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

Abstract

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.

4+ pages, 8 figs, Comments Welcome

References in corpus (6)

• Experimental quantum teleportation
• Quantum Coherence as a Resource
• Experimental Verification of an Indefinite Causal Order
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• Indefinite Causal Order in a Quantum Switch
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• Expressibility, entangling power and quantum average causal effect for causally indefinite circuits
• To share and not share a singlet: control qubit and nonclassicality in teleportation
• Optimal quantum precision in noise estimation: Is entanglement necessary?
• Remote Creation of Quantum Coherence via Indefinite Causal Order
• Entropic uncertainty under indefinite causal order and input-output direction
• Correlations in a quantum switch-based heat engine with measurements: A proof-of-principle demonstration