Superposition of causal order enables perfect quantum teleportation with very noisy singlets

• Main Authors: Mukhopadhyay, Chiranjib, Pati, Arun Kumar
• Format: Journal Article
• Language: English
• Published: 22-01-2019
• Subjects: Physics - Quantum Physics
• DOI: 10.48550/arxiv.1901.07626

J.. Phys. Comm 2020 We show that the fidelity of the standard quantum teleportation protocol,
which utilizes an impure resource state, applied successively, can be
significantly improved, when used in conjunction with a quantum switch. In
particular, we find that for two such teleportation channels conjugated with
the superposition of causal order, teleportation fidelity beyond the classical
threshold is achieved for significantly larger noise than would be possible
conventionally. One can even make the effective teleportation channel perfectly
faithful for very large noise. We also discuss the generalization of our scheme
for more than two pathways, and define a figure of merit in that context.