal Article
• Language: English
• Published: 25-09-2023
• Subjects: Physics - Quantum Physics
• DOI: 10.48550/arxiv.2302.14820

Quantum 7, 1125 (2023) Information capacity enhancement through the coherent control of channels has
attracted much attention of late, with work exploring the effect of coherent
control of channel causal orders, channel superpositions, and information
encoding. Coherently controlling channels necessitates a non-trivial expansion
of the channel description, which for superposing qubit channels, is equivalent
to expanding the channel to act on qutrits. Here we explore the nature of this
capacity enhancement for the superposition of channels by comparing the maximum
coherent information through depolarizing qubit channels and relevant
superposed and qutrit channels. We show that the expanded qutrit channel
description in itself is sufficient to explain the capacity enhancement without
any use of superposition.